Abstract
Fungal biota represents important constituents of phyllosphere microorganisms. It is taxonomically highly diverse and influences plant physiology, metabolism and health. Members of the order Diaporthales are distributed worldwide and include devastating plant pathogens as well as endophytes and saprophytes. However, many phyllosphere Diaporthales species remain uncharacterized, with studies examining their diversity needed. Here, we report on the identification of several diaporthalean taxa samples collected from diseased leaves of Cinnamomum camphora (Lauraceae), Castanopsis fordii (Fagaceae) and Schima superba (Theaceae) in Fujian province, China. Based on morphological features coupled to multigene phylogenetic analyses of the internal transcribed spacer (ITS) region, the large subunit of nuclear ribosomal RNA (LSU), the partial beta-tubulin (tub2), histone H3 (his3), DNA-directed RNA polymerase II subunit (rpb2), translation elongation factor 1-α (tef1) and calmodulin (cal) genes, three new species of Diaporthales are introduced, namely, Diaporthe wuyishanensis, Gnomoniopsis wuyishanensis and Paratubakia schimae. This study contributes to our understanding on the biodiversity of diaporthalean fungi that are inhabitants of the phyllosphere of trees native to Asia.
Keywords: Diaporthe, multigene phylogeny, new species, Paratubakia, taxonomy
1. Introduction
The various fungi that inhabit the outer surface and the inner microenvironment of plant leaves are referred to as phyllosphere fungi [1,2]. These fungi include saprophytes, pathogens, epiphytes and endophytes and can affect plant growth and/or help enhance resistances to biotic and abiotic stress [3,4]. There is significant diversity of phyllosphere fungi whose members span diverse phyla in the Fungal Kingdom, particularly within the Ascomycota and the Basidiomycota [5]. Although studies examining the diversity of fungi in different trophic levels remain limited, fungal diversity on leaves has been shown to be lower than in soil but higher than that found on flowers and fruits, with several studies focusing on entomopathogenic fungi reporting highest diversity in soil, followed by leaves, leaf litter and twigs [6,7]. However, knowledge concerning phyllosphere fungal diversity particularly within the Diaporthales remains limited.
The camphor and timber trees, Cinnamomum camphora (L.) J. Presl and Castanopsis fordii Hance, and the flowering plant, Schima superba Gardner & Champ., are widely distributed in south-eastern China, where they can be the dominant members of forest ecosystems [8,9,10]. They play important roles in stabilizing soil, reducing erosion and protecting water sources [11,12]. In addition, these trees have important economic values, with various parts of certain members of the genus Castanopsis and Cinnamomum frequently employed as part of traditional medicinal practices [11,13]. The crude extracts and chemical constituents derived from Castanopsis exhibit a wide range of biological activities, including anti-inflammatory, antioxidant, antimicrobial and other effects [11]. Cinnamic acid, eugenol and cinnamyl alcohol from Cinnamomum were the active components of cardiovascular protection [13]. The fungi that associate with Cinnamomum, Castanopsis and Schima plants play different roles, with information concerning fungal Diaporthales diversity lacking, especially from diseased leaves [14,15]. Here, we report on the isolation and characterization of new fungal species isolated from diseased leaves of Cinnamomum camphora, Castanopsis fordii and Schima superba in Fujian Province, China. Based on morphological and molecular phylogenetic analyses, we identify three new fungal species, namely Diaporthe wuyishanensis sp. nov. in Diaporthaceae, Gnomoniopsis wuyishanensis sp. nov. in Gnomoniaceae, and Paratubakia schimae sp. nov. in Tubakiaceae. Detailed descriptions and illustrations of the three new species are given. To the best of our knowledge, our data include the first identification and description of Paratubakia, (P. schimae sp. nov.) in China.
2. Materials and Methods
2.1. Specimen Sources, Isolation, Morphological Characterization and Selection
Fungal spot disease specimens found on leaves of Cinnamomum camphora, Castanopsis fordii and Schima superba were collected at Meihua Mountain National Nature Reserve, Longyan City and Wuyi Mountain National Nature Reserve, Wuyishan City in Fujian Province, China. The two sampling sites are representative areas of large Cinnamomum, Castanopsis and Schima forests, with high plant diversity, abundant precipitation and more mountains. The leaf specimens were placed in paper bags, which were labeled with the details concerning plant hosts, locations, geographical features and altitudes [16]. Specimens were taken to laboratory and treated as described in Photita et al. [17]. The fungi were isolated using a tissue separation method as follows: ~25 mm2 diseased tissue fragments were cut from leaves displaying spot symptoms. The fragments were first sterilized by soaking in 75% ethanol for 60 s and then rinsed once with sterile deionized water for 20 s. Following this, samples were placed in 5% NaOCl for 30 s and then rinsed three times with sterile deionized water for 60 s each time. Finally, fragments were dried on sterilized filter paper and then placed onto potato dextrose agar (PDA) plates for fungal outgrowth [17]. Pure colonies were obtained after sequential passage via culturing of growing fungal colony edges on PDA. Plates were incubated in a light incubator (12:12) at 25 °C. Strains were presumptively identified following three steps: firstly, each strain was sequenced with ITS and tef1 phylogenetic markers. The BLASTn searches were used to determine the most closely related taxa in the GenBank database with the ITS sequences. Secondly, the family or genus level phylogenetic analysis was conducted using ITS-tef1 sequences. For Diaporthe, strains were assigned to Diaporthe different complexes and referred to Dissanayake et al. [18]. Thirdly, amplification of other different loci and phylogenetic analyses were conducted using different multi-locus datasets. Ultimately, herbarium materials were kept at the Herbarium Mycologicum Academiae Sinicae, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China (HMAS), and living cultures were maintained in the China General Microbiological Culture Collection Center (CGMCC). Colony features were imaged with digital camera (Canon EOS 6D MarkII, Tokyo, Japan) at 7 and 15 days after inoculation in indicated media. Microstructures were observed and photographed using a stereo microscope (Nikon SMZ745, Tokyo, Japan) and biological microscope (Ni-U, Tokyo, Japan) with a digital camera (Olympus, Tokyo, Japan) using differential interference contrast (DIC) [19]. Structural measurements were measured using Digimizer 5.4.4 software (https://www.digimizer.com).
2.2. DNA Extraction, PCR Amplification and Sequencing
Fungal DNA was directly extracted from growing mycelia on PDA after 5–7 days of growth using the Fungal DNA Mini Kit (OMEGA-D3390, Feiyang Biological Engineering Co., Ltd., Guangzhou, China) according to the product manual. Nucleotide sequences corresponding to seven genetic loci were amplified by polymerase chain reaction (PCR) using a Bio-Rad Thermocycler (Hercules, CA, USA). For Diaporthe, the internal transcribed spacer (ITS) region was amplified with primers ITS5 and ITS4, the calmodulin (cal) gene with primers CAL-228F and CAL-737R, the histone H3 (his3) gene with primers CYLH3F and H3-1b, the translation elongation factor 1-α (tef1) gene with primers EF1-728F and TEF1-986R and the beta-tubulin (tub2) gene with primers Bt2a and Bt2b as described [20,21,22,23]. The same primers were used for Gnomoniopsis, with the exception of amplification of the tef1 gene, which was performed using primers EF1-728F and EF-2 [20,21,23,24]. For Paratubakia, the ITS and tub2 sequences were amplified with the primers listed above, and in addition, the LSU gene was amplified with primers LROR and LR5, the DNA-directed RNA polymerase II subunit (rpb2) gene with primers fRPB2-5F and fRPB2-7cR and the tef1 gene with primers EF1-728F and EF-2 [20,21,23,24,25,26,27]. The PCR thermal cycle program, primer pairs and sequence are listed in Table 1. The PCR reaction mixture was 25 µL, containing 12.5 μL of 2 × Spark Taq PCR Master Mix (Without Dye) (Shandong Sparkjade Biotechnology Co., Ltd., Jinan, China), 1 μL of template DNA, 1 µL each 10 µM primer (Tsingke, Fuzhou, China) and 9.5 µL of sterile water. Qualified PCR products were checked on electrophoresed in 1% agarose gel (RM19009 and RM02852, ABclonal) and were sequenced by a commercial company (Fuzhou Sunya Biotechnology Co., Ltd., Fuzhou, China).
Table 1.
Target sequences, primer pairs and PCR programs used for application in this study.
| Loci | PCR Primers | Sequence (5′–3′) | PCR Cycles | References |
|---|---|---|---|---|
| ITS | ITS5 | GGA AGT AAA AGT CGT AAC AAG G | (95 °C: 30 s, 55 °C: 30 s, 72 °C: 1 min) × 35 cycles | [20] |
| ITS4 | TCC TCC GCT TAT TGA TAT GC | |||
| LSU | LROR | GTA CCC GCT GAA CTT AAG C | (95 °C: 30 s, 52 °C: 30 s, 72 °C: 1 min) × 35 cycles | [25,26] |
| LR5 | TCC TGA GGG AAA CTT CG | |||
| cal | CAL-228F | GAG TTC AAG GAG GCC TTC TCC C | (95 °C: 30 s, 54 °C: 30 s, 72 °C: 1 min) × 35 cycles | [21] |
| CAL-737R | CAT CTT CTG GCC ATC ATG G | |||
| rpb2 | fRPB2-5F | GAY GAY MGW GAT CAY TTY GG | (95 °C: 30 s, 56 °C: 30 s, 72 °C: 1 min) × 35 cycles | [27] |
| fRPB2-7cR | CCC ATW GCY TGC TTM CCC AT | |||
| his3 | CYLH3F | AGG TCC ACT GGT GGC AAG | (95 °C: 30 s, 58 °C: 30 s, 72 °C: 1 min) × 35 cycles | [22,23] |
| H3-1b | GCG GGC GAG CTG GAT GTC CTT | |||
| tef1 | EF1-728F | CAT CGA GAA GTT CGA GAA GG | (95 °C: 30 s, 48 °C: 30 s, 72 °C: 1 min) × 35 cycles | [21,24] |
| EF-2 | GGA RGT ACC AGT SAT CAT GTT | |||
| EF1-728F | CAT CGA GAA GTT CGA GAA GG | (95 °C: 30 s, 52 °C: 30 s, 72 °C: 1 min) × 35 cycles | [21] | |
| TEF1-986R | TAC TTG AAG GAA CCC TTA CC | |||
| tub2 | Bt2a | GGT AAC CAA ATC GGT GCT GCT TTC | (95 °C: 30 s, 53 °C: 30 s, 72 °C: 1 min) × 35 cycles | [23] |
| Bt2b | ACC CTC AGT GTA GTG ACC CTT GGC |
2.3. Sequence Alignment and Phylogenetic Analysis
New sequences generated from this study were deposited in GenBank (Table 2, Table 3 and Table 4). Reference sequences were downloaded from GenBank (Table 2, Table 3 and Table 4). Sequences were aligned with MAFFT v.7 (http://mafft.cbrc.jp/alignment/server/, (accessed on 29 August 2024)) and corrected manually by MEGA 7 software [28,29]. The concatenated aligned sequences were analyzed by Maximum likelihood (ML) and Bayesian inference (BI) methods using the CIPRES Science Gateway portal (https://www.phylo.org/, accessed on (30 August 2024)) and Phylosuite software v. 1.2.3 [30,31]. The Maximum likelihood (ML) analysis was performed with 1000 rapid bootstrap replicates using the GTRGAMMA substitution model by RaxML-HPC2 on ACCESS v. 8.2.12 [32,33]. For Bayesian inference (BI) analyses, Partition Finder2 was used to select the evolutionary model for each locus [34]. Four simultaneous Markov Chain Monte Carlo (MCMC) chains were initiated from random trees with 1 million generations for the Diaporthe, 15 million generations for the Gnomoniopsis and 5 million generations for the Tubakiaceae analyses. In the tests, analyses were sampled every 100 generations. The first 25% of trees were discarded, and remaining trees were used to determine posterior probabilities (PPs). System diagrams were plotted using FigTree v. 1.4.5_pre (https://github.com/rambaut/figtree/releases (accessed on 3 September 2024)).
Table 2.
Information of specimens and GenBank accession numbers of the sequences used in the analysis of the Diaporthe virgiliae species complex.
| Species | Culture/Voucher | Host/Substrate | Locations | GenBank Accession Number | ||||
|---|---|---|---|---|---|---|---|---|
| ITS | tub2 | tef1 | cal | his3 | ||||
| Diaporthe wuyishanensis sp. nov. | CGMCC3.27490 * | Cinnamomum camphora | China | PQ385851 | PQ404036 | PQ404034 | PQ404030 | PQ404032 |
| Diaporthe wuyishanensis sp. nov. | CGMCC3.27491 | Cinnamomum camphora | China | PQ385852 | PQ404037 | PQ404035 | PQ404031 | PQ404033 |
| Diaporthe grandiflori | SAUCC194.84 * | Heterostemma grandiflorum | China | MT822612 | MT855809 | MT855924 | MT855691 | MT855580 |
| Diaporthe heterophyllae | CBS 143769 * | Acacia heterophylla | France | MG600222 | MG600226 | MG600224 | MG600218 | MG600220 |
| Diaporthe penetriteum | LC3353 * | Camellia sinensis | China | KP714505 | KP714529 | KP714517 | – | KP714493 |
| Diaporthe penetriteum | NKDL–3–19 | Citrus sinensis | China | MW202992 | MW208612 | MW221578 | MW221746 | MW221677 |
| Diaporthe shennongjiaensis | CNUCC 201905 | Juglans regia | China | MN216229 | MN227012 | MN224672 | MN224551 | MN224560 |
| Diaporthe virgiliae | CMW 40748 | Virgilia oroboides | South Africa | KP247566 | KP247575 | – | – | – |
| Diaporthe virgiliae | CMW 40752 | Virgilia oroboides | South Africa | KP247570 | KP247579 | – | – | – |
| Diaporthe virgiliae | CMW40755 * | Virgilia oroboides | South Africa | KP247573 | KP247582 | – | – | – |
| Diaporthe virgiliae | SCF 006–607 | Cyclopia subternata | South Africa | MW959685 | MW979256 | MT833892 | – | MT833906 |
| Diaporthe zaofenghuang | CGMCC3.20271 * | Prunus persica | China | MW477883 | MW480875 | MW480871 | MW480867 | MW480863 |
| Diaporthe zaofenghuang | TZFH3 | Prunus persica | China | MW477884 | MW480876 | MW480872 | MW480868 | MW480864 |
Notes: Newly generated sequences are in bold. The ex-type, ex-epitype and ex-neotype strains are marked with *.
Table 3.
Information of specimens and GenBank accession numbers of the sequences used in the analysis of Gnomoniopsis.
| Species | Culture/Voucher | Host/Substrate | Locations | GenBank Accession Number | ||
|---|---|---|---|---|---|---|
| ITS | tef1 | tub2 | ||||
| Gnomoniopsis agrimoniae | MFLUCC 14–0844 * | Agrimonia eupatoria | Italy | – | MF377585 | – |
| Gnomoniopsis agrimoniae | MFLUCC 17–1662 | Agrimonia eupatoria | Italy | – | MF377586 | – |
| Gnomoniopsis alderdunensis | CBS 125680 * | Rubus parviflorus | USA | GU320825 | GU320801 | GU320787 |
| Gnomoniopsis alderdunensis | CBS 125681 | Rubus parviflorus | USA | GU320827 | GU320802 | GU320789 |
| Gnomoniopsis alderdunensis | CBS 125679 | Rubus pedatus | USA | GU320826 | GU320813 | GU320788 |
| Gnomoniopsis angolensis | CPC 33595 = CBS 145057 * | unknown host plant | Angola | MK047428 | – | – |
| Gnomoniopsis castanopsidis | CFCC 54437 * | Castanopsis hystrix | China | MZ902909 | MZ936385 | – |
| Gnomoniopsis castanopsidis | CFCC 54438 | Castanopsis hystrix | China | MZ902910 | MZ936386 | – |
| Gnomoniopsis chamaemori | CBS 804.79 | Rubus chamaemorus | Finland | GU320817 | GU320809 | GU320777 |
| Gnomoniopsis chinensis | CFCC 52286 * | Castanea mollissima | China | MG866032 | MH545370 | MH545366 |
| Gnomoniopsis chinensis | CFCC 52288 | Castanea mollissima | China | MG866034 | MH545372 | MH545368 |
| Gnomoniopsis chinensis | CFCC 52287 | Castanea mollissima | China | MG866033 | MH545371 | MH545367 |
| Gnomoniopsis chinensis | CFCC 52289 | Castanea mollissima | China | MG866035 | MH545373 | MH545369 |
| Gnomoniopsis clavulata | CBS 121255 | Quercus falcata | USA | EU254818 | EU221934 | EU219211 |
| Gnomoniopsis comari | CBS 807.79 | Comarum palustre | Finland | EU254822 | GU320814 | GU320779 |
| Gnomoniopsis comari | CBS 809.79 | Comarum palustre | Switzerland | EU254823 | GU320794 | GU320778 |
| Gnomoniopsis comari | CBS 806.79 | Oryza sativa | UK | EU254821 | GU320810 | EU219156 |
| Gnomoniopsis daii | CFCC 54043 * | Castanea mollissima | China | MZ902911 | MZ936387 | MZ936403 |
| Gnomoniopsis daii | CFCC 55517 | Castanea mollissima | China | MN598671 | MN605519 | MN605517 |
| Gnomoniopsis daii | CMF002B | Castanea mollissima | China | MN598672 | MN605520 | MN605518 |
| Gnomoniopsis daii | CFCC 55294B | Quercus aliena | China | MZ902912 | MZ936388 | MZ936404 |
| Gnomoniopsis diaoluoshanensis | SAUCC DL0963 * | Castanopsis chinensis | China | ON753744 | ON759769 | ON759777 |
| Gnomoniopsis diaoluoshanensis | SAUCC DL0964 | Castanopsis chinensis | China | ON753743 | ON759768 | ON759776 |
| Gnomoniopsis diaoluoshanensis | SAUCC DL0961 | Castanopsis chinensis | China | ON753745 | ON759770 | ON759778 |
| Gnomoniopsis fagacearum | CFCC 54412 | Castanopsis chunii | China | MZ902917 | MZ936393 | MZ936409 |
| Gnomoniopsis fagacearum | CFCC 54414 | Castanopsis eyrei | China | MZ902915 | MZ936391 | MZ936407 |
| Gnomoniopsis fagacearum | CFCC 54288 | Castanopsis faberi | China | MZ902913 | MZ936389 | MZ936405 |
| Gnomoniopsis fagacearum | CFCC 54316 * | Lithocarpus glaber | China | MZ902916 | MZ936392 | MZ936408 |
| Gnomoniopsis fagacearum | CFCC 54439 | Quercus variabilis | China | MZ902914 | MZ936390 | MZ936406 |
| Gnomoniopsis fragariae = Gnomoniopsis fructicola | CBS 121226 | Fragaria vesca | USA | EU254824 | EU221961 | EU219144 |
| Gnomoniopsis fragariae = Gnomoniopsis fructicola | CBS 125671 | Fragaria sp. | USA | GU320816 | GU320793 | GU320776 |
| Gnomoniopsis fragariae = Gnomoniopsis fructicola | CBS 208.34 | Fragaria sp. | USA | EU254826 | EU221968 | EU219149 |
| Gnomoniopsis guangdongensis | CFCC 54443 * | Castanopsis fargesii | China | MZ902918 | MZ936394 | MZ936410 |
| Gnomoniopsis guangdongensis | CFCC 54331 | Castanopsis fargesii | China | MZ902919 | MZ936395 | MZ936411 |
| Gnomoniopsis guangdongensis | CFCC 54282 | Castanopsis fargesii | China | MZ902920 | MZ936396 | MZ936412 |
| Gnomoniopsis guttulata | MS 0312 | Agrimonia eupatoria | Bulgaria | EU254812 | – | – |
| Gnomoniopsis hainanensis | CFCC 54376 * | Castanopsis hainanensis | China | MZ902921 | MZ936397 | MZ936413 |
| Gnomoniopsis hainanensis | CFCC 55877 | Castanopsis hainanensis | China | MZ902922 | MZ936398 | MZ936414 |
| Gnomoniopsis idaeicola | CBS 125673 | Rubus pedatus | USA | GU320824 | GU320798 | GU320782 |
| Gnomoniopsis idaeicola | CBS 125675 | Rubus pedatus | USA | GU320822 | GU320799 | GU320783 |
| Gnomoniopsis idaeicola | CBS 125676 | Rubus pedatus | USA | GU320821 | GU320811 | GU320784 |
| Gnomoniopsis idaeicola | CBS 125672 | Rubus sp. | USA | GU320823 | GU320797 | GU320781 |
| Gnomoniopsis idaeicola | CBS 125674 | Rubus sp. | France | GU320820 | GU320796 | GU320780 |
| Gnomoniopsis lithocarpi | SAUCC YN0743* | Lithocarpus fohaiensis | China | ON753749 | ON759765 | ON759783 |
| Gnomoniopsis lithocarpi | SAUCC YN0742 | Lithocarpus fohaiensis | China | ON753750 | ON759764 | ON759782 |
| Gnomoniopsis macounii | CBS 121468 | Spiraea sp. | USA | EU254762 | EU221979 | EU219126 |
| Gnomoniopsis mengyinensis | SAUCC MY0293 * | Castanea mollissima | China | ON753741 | ON759766 | ON759774 |
| Gnomoniopsis mengyinensis | SAUCC MY0296 | Castanea mollissima | China | ON753742 | ON759767 | ON759775 |
| Gnomoniopsis occulta | CBS 125677 | Potentilla sp. | USA | GU320828 | GU320812 | GU320785 |
| Gnomoniopsis occulta | CBS 125678 | Potentilla sp. | USA | GU320829 | GU320800 | GU320786 |
| Gnomoniopsis paraclavulata | CBS 123202 | Quercus alba | USA | GU320830 | GU320815 | GU320775 |
| Gnomoniopsis quercicola | IRAN 4313C = CBS 149773 * | Quercus brantii | Iran | OR540614 | OR561996 | OR561907 |
| Gnomoniopsis racemula | CBS 121469 * | Triticum aestivum | USA | EU254841 | EU221889 | EU219125 |
| Gnomoniopsis rosae | CPC 34440 = CBS 145085 * | Rosa sp. | New Zealand | MK047451 | – | – |
| Gnomoniopsis rossmaniae | CFCC 54307 * | Castanopsis hainanensis | China | MZ902923 | MZ936399 | MZ936415 |
| Gnomoniopsis rossmaniae | CFCC 55876 | Castanopsis hainanensis | China | MZ902924 | MZ936400 | MZ936416 |
| Gnomoniopsis sanguisorbae | CBS 858.79 | Sanguisorba minor | Switzerland | GU320818 | GU320805 | GU320790 |
| Gnomoniopsis silvicola | CFCC 54304 | Castanopsis hystrix | China | MZ902925 | MZ936401 | MZ936417 |
| Gnomoniopsis silvicola | CFCC 54418 * | Quercus serrata | China | MZ902926 | MZ936402 | MZ936418 |
| Gnomoniopsis smithogilvyi | MUT 401 | Castanea sativa | Italy | HM142946 | KR072537 | KR072532 |
| Gnomoniopsis smithogilvyi | MUT 411 | Castanea sativa | New Zealand | HM142948 | KR072538 | KR072533 |
| Gnomoniopsis smithogilvyi | CBS 130190 * | Castanea sp. | Australia | JQ910642 | JQ910645 | JQ910639 |
| Gnomoniopsis smithogilvyi | CBS 130189 | Castanea sp. | Australia | JQ910644 | JQ910647 | JQ910641 |
| Gnomoniopsis smithogilvyi | CBS 130188 | Castanea sp. | Australia | JQ910643 | KR072536 | JQ910640 |
| Gnomoniopsis tormentillae | CBS 904.79 | Potentilla sp. | Switzerland | EU254856 | GU320795 | EU219165 |
| Gnomoniopsis wuyishanensis sp. nov. | CGMCC3.27834 | Castanopsis fordii | China | PQ381256 | PQ404016 | PQ404018 |
| Gnomoniopsis wuyishanensis sp. nov. | CGMCC3.27836 * | Castanopsis fordii | China | PQ381257 | PQ404017 | PQ404019 |
| Gnomoniopsis xunwuensis | CFCC 53115 * | Castanopsis fissa | China | MK432667 | MK578141 | MK578067 |
| Gnomoniopsis xunwuensis | CFCC 53116 | Castanopsis fissa | China | MK432668 | MK578142 | MK578068 |
| Gnomoniopsis yunnanensis | SAUCC YN1659 * | Castanea mollissima | China | ON753746 | ON759771 | ON759779 |
| Gnomoniopsis yunnanensis | SAUCC YN1657 | Castanea mollissima | China | ON753747 | ON759772 | ON759780 |
| Gnomoniopsis yunnanensis | SAUCC YN1641 | Castanea mollissima | China | ON753748 | ON759773 | ON759781 |
| Melanconis stilbostoma | CBS 109778 | Betula pendula | Australia | DQ323524 | EU221886 | EU219104 |
Notes: Newly generated sequences are in bold. The ex-type, ex-epitype and ex-neotype strains are marked with *.
Table 4.
Information of specimens and GenBank accession numbers of the sequences used in the analysis of Tubakiaceae.
| Species | Culture/Voucher | Host/Substrate | Locations | GenBank Accession Number | ||||
|---|---|---|---|---|---|---|---|---|
| ITS | LSU | tef1 | tub2 | rpb2 | ||||
| Apiognomonioides supraseptata | CBS 632.92 * | Quercus glauca | Japan | MG976447 | MG976448 | – | – | – |
| Apiognomonioides supraseptata | ATCC 58737 | Quercus glauca | Japan | – | AF277127 | – | – | – |
| Ellipsoidisporodochium photiniae | SAUCC 210421 * | Photinia serratifolia | China | OK175559 | OK189532 | OK206440 | OK206442 | OK206438 |
| Ellipsoidisporodochium photiniae | SAUCC 210423 | Photinia serratifolia | China | OK175560 | OK189533 | OK206441 | OK206443 | OK206439 |
| Greeneria uvicola | FI12007 | unknown host plant | Uruguay | HQ586009 | GQ870619 | – | – | – |
| Involutiscutellula rubra | CBS 192.71 * | Quercus phillyraeoides | Japan | MG591899 | MG591993 | MG592086 | MG592180 | MG976476 |
| Involutiscutellula rubra | MUCC 2303 | Quercus phillyraeoides | Japan | MG591900 | MG591994 | MG592087 | MG592181 | MG976477 |
| Oblongisporothyrium castanopsidis | CBS 124732 | Castanopsis cuspidata | Japan | MG591849 | MG591942 | MG592037 | MG592131 | MG976453 |
| Oblongisporothyrium castanopsidis | CBS 189.71 * | Castanopsis cuspidata | Japan | MG591850 | MG591943 | MG592038 | MG592132 | MG976454 |
| Obovoideisporodochium lithocarpi | SAUCC 0748 * | Lithocarpus fohaiensis | China | MW820279 | MW821346 | MZ996876 | MZ962157 | MZ962155 |
| Obovoideisporodochium lithocarpi | SAUCC 0745 | Lithocarpus fohaiensis | China | MW820280 | MW821347 | MZ996877 | MZ962158 | MZ962156 |
| Paratubakia schimae sp. nov. | CGMCC3.27842 * | Schima superba | China | PQ408642 | PQ408644 | PQ404020 | PQ404022 | PQ404024 |
| Paratubakia schimae sp. nov. | CGMCC3.27855 | Schima superba | China | PQ408643 | PQ408645 | PQ404021 | PQ404023 | PQ404025 |
| Paratubakia subglobosa | CBS 124733 | Quercus glauca | Japan | MG591913 | MG592008 | MG592102 | MG592194 | MG976489 |
| Paratubakia subglobosa | CBS 193.71 * | Quercus glauca | Japan | MG591914 | MG592009 | MG592103 | MG592195 | MG976490 |
| Paratubakia subglobosoides | MUCC 2293 * | Quercus glauca | Japan | MG591915 | MG592010 | MG592104 | MG592196 | MG976491 |
| Phaeotubakia lithocarpicola | CFCC 54422 * | Lithocarpus glaber | China | OP951017 | OP951015 | OQ127584 | OQ127586 | – |
| Phaeotubakia lithocarpicola | RK7CX | Lithocarpus glaber | China | OP951018 | OP951016 | OQ127585 | OQ127587 | – |
| Racheliella saprophytica | MFLUCC 12–0298 * | Syzygium cumini | Thailand | KJ021933 | KJ021935 | – | – | – |
| Racheliella wingfieldiana | CBS 143669 * | Syzigium guineense | South Africa | MG591911 | MG592006 | MG592100 | MG592192 | MG976487 |
| Saprothyrium thailandense | MFLUCC 12–0303 * | Decaying leaf | Thailand | MF190163 | MF190110 | – | – | – |
| Saprothyrium thailandense | MFLUCC 17–1672 | Decaying leaf | Thailand | MF190164 | MF190111 | – | – | – |
| Sphaerosporithyrium mexicanum | CPC 32258 | Quercus eduardi | Mexico | MG591895 | MG591989 | MG592082 | MG592176 | – |
| Sphaerosporithyrium mexicanum | CPC 33021 * | Quercus eduardi | Mexico | MG591896 | MG591990 | MG592083 | MG592177 | MG976473 |
| Tubakia americana | CBS 129014 | Quercus macrocarpa | USA | MG591873 | MG591966 | MG592058 | MG592152 | MG976449 |
| Tubakia byeongjinii | CDH040 | Quercus variabilis | Republic of Korea | OR727896 | OR727898 | OR732731 | – | – |
| Tubakia byeongjinii | CDH041 * | Quercus variabilis | Republic of Korea | OR727897 | OR727899 | OR732732 | – | – |
| Tubakia californica | CPC 31505 * | Quercus kelloggii | USA | MG591835 | MG591928 | MG592023 | MG592117 | MG976451 |
| Tubakia cyclobalanopsidis | CFCC 55979 * | Quercus glauca | China | OP114639 | – | OP254247 | OP329290 | – |
| Tubakia cyclobalanopsidis | CFCC 55973 | Quercus glauca | China | OP114640 | – | OP254248 | OP329291 | – |
| Tubakia dryina | CBS 112097 * | Quercus robur | Italy | MG591851 | MG591944 | MG592039 | MG592133 | MG976455 |
| Tubakia dryinoides | MUCC2291 | Castanea crenata | Japan | MG591877 | MG591969 | MG592062 | MG592156 | MG976460 |
| Tubakia dryinoides | MUCC2292 * | Quercus phillyraeoides | Japan | MG591878 | MG591970 | MG592063 | MG592157 | MG976461 |
| Tubakia hallii | CBS 129013 * | Quercus stellata | USA | MG591880 | MG591972 | MG592065 | MG592159 | MG976462 |
| Tubakia hallii | CBS 12901 | Quercus stellata | USA | MG591881 | MG591973 | MG592066 | MG592160 | – |
| Tubakia iowensis | CBS 129012 * | Quercus macrocarpa | USA | MG591879 | MG591971 | MG592064 | MG592158 | – |
| Tubakia japonica | ATCC 22472 * | Castanea crenata | Japan | MG591886 | MG591978 | MG592071 | MG592165 | MG976465 |
| Tubakia koreana | KCTC46072 | Quercus mongolica | Republic of Korea | KP886837 | – | – | – | – |
| Tubakia liquidambaris | CBS 139744 | Liquidambar styraciflua | USA | MG605068 | MG605077 | MG603578 | – | – |
| Tubakia lushanensis | SAUCC 1921 | Quercus palustris | China | MW784677 | MW784850 | MW842262 | MW842265 | MW842268 |
| Tubakia lushanensis | SAUCC 1923 * | Quercus palustris | China | MW784678 | MW784851 | MW842261 | MW842264 | MW842267 |
| Tubakia macnabbii | CBS 137349 * | Quercus palustris | USA | MG605069 | – | MG603579 | – | – |
| Tubakia melnikiana | CPC 32255 * | Quercus canbyi | Mexico | MG591893 | MG591987 | MG592080 | MG592174 | MG976472 |
| Tubakia oblongispora | MUCC 2295 * | Quercus serrata | Japan | MG591897 | MG591991 | MG592084 | MG592178 | MG976474 |
| Tubakia paradryinoides | MUCC 2294 * | Quercus acutissima | Japan | MG591898 | MG591992 | MG592085 | MG592179 | MG976475 |
| Tubakia quercicola | CFCC 55106 * | Quercus aliena var. acuteserrata | China | OP114635 | – | OP254243 | OP254289 | – |
| Tubakia quercicola | CFCC 54912 | Quercus aliena var. acuteserrata | China | OP114636 | – | OP254244 | OP254290 | – |
| Tubakia seoraksanensis | CBS 127490 * | Quercus mongolica | Republic of Korea | MG591907 | KP260499 | MG592094 | MG592186 | – |
| Tubakia seoraksanensis | CBS 127491 | Quercus mongolica | Republic of Korea | HM991735 | KP260500 | MG592095 | MG592187 | MG976484 |
| Tubakia sierrafriensis | CPC 33020 * | Quercus eduardi | Mexico | MG591910 | MG592005 | MG592099 | MG592191 | MG976486 |
| Tubakia suttoniana | CBS 639.93 | Quercus sp. | Italy | MG591921 | MG592016 | MG592110 | MG592202 | MG976493 |
| Tubakia tiffanyae | CBS 137345 * | Quercus rubra | USA | MG605081 | – | MG603581 | – | – |
Notes: Newly generated sequences are in bold. The ex-type, ex-epitype and ex-neotype strains are marked with *.
3. Results
3.1. Phylogenetic Analyses
For the Diaporthe virgiliae species complex, the concatenated sequences dataset for the ITS, cal, his3, tef1 and tub2 genes were analyzed. The alignment included 13 taxa with Diaporthe shennongjiaensis as the outgroup (CNUCC 201905) (Figure 1). The sequence dataset contained 2653 characters (cal: 1–468, his3: 469–936, ITS: 937–1528, tef1: 1529–1865, tub2: 1866–2653) including gaps. Of these, 2418 characters were constant, 148 variable characters were parsimony-uninformative and 87 characters were parsimony informative. The SYM + I model was proposed for ITS, and the GTR model was proposed for tef1, and the HKY + I model was proposed for cal, his3 and tub2. The topology of Bayesian analyses was almost identical to the ML tree; thus, the Bayesian tree is shown.
Figure 1.
Consensus tree of Diaporthe virgiliae species complex inferred from Bayesian inference analyses based on the combined ITS, cal, his3, tef1 and tub2 sequence dataset, with Diaporthe shennongjiaensis (CNUCC 201905) as the outgroup. The Maximum likelihood (ML) bootstrap support values and Bayesian posterior probabilities (BPPs) above 80% and 0.90 are shown at the nodes. Strains marked with “T” are ex-type, ex-epitype and ex-neotype. The isolates from this study are indicated in red.
For Gnomoniopsis phylogenetic analyses, the concatenated sequence dataset combining the ITS, tef1 and tub2 gene loci was used. The alignment included 73 taxa with Melanconis stilbostoma as the outgroup (CBS 109778) (Figure 2). The sequence dataset contained 2584 characters (ITS: 1–564, tef1: 565–1710, tub2: 1711–2584) including gaps. Of these, 1462 characters were constant, 142 variable characters were parsimony-uninformative and 980 characters were parsimony informative. The GTR + I + G model was proposed for ITS, tef1 and tub2 analysis. The topology of the Bayesian analyses was almost identical to the ML tree; thus, the Bayesian tree is shown.
Figure 2.
Consensus tree of Gnomoniopsis inferred from Bayesian inference analyses based on the combined ITS, tef1 and tub2 sequence dataset, with Melanconis stilbostoma (CBS 109778) as the outgroup. The Maximum likelihood (ML) bootstrap support values and Bayesian posterior probabilities (BPPs) above 80% and 0.90 were shown at the nodes. Strains marked with “T” are ex-type, ex-epitype and ex-neotype. The isolates from this study are indicated in red.
To infer the interspecific relationships between Paratubakia within Tubakiaceae, a dataset consisting of ITS, LSU, rpb2, tef1 and tub2 sequences was assembled and analyzed. The alignment included 52 taxa with Greeneria uvicola (FI12007) as the outgroup (Figure 3). The sequence dataset contained 3809 characters (ITS: 1–666, LSU: 667–1516, rpb2: 1517–2501, tef1: 2502–3217, tub2: 3218–3809) including gaps. Of these, 2473 characters were constant, 148 variable characters were parsimony-uninformative and 1188 characters were parsimony informative. The GTR + I + G model was proposed for ITS, LSU, rpb2 and tub2, and the HKY + I + G model was proposed for tef1 analyses. The topology of Bayesian analysis was almost identical to the ML tree; thus, the Bayesian tree is shown.
Figure 3.
Consensus tree of Tubakiaceae inferred from Bayesian inference analyses based on the combined ITS, LSU, rpb2, tef1 and tub2 sequence dataset, with Greeneria uvicola (FI12007) as the outgroup. The Maximum likelihood (ML) bootstrap support values and Bayesian posterior probabilities (BPPs) above 80% and 0.90 were shown at the nodes. Strains marked with “T” are ex-type, ex-epitype and ex-neotype. The isolates from this study are indicated in red.
3.2. Taxonomy
3.2.1. Diaporthe wuyishanensis W.B. Zhang and J.Z. Qiu, sp. nov., Figure 4
MycoBank Number: MB856022
Etymology: the epithet “wuyishanensis” refers to the locality, Wuyi Mountain National Nature Reserve.
Holotype: China: Fujian Province, Wuyi Mountain National Nature Reserve, 27°38′37.88″ N, 117°55′52.39″ E, on diseased leaves of Cinnamomum camphora, 7 September 2022, T.C. Mu, holotype HMAS 352949, ex-holotype living culture CGMCC3.27490.
Figure 4.
Diaporthe wuyishanensis (HMAS 352949). (a) Diseased leaves of Cinnamomum camphora; (b,c) surface and reverse sides of colony after 7 days on PDA (d,e) and 14 days; (f,g) conidiomata; (h) conidiogenous cells and conidia; and (i,j) alpha conidia. Scale bars: (h–j) 10 µm.
Description: Asexual morphs: Conidiomata on PDA medium, coriaceous, pycnidial, solitaryor aggregated, superfical, dark brown to black, globose to subglobose, creamy yellowish conidial droplets exuded from ostioles. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, phialidic, densely aggregated, cylindrical or clavate, straight to slightly curved, 19.7–22.4 × 1.7–2.3 μm, n = 20. Conidia septate, hyaline, smooth, cylindrical or subcylindrical, cylindric-clavate, 4.3–6.5 × 1.4–2.6 μm, mean = 5.6 × 1.9 μm, L/W ratio = 3.0, n = 30. Beta conidia, gamma conidia and sexual morph not observed.
Culture characteristics: Colonies on PDA were fluffy, and aerial mycelia were abundant, grayish in the center and white at the edge. The surface was initially white, then became pale yellow with age and reverse grayish yellow spots in the middle. Colonies on PDA covered 90 mm plates after 1 week at 25 °C, growth rate 11.8–12.5 mm/day.
Other materials examined: China: Fujian Province, Wuyi Mountain National Nature Reserve, 27°38′37.88″ N, 117°55′52.39″ E, on diseased leaves of Cinnamomum camphora, 7 September 2022, T.C. Mu, paratype HMAS 352950, ex-paratype living culture CGMCC3.27491.
Notes: In this study, multigene phylogenetic analysis showed that Diaporthe wuyishanensis (CGMCC3.27490 and CGMCC3.27491) formed an independent clade (92% ML/0.99 PP, Figure 1) with Diaporthe grandiflori [35]. However, Diaporthe wuyishanensis distinguished from Diaporthe grandiflori by ITS and tef1 loci comparison (32/552 in ITS and 19/317 in tef1). Morphologically, the alpha conidia of Diaporthe wuyishanensis are smaller than Diaporthe grandiflori (4.3–6.5 × 1.4–2.6 vs. 6.3–8.3 × 2.8–3.3 μm), and Diaporthe grandiflori produces alpha conidia and beta conidia, whereas Diaporthe wuyishanensis appears to only produce alpha conidia. Therefore, we introduce this fungus as a new species.
3.2.2. Gnomoniopsis wuyishanensis T.C. Mu and J.Z. Qiu, sp. nov., Figure 5
MycoBank Number: MB856023
Etymology: The epithet “wuyishanensis” refers to the collection site of the holotype, Wuyi Mountain National Nature Reserve.
Holotype: China: Fujian Province, Wuyi Mountain National Nature Reserve, 27°43′42.05″ N, 117°42′49.13″ E, on diseased leaves of Castanopsis fordii, 30 June 2023, T.C. Mu and Z.A. Heng, holotype HMAS 353149, ex-holotype living culture CGMCC3.27836.
Figure 5.
Gnomoniopsis wuyishanensis (HMAS 353149). (a) Diseased leaves of Castanopsis fordii; (b) surface and reverse sides of colony after 7 days on PDA (c) and 14 days; (d,e) conidiomata; (f–k) conidiogenous cells and conidia; and (l,m) conidia. Scale bars: (f–m) 10 µm.
Description: Asexual morphs: Conidiomata developed on PDA, pycnidial, solitary, black, creamy conidial droplets exuded from ostioles. Conidiophores are indistinct, frequently reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, phialidic, clavate, straight to sinuous, attenuate towards apex, 10.8–23.8 × 1.4–2.6 μm, n = 20. Conidia hyaline, smooth, aseptate, oblong to ellipsoid, subcylindrical, 5.1–8.7 × 1.4–3.0 μm, mean = 6.6 ×2.1 μm, L/W ratio = 3.2, n = 30. Sexual morph not observed.
Culture characteristics: Colonies flat with irregular margin, white aerial mycelium then becoming pale gray by age. PDA attaining 36.0–40.7 mm in diameter after 1 week at 25 °C, growth rate 5.1–5.8 mm/day. PDA attaining 77.2–80.1 mm in diameter after 2 weeks at 25 °C, growth rate 5.5–5.7 mm/day.
Other materials examined: China: Fujian Province, Wuyi Mountain National Nature Reserve, 27°43′42.05″ N, 117°42′49.13″ E, on diseased leaves of Castanopsis fordii, 30 June 2023, T.C. Mu and Z.A. Heng, paratype HMAS 353148, ex-paratype living culture CGMCC3.27834.
Notes: Gnomoniopsis wuyishanensis was isolated from diseased leaves of C. fordii from Fujian Province, China. Gnomoniopsis fagacearum (CFCC 54414) was collected from diseased leaves of Castanopsis eyrei from Fujian Province, China, by Jiang et al. [30]. Phylogenetically, Gnomoniopsis wuyishanensis forms a well-supported (83% ML/1 PP, Figure 2) clade that is close, but distinct from Gnomoniopsis guangdongensis, Gnomoniopsis lithocarpi and Gnomoniopsis silvicola [30,36]. Morphologically, the conidia of Gnomoniopsis wuyishanensis are larger than Gnomoniopsis guangdongensis, Gnomoniopsis lithocarpi and Gnomoniopsis silvicola (5.1–8.7 × 1.4–3.0 vs. 4.3–5.2 × 1.4–2.0 vs. 4.0–5.8 × 1.7–2.4 vs. 4.3–5.9 × 1.9–2.7 μm). Therefore, we introduce this taxon as a new species.
3.2.3. Paratubakia schimae T.C. Mu and J.Z. Qiu, sp. nov., Figure 6
MycoBank Number: MB856024
Etymology: The epithet “schimae” refers to the genus of the host plant on which it was collected, Schima.
Holotype: China: Fujian Province, Longyan City, Meihua Mountain National Nature Reserve, 25°39′20.91″ N, 116°55′32.01″ E, on diseased leaves of Schima superba, 14 September 2022, J.H. Chen and C.J. Yang, holotype HMAS 353150, ex-holotype living culture CGMCC3.27842.
Description: Asexual morphs: Conidiomata formed on the surface of PDA medium, pycnothyria grouped together, initially white and apricot, then became black with age. Conidiophores reduced to conidiogenous cells. Conidiogenous cells, hyaline to pale brown, smooth, thin-walled, phialidic, obclavate, 13.0–20.5 × 4.4–5.8 μm, n = 20. Conidia hyaline to slightly pigmented, smooth, solitary, globose to subglobose, with inconspicuous to conspicuous hilum, 10.6–13.7 × 9.4–11.8 μm, mean = 12.1 × 10.5 μm, L/W ratio = 1.2, n = 30. Sexual morph not observed.
Culture characteristics: Colonies flat with regular margin, aerial mycelium white. This species can produce red pigment during growth, which causes the surface and reverse sides of PDA medium to change from colorless to red. PDA attaining 37.7–40.3 mm in diameter after 1 week at 25 °C, growth rate 5.4–5.8 mm/day. PDA attaining 78.7–85.6 mm in diameter after 2 weeks at 25 °C, growth rate 5.6–6.1 mm/day.
Other materials examined: China: Fujian Province, Longyan City, Meihua Mountain National Nature Reserve, 25°39′20.91″ N, 116°55′32.01″ E, on diseased leaves of Schima superba, 14 September 2022, J.H. Chen and C.J. Yang, paratype HMAS 353151, ex-paratype living culture CGMCC3.27855.
Notes: In this study, Paratubakia schimae form a well-supported (96% ML/1 PP, Figure 3) clade that is close to Paratubakia subglobosa within Tubakiaceae trees. However, Paratubakia schimae is distinguished from Paratubakia subglobosa by ITS, tef1, tub2 and rpb2 loci (24/519 in ITS, 38/569 in tef1, 19/498 in tub2 and 20/760 in rpb2) [37]. Morphologically, the conidiogenous cells of Paratubakia schimae are larger than Paratubakia subglobosa (13.0–20.5 × 4.4–5.8 vs. 8.0–12.0 × 2.0–3.0 μm). Therefore, we introduce this fungus as a new species.
Figure 6.
Paratubakia schimae (HMAS 353150). (a) Diseased leaves of Schima superba; (b) surface and reverse sides of colony after 7 days on PDA (c) and 14 days; (d,e) conidiomata; (f–j) conidiogenous cells and conidia; and (k,l) conidia. Scale bars: (f–l) 10 µm.
4. Discussion
Studies examining fungal diversity on leaves have led to the discovery of a variety of new species and taxa that include pathogens as well as potentially beneficial epi- and endophytes [38,39,40]. Diaporthales Nannf. (phylum Ascomycota) constitutes an important order of phyllosphere fungi [41,42]. Recent advances include the description of a new family, Pyrisporaceae C.M. Tian & N. Jiang, erected based on the type genus Pyrispora C.M. Tian & N. Jiang, with Pyrispora castaneae as the type species, which was collected from leaves of the Chinese chestnut (Castanea mollissima) [43]. Also, Obovoideisporodochium Z. X. Zhang, J. W. Xia & X. G. Zhang was established with the type species Obovoideisporodochium lithocarpi isolated from leaves of Lithocarpus fohaiensis [44]. In a survey of fungi associated with plant leaves in south-western China, eight new species of Diaporthe were identified from tea (Camellia sinensis): Castanea mollissima, Chrysalidocarpus lutescens, Elaeagnus conferta, Elaeagnus pungens, Heliconia metallica, Heterostemma grandiflorum, Litchi chinensis, Machilus pingii, Melastoma malabathricum and Millettia reticulate [35].
The genus Diaporthe Nitschke (syn. Phomopsis (Sacc.) Bubák) belongs to Diaporthaceae Höhn. ex Wehm. (Diaporthales), with Diaporthe eres as the type species [45,46]. Species of Diaporthe include both plant pathogens and endophytes, typically with broad host ranges, as well as saprophytes [47]. Currently, more 1200 epithets of Diaporthe and 983 of Phomopsis have been recorded in the Index Fungorum (http://www.indexfungorum.org/; (accessed 10 September 2024)). Based on five single genetic loci, as well as multigene phylogentic analyses, the genus Diaporthe was re-structured with seven sections proposed: Betulicola, Crotalariae, Eres, Foeniculina, Psoraleae-pinnatae, Rudis and Sojae, with boundaries for 13 species and 15 species complexes [18]. The lengthy phylogenetic trees of the entire Diaporthe and data analysis were avoided, which provides mycologist and taxonomists with the convenience of focusing on specific sections, species complexes and species. Here, a new species, Diaporthe wuyishanensis, is introduced into the Diaporthe virgiliae species complex, based on both morphological differences and multi-locus (ITS, cal, his3, tef1 and tub2) molecular analyses. The Diaporthe virgiliae species complex contains five species, viz. Diaporthe grandiflori, Diaporthe heterophyllae, Diaporthe penetriteum, Diaporthe virgiliae and Diaporthe zaofenghuang, previously [18].
Gnomoniopsis Berl. is a genus in the Gnomoniaceae G. Winter (Diaporthales) with Gnomoniopsis chamaemori as the type species [48]. Gnomoniopsis was originally studied as a subgenus within Gnomonia Ces. & De Not. because of their similar morphology [49]. However, Gnomoniopsis has been separated from Gnomonia by means of morphology, phylogeny and host associations [36,48,49]. As important pathogens of agricultural and forestry trees, flowers and fruit, species of Gnomoniopsis can cause signficant plant damage and resultant economic losses [50,51,52,53]. It is reported that leaf spot diseases of oak (Quercus alba and Quercus rubra) have also been caused by Gnomoniopsis clavulata infection in North America [54], and Gnomoniopsis fragariae is reported to result in leaf blotch disease of strawberry in Europe [52]. Within the past 10–12 years, Gnomoniopsis smithogilvyi has been isolated from diseased chestnut in Spain, Portugal and Greece, which are important chestnut-producing countries in Europe [55,56]. Gnomoniopsis castaneae infection damages the fruit of chestnuts and can cause cankers and necrosis on leaves. Cankers have also been reported on chestnut wood, red oak and hazelnut trees and are currently considered major threats to global chestnut production, potentially threatening the reintroduction of American chestnut, as the fungus has been found in North America [57].
With respect to host plants, Gnomoniopsis appears to mainly inhabit three plant families, viz. Rosaceae, Fagaceae and Onagraceae [49,58]. This is reflected in phylogram plant host analyses, in which Gnomoniopsis divides into three clades: Rosaceousclade, Fagaceousclade and Onagraceousclade, with most species currently assigned within the former two clades. Species of Gnomoniopsis have host-specific features in each clade, although the molecular basis for this specificity remains unknown. The new species we report, Gnomoniopsis wuyishanensis, fits within the Fagaceous clade. These characterizations and placements allow for surveillance of potential outbreaks in relevant hosts.
The genus Paratubakia U. Braun & C. Nakash. belongs to Tubakiaceae U. Braun, J.Z. Groenew. & Crous (Diaporthales) with Paratubakia subglobosa as the type species [37]. Based on morphological and phylogenetic analyses, Phaeotubakia (type species: Phaeotubakia lithocarpicola) has more recently been proposed. Based on a multigene phylogeny (LSU and rpb2), Paratubakia subglobosa and Paratubakia subglobosoides have been shown to form an independent branch of Tubakiaceae. Currently, Paratubakia includes only two species: Paratubakia subglobosa and Paratubakia subglobosoides. Tubakiaceae has been proposed to accommodate the genera Apiognomonioides, Involutscutellula, Oblongisporothyrium, Paratubakia, Racheliella, Saprothyrium, Sphaerosporithyrium and Tubakia based on LSU sequence alignment and type genus Tubakia [37]. Subsequently, Obovoideisporodochium was established based on the type species Obovoideisporodochium lithocarpi [44], and Ellipsoidisporodochium was erected based on the type species Ellipsoidisporodochium photiniae [59]. Both Obovoideisporodochium lithocarpi and Phaeotubakia lithocarpicola and most Tubakiaceae species were found from Fagaceae plants [60]. Species of Paratubakia were only found and described from the Japanese blue oak (Quercus glauca) [37]. Here, we report on a new species Paratubakia schimae, with, to the best of our knowledge, the genus found and described in China for the first time. As this is the first description of Paratubakia in China, its distribution and potential host range remain unknown. However, our data suggest significant likelihood for additional discovery.
5. Conclusions
In this study, based on morphological features and multigene phylogenetic analyses, we described three new species of Diaporthales distributed within three different genera from China, viz. Diaporthe wuyishanensis, Gnomoniopsis wuyishanensis and Paratubakia schimae. These studies reveal a high diversity of phyllosphere fungi and help plant pathologists, taxonomists and phytologists to improve understanding of plant–fungal interactions.
Acknowledgments
We are deeply indebted to Weibin Zhang, Jinhui Chen, Chenjie Yang and Sen Liu, who helped us with collecting samples, taking pictures and providing us with multigene sequence data of some new species.
Author Contributions
Conceptualization, X.G., T.M. and J.Q.; methodology, J.S.; software, Y.M.; validation, J.Y., M.Z. (Mengjia Zhu) and L.Y.; formal analysis, H.P. and Y.L.; investigation, M.Z. (Minhai Zheng); resources, H.L. (Huajun Lv) and Z.H.; data curation, X.G., T.M., J.S., Y.M., J.Y., M.Z. (Minhai Zheng), L.Y., H.P., Y.L., Z.H., H.L. (Huiling Liang), L.F., X.M., H.M. and Z.Q.; writing—original draft preparation, X.G. and T.M.; writing—review and editing, J.Q. and N.O.K.; visualization, Z.Q. and T.M.; supervision, X.G. and J.Q.; project administration, Z.Q. and J.Q.; funding acquisition, X.G. and J.Q. All authors have read and agreed to the published version of the manuscript.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
All sequences generated in this study were submitted to the NCBI database.
Conflicts of Interest
The authors declare no conflicts of interest.
Funding Statement
This research was funded by the National Natural Science Foundation of China (No. 32270029, U1803232, 31670026), the National Key R & D Program of China (No. 2017YFE0122000), a Social Service Team Support Program Project (No. 11899170165), Science and Technology Innovation Special Fund (Nos. KFB23084, CXZX2019059S, CXZX2019060G) of Fujian Agriculture and Forestry University, a Fujian Provincial Major Science and Technology Project (No. 2022NZ029017), an Investigation and evaluation of biodiversity in the Jiulong River Basin (No. 082·23259-15), Macrofungal and microbial resource investigation project in Longqishan Nature Reserve (No. SMLH2024 (TP)-JL003#) and an Investigation of macrofungal diversity in Junzifeng National Nature Reserve, Fujian Province (No. Min QianyuSanming Recruitment 2024-23).
Footnotes
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
All sequences generated in this study were submitted to the NCBI database.






