Abstract
The fungal genus Phyllosticta has been reported from all around the world and accommodates numerous pathogenic and endophytic species isolated from a wide range of plant hosts. Based on multilocus phylogenies from a combined dataset of genes encoding internal transcribed spacer (ITS), large subunit of ribosomal RNA (LSU rDNA), translation elongation factor 1 alpha (TEF1α), actin (ACT) and glycerol-3-phosphate dehydrogenase (GPDH), in conjunction with morphological characteristics, we describe two new species P.oblongifoliaesp. nov. and P.pterospermisp. nov., as well as a new Chinese record P.capitalensis. Their similarity and dissimilarity to morphologically-allied and phylogenetically-related species are also annotated and discussed.
Keywords: multigene phylogeny, new species, taxonomy
Introduction
Phyllosticta Pers. was introduced by Persoon (1818) and P.convallariae Pers. was designated as the type species (Donk 1968). Since Phyllosticta is distinct from other genera in that family, Seaver (1922) treated it in the family Phyllostictaceae Fr. of the order Phyllostictites. Nevertheless, Phyllosticta was accommodated in the family Botryosphaeriaceae Theiss. & Syd. (in Botryosphaeriales C.L. Schoch et al.) in several major studies (e.g. Crous et al. 2006; Schoch et al. 2006; Liu et al. 2012). However, the phylogenetic analyses by Wikee et al. (2013a) allocated Phyllosticta in a clade sister to Botryosphaeriaceae. As a result, the genus is currently accepted in the family Phyllostictaceae, in the order Botryosphaeriales.
A total of 3,213 names are documented for Phyllosticta in the Index Fungorum (accessed on 31 March 2022) (Hongsanan et al. 2020; Wijayawardene et al. 2020). However, many of these names have been synonymised (van der Aa and Vanev 2002). Currently, 1499 species are accepted in the genus (Bánki et al. 2022). The majority of the Phyllosticta species are known to infect a broad range of hosts and cause plant diseases, such as leaf and fruit spots (Wikee et al. 2013a; Zhou et al. 2015; Lin et al. 2017). Van der Aa (1973) revised this genus and established his own morphological criteria, i.e. aseptate pycnidia and hyaline conidia that are usually covered by a mucoid layer and bear a single apical appendage. According to these criteria, van der Aa and Vanev (2002) re-classified Phyllosticta and accepted 190 species. Other species were recombined into Asteromella Pass. & Thüm., Diaporthe Fuckel, Guignardia Viala & Ravaz, Leptodothiorella Höhn. and Phoma Sacc. A rare tropical species from the Brazilian Cerrado, P.xylopiae-sericeae Furlan. & Dianese, although morphologically well documented (Furlanetto and Dianese 1998), remains to be molecularly characterised. Recently, DNA sequencing of orthologous genes has greatly improved our knowledge of fungal phylogeny. Since van der Aa and Vanev (2002), several studies have shown that phylogenetic analyses can help delineate species in Phyllosticta (Baayen et al. 2002; Wulandari et al. 2009; Glienke et al. 2011; Wikee et al. 2011). More recently, new species of Phyllosticta have been increasingly described, based on a combination of molecular data and morphological features (Su and Cai 2012; Wang et al. 2012, 2013; Wong et al. 2012; Zhang et al. 2012, 2013; Wikee et al. 2013a; Wulandari et al. 2013; Crous et al. 2014, 2015, 2016, 2017, 2018, 2019, 2021; Zhou et al. 2015; Guarnaccia et al. 2017; Lin et al. 2017; Hattori et al. 2020; Norphanphoun et al. 2020). Norphanphoun et al. (2020) assembled all species denoted as Phyllosticta in GenBank, analysing a comprehensive dataset of five loci and consequently proposing six species complexes, viz. P.capitalensis species complex, P.concentrica species complex, P.cruenta species complex, P.owaniana species complex, P.rhodorae species complex and P.vaccinii species complex.
Hainan Province (18°10'–20°10'N, 108°37'–111°05'E) is an island in southern China, with an annual mean temperature of 22–27 °C and an annual precipitation of 1000–2600 mm. Bawangling National Forest Park is located in the southwest of Hainan, with a typical tropical rainforest climate. Fungi associated with leaf spots were collected from Rhapisexcelsa, Garciniaoblongifolia and Pterospermumheterophyllum. Using sequences of five gene loci, which include the internal transcribed spacer of ribosomal RNA (ITS rDNA), large subunit of ribosomal RNA (LSU rDNA), translation elongation factor 1 alpha (TEF1α), actin (ACT) and glycerol-3-phosphate dehydrogenase (GPDH). We also incorporated their morphology and then identified these fungi as three species of the P.capitalensis species complex, including two new species, as well as a species new to China, based on morphology and phylogenetic analyses.
Materials and methods
Isolation and morphological studies
Leaves of Rhapisexcelsa, Garciniaoblongifolia and Pterospermumheterophyllum showing necrotic spots were collected at the Bawangling National Forest Park, Hainan Province, China. Isolates were obtained using a tissue isolation method (Jiang et al. 2021). Fragments (5 × 5 mm) were taken from the margin of leaf lesions, surface-sterilised by immersing consecutively in 75% ethanol solution for 1 min, 5% sodium hypochlorite solution for 30 s and then rinsed in sterile distilled water for 1 min (Jiang et al. 2021). The sterilised fragments were dried with sterilised paper towels and placed on potato dextrose agar (PDA: 200 g potato, 20 g dextrose, 20 g agar, 1000 ml distilled water, pH 7.0) and incubated at 25 °C for 2–4 days. Subsequently, portions of agar with fungal mycelium from the periphery of the colonies were transferred into new PDA plates and photographed on the 7th and 15th days by a digital camera (Canon Powershot G7X). An inoculum of the purified colonies was placed on 2% malt extract agar (MEA:20 g malt extract, 20 g soy peptone, 15 g agar, 1000 ml distilled water, pH 5.6) and incubated under continuous near-UV light at room temperature to promote sporulation (Braun et al. 2018). Micromorphological characters were observed using an Olympus SZX10 stereomicroscope and Olympus BX53 microscope, all fitted with an Olympus DP80 high-definition colour digital camera to photo-document fungal structures. All fungal strains were stored in 10% sterilised glycerine at 4 °C for further studies. Structural measurements were taken using the Digimizer software (https://www.digimizer.com/), with thirty measurements taken for each character. The holotype specimens were deposited in the Herbarium of Plant Pathology, Shandong Agricultural University (HSAUP). Ex-holotype living cultures were deposited in the Shandong Agricultural University Culture Collection (SAUCC). Taxonomic information of the new taxa was submitted to MycoBank (http://www.mycobank.org).
DNA extraction and sequencing
Genomic DNA was extracted from fungal mycelia grown on PDA, using a modified cetyltrimethylammonium bromide (CTAB) protocol as described in Guo et al. (2000). The internal transcribed spacer region (ITS) with intervening 5.8S rRNA gene, large subunit of rRNA gene (LSU), translation elongation factor 1-alpha gene (tef1), actin gene (ACT) and glyceraldehyde-3-phosphate dehydrogenase gene (GPDH) were amplified and sequenced by using the primer pairs ITS5/ITS4 (White et al. 1990), LROR/LR5 (White et al. 1990), EF1-728F/EF2 (O’Donnell et al. 1998; Carbone and Kohn 1999), ACT-512F/ACT-783R (Carbone and Kohn 1999) and Gpd1-LM/Gpd2-LM (Myllys et al. 2002), respectively.
PCR was performed using an Eppendorf Master Thermocycler (Hamburg, Germany). Amplification reactions were carried out in a 25 μl reaction volume, which contained 12.5 μl 2×Green Taq Mix (Vazyme, Nanjing, China), 1 μl of each forward and reverse primer (10 μM stock; Biosune, Shanghai, China), 1 μl template genomic DNA (approximately 10 ng/μl) and 9.5 μl distilled deionised water. PCR parameters were as follows: 94 °C for 5 min; 35 cycles of denaturation at 94 °C for 30 s, annealing at a suitable temperature for 50 s and extension at 72 °C for 1 min; and a final elongation step at 72 °C for 10 min. The suitable annealing temperatures for the genes were 55 °C for ITS, 51 °C for LSU, 52 °C for ACT, 48 °C for tef1 and 52 °C for GPDH, respectively. PCR products were checked through a 1% agarose gel electrophoresis, stained with GelRed and visualised by a UV light. Sequencing was performed bi-directionally by Biosune Company Limited (Shanghai, China). Consensus sequences were obtained using MEGA v. 7.0 (Kumar et al. 2016). All sequences generated in this study were deposited in GenBank (Table 1).
Table 1.
Species1 | Voucher2 | Host/Substrate | Country | GenBank accession number | ||||
---|---|---|---|---|---|---|---|---|
ITS | LSU | tef1 | ACT | GPDH | ||||
Phyllostictaacaciigena | CPC 28295 * | Acaciasuaveolens | Australia | KY173433 | KY173523 | ‒ | KY173570 | ‒ |
P.aloeicola | CPC 21020 * | Aloeferox | South Africa | KF154280 | KF206214 | KF289193 | KF289311 | KF289124 |
CPC 21021 | Aloeferox | South Africa | KF154281 | KF206213 | KF289194 | KF289312 | KF289125 | |
P.ardisiicola | NBRC 102261 * | Ardisiacrenata | Japan | AB454274 | AB454274 | ‒ | AB704216 | ‒ |
P.aristolochiicola | BRIP 53316 * | Aristolochiaacuminata | Australia | JX486129 | ‒ | ‒ | ‒ | ‒ |
P.azevinhi | MUCC0088 | Ilexpedunculosa | Japan | AB454302 | AB454302 | ‒ | AB704226 | ‒ |
P.beaumarisii | CBS 535.87 | Muehlenbekiaadpressa | Australia | AY042927 | KF306229 | KF289170 | KF306232 | KF289074 |
P.brazillianiae | LGMF 330 * | Mangiferaindica | Brazil | JF343572 | KF206217 | JF343593 | JF343656 | JF343758 |
LGMF 333 | Mangiferaindica | Brazil | JF343574 | KF206216 | JF343595 | JF343658 | JF343760 | |
P.camelliae | MUCC0059 | Camelliajaponica | Japan | AB454290 | AB454290 | AB704223 | ||
P.capitalensis | CBS 128856 * | Stanhopeagraveolens | Brazil | JF261465 | KF206255 | JF261507 | KF289289 | JF343776 |
CBS 226.77 | Baccaurearamiflora | Brazil | FJ538336 | KF206289 | FJ538394 | FJ538452 | JF343718 | |
CBS 356.52 | Paphiopedilumcallosum | Germany | FJ538342 | KF206300 | FJ538400 | FJ538458 | KF289087 | |
CBS 100175 | Ilex sp. | Not given | FJ538320 | KF206327 | FJ538378 | FJ538436 | JF343699 | |
CBS 101228 | Citrus sp. | Brazil | FJ538319 | KF206325 | FJ538377 | FJ538435 | KF289086 | |
CBS 114751 | Nepheliumlappaceum | Hawaii | EU167584 | EU167584 | FJ538407 | FJ538465 | KF289088 | |
CBS 115047 | Vaccinium sp. | New Zealand | FJ538323 | KF206318 | FJ538381 | FJ538439 | KF289077 | |
CBS 115049 | Aspidospermapolyneuron | Brazil | FJ538324 | KF206317 | FJ538382 | FJ538440 | KF289084 | |
CBS 117118 | Bowdichianitida | Brazil | FJ538339 | JQ743603 | FJ538397 | FJ538455 | KF289090 | |
CBS 120428 | Musaacuminata | Indonesia | JN692544 | KF206315 | JN692532 | JN692520 | JN692509 | |
CBS 123373 | Sansevieria sp. | Netherlands | FJ538341 | JQ743604 | FJ538399 | FJ538457 | JF343703 | |
CPC 13987 | Protearepens | Portugal | KF206183 | KF206281 | KF289176 | KF289263 | KF289083 | |
CPC 16592 | Citruslimon | Argentina | KF206187 | KF206270 | KF289273 | KF289178 | KF289092 | |
CPC 17468 | Cymbidium sp. | Brazil | KF206188 | KF206259 | KF289189 | KF289284 | KF289120 | |
CPC 20256 | Ophiopogonjaponicus | Thailand | KC291337 | KF206247 | KC342557 | KC342534 | KF289089 | |
CPC 20257 | Ficusbenjamina | Thailand | KC291338 | KF206246 | KC342558 | KC342535 | KF289099 | |
LGMF219 | Citrussinensis | Brazil | KF206202 | KF206220 | JF261490 | KF289306 | JF343737 | |
LGMF220 | Citrussinensis | Brazil | KF206203 | KF206219 | JF261488 | KF289307 | JF343735 | |
LGMF222 | Citrussinensis | Brazil | KF206204 | KF206218 | JF261492 | KF289308 | JF343739 | |
SAUCC210144 | Rhapisexcelsa | China | OM571175 | OM571179 | OM640045 | OM640047 | OM640049 | |
SAUCC210148 | Rhapisexcelsa | China | OM571176 | OM571180 | OM640046 | OM640048 | OM640050 | |
P.carochlae | CGMCC 3.17317 * | Caryotaochlandra | China | KJ847422 | ‒ | KJ847444 | KJ847430 | KJ847438 |
CGMCC 3.17318 | Caryotaochlandra | China | KJ847423 | ‒ | KJ847445 | KJ847431 | KJ847439 | |
P.cavendishii | BRIP 554196 * | Musa cv. Formosana | Taiwan | JQ743562 | ‒ | KF009743 | KF014080 | ‒ |
BRIP 58008 | Banana | Australia | KC988365 | ‒ | KF009742 | KF014071 | ‒ | |
P.cordylinophila | CPC 20261 * | Cordylinefruticosa | Thailand | KF170287 | KF206242 | KF289172 | KF289295 | KF289076 |
CPC 20277 | Cordylinefruticosa | Thailand | KF170288 | KF206228 | KF289171 | KF289301 | KF289075 | |
P.eugeniae | CBS 445.82 | Eugeniaaromatica | Indonesia | AY042926 | KF206288 | KF289208 | KF289246 | KF289139 |
P.fallopiae | MUCC0113 * | Fallopiajaponica | Japan | AB454307 | AB454307 | ‒ | ‒ | ‒ |
P.harai | MUCC0043 | Aucubajaponica | Japan | AB454281 | AB454281 | ‒ | AB704219 | ‒ |
P.hubeiensis | CGMCC 3.14986 * | Viburnumodoratissimim | China | JX025037 | ‒ | JX025042 | JX025032 | JX025027 |
CGMCC 3.14987 | Viburnumodoratissimim | China | JX025038 | ‒ | JX025043 | JX025033 | JX025028 | |
P.ilicis-aquifolii | CGMCC 3.14358 * | Ilexaquifolium | China | JN692538 | ‒ | JN692526 | JN692514 | ‒ |
CGMCC 3.14359 | Ilexaquifolium | China | JN692539 | ‒ | JN692527 | JN692515 | ‒ | |
P.maculata | CPC 18347 * | Musa cv. Goly-goly pot-pot | Australia | JQ743570 | ‒ | KF009700 | KF014016 | ‒ |
BRIP 46622 | Musa cv. Goly-goly pot-pot | Australia | JQ743567 | ‒ | KF009692 | KF014013 | ‒ | |
P.mangiferae | IMI 260.576 * | Mangiferaindica | India | JF261459 | KF206222 | JF261501 | JF343641 | JF343748 |
CPC 20260 | Arecaceae | Thailand | KF206193 | KF206243 | KF289187 | KF289294 | KF289114 | |
P.mangifera-indica | MFLUCC 10–0029 * | Mangiferaindica | Thailand | KF170305 | KF206240 | KF289190 | KF289296 | KF289121 |
P.miurae | MUCC0065 | Linderapraecox | Japan | AB454291 | AB454291 | ‒ | AB704224 | ‒ |
P.musaechinensis | GZAAS6.1247 | Musa. sp. | China | KF955294 | ‒ | KM816639 | KM816627 | KM816633 |
GZAAS6.1384 | Musa. sp. | China | KF955295 | ‒ | KM816640 | KM816628 | KM816634 | |
P.musarum | BRIP57803 | Musa. sp. | Malaysia | JX997138 | ‒ | KF009737 | KF014055 | ‒ |
BRIP58028 | Musa. sp. | Australia | KC988377 | ‒ | KF009738 | KF014054 | ‒ | |
P.oblongifolae | SAUCC210055 | Garciniaoblongifolia | China | OM248442 | OM232085 | OM273890 | OM273894 | OM273898 |
SAUCC210054 | Garciniaoblongifolia | China | OM248443 | OM232086 | OM273891 | OM273895 | OM273899 | |
SAUCC210053 | Garciniaoblongifolia | China | OM248444 | OM232087 | OM273892 | OM273896 | OM273900 | |
SAUCC210052 * | Garciniaoblongifolia | China | OM248445 | OM232088 | OM273893 | OM273897 | OM273901 | |
P.paracapitalensis | CPC 26517 * | Citrusfloridana | Italy | KY855622 | KY855796 | KY855951 | KY855677 | KY855735 |
CPC 26518 | Citrusfloridana | Italy | KY855623 | KY855797 | KY855952 | KY855678 | KY855736 | |
CPC 26700 | Citrusfloridana | Italy | KY855624 | KY855798 | KY855953 | KY855679 | KY855737 | |
CPC 26701 | Citrusfloridana | Italy | KY855625 | KY855799 | KY855954 | KY855680 | KY855738 | |
CPC 26805 | Citrusfloridana | Italy | KY855626 | KY855800 | KY855955 | KY855681 | KY855739 | |
CPC 26806 | Citrusfloridana | Italy | KY855627 | KY855801 | KY855956 | KY855682 | KY855740 | |
CPC 28120 | Citruslimon | Spain | KY855628 | KY855802 | KY855957 | KY855683 | KY855741 | |
P.paracapitalensis | CPC 28121 | Citruslimon | Spain | KY855629 | KY855803 | KY855958 | KY855684 | KY855742 |
CPC 28122 | Citruslimon | Spain | KY855630 | KY855804 | KY855959 | KY855685 | KY855743 | |
CPC 28123 | Citruslimon | Spain | KY855631 | KY855805 | KY855960 | KY855686 | KY855744 | |
CPC 28127 | Citruslimon | Spain | KY855632 | KY855806 | KY855961 | KY855687 | KY855745 | |
CPC 28128 | Citruslimon | Spain | KY855633 | KY855807 | KY855962 | KY855688 | KY855746 | |
CPC 28129 | Citruslimon | Spain | KY855634 | KY855808 | KY855963 | KY855689 | KY855747 | |
P.parthenocissi | CBS 111645 * | Parthenocissusquinquefolia | USA | EU683672 | ‒ | JN692530 | JN692518 | ‒ |
P.partricuspidatae | NBRC 9466 * | Parthenocissustricuspidata | Japan | KJ847424 | ‒ | KJ847446 | KJ847432 | KJ847440 |
NBRC 9757 | Parthenocissustricuspidata | Japan | KJ847425 | ‒ | KJ847447 | KJ847433 | KJ847441 | |
P.philoprina | CBS 587.69 | Ilexaquifolium | Spain | KF154278 | KF206297 | KF289206 | KF289250 | KF289137 |
CBS 616.72 | Ilexaquifolium | Germany | KF154279 | KF206296 | KF289205 | KF289251 | KF289136 | |
P.pterospermi | SAUCC210104 * | Pterospermumheterophyllum | China | OM249954 | OM249956 | OM273902 | OM273904 | OM273906 |
SAUCC210406 | Pterospermumheterophyllum | China | OM249955 | OM249957 | OM273903 | OM273905 | OM273907 | |
P.rhizophorae | NCYUCC 19–0352 * | Rhizophorastylosa | Taiwan | MT360030 | MT360039 | ‒ | MT363248 | MT363250 |
NCYUCC 19–0358 | Rhizophorastylosa | Taiwan | MT360031 | MT360040 | ‒ | MT363249 | MT363251 | |
P.schimae | CGMCC 3.14354 * | Schimasuperba | China | JN692534 | ‒ | JN692522 | JN692510 | JN692506 |
P.schimicola | CGMCC 3.17319 * | Schimasuperba | China | KJ847426 | ‒ | KJ847448 | KJ847434 | KJ854895 |
CGMCC 3.17320 | Schimasuperba | China | KJ847427 | ‒ | KJ847449 | KJ847435 | KJ854896 | |
P.styracicola | LC1642 * | Styraxgradiflorus | China | JX025040 | ‒ | JX025045 | JX025035 | JX025030 |
P.vitis-rotundifoliae | CGMCC 3.17321 | Vitisrotundifolia | USA | KJ847429 | ‒ | KJ847451 | KJ847437 | KJ847443 |
CGMCC 3.17322 * | Vitisrotundifolia | USA | KJ847428 | ‒ | KJ847450 | KJ847436 | KJ847442 |
1Newly generated sequences in this study are in bold. 2Isolates marked with “*” are ex-type or ex-epitype strains.
Phylogenetic analyses
The generated consensus sequences were subjected to BLAST searches to identify closely-related sequences in the NCBI’s GenBank nucleotide database (Zhang et al. 2000). For phylogenetic inferences, based on ITS-LSU-tef1-ACT-GPDH sequences, a subset of sequences from the alignments of Norphanphoun et al. (2020) was used as the backbone. Newly-generated sequences in this study were aligned with related sequences retrieved from GenBank (Table 1) using MAFFT 7 online tool with the Auto strategy (Katoh et al. 2019; http://mafft.cbrc.jp/alignment/server/). To establish the identity of the isolates at species level, phylogenetic analyses were first performed for each locus individually and then all loci were concatenated together for a unified analysis (ITS-LSU-tef1-ACT-GPDH).
Phylogenetic analyses were carried out with Maximum Likelihood (ML) and Bayesian Inference (BI) algorithms. The best evolutionary model for each partition was determined using MrModelTest v. 2.3 (Nylander 2004) and incorporated into the BI analyses. ML and BI run on the CIPRES Science Gateway portal (https://www.phylo.org/; Miller et al. 2012) using RAxML-HPC2 on XSEDE v. 8.2.12 (Stamatakis 2014) and MrBayes on XSEDE v. 3.2.7a (Huelsenbeck and Ronquist 2001; Ronquist and Huelsenbeck 2003; Ronquist et al. 2012), respectively. Default parameters were used for the ML analyses and the rapid bootstrapping with the automatic halt option was set for the BI analyses. Bayesian Inference included four parallel runs of 10,000,000 generations, with the stop rule option and a sampling frequency of 1,000 generations. Burn-in fraction was set to 0.25 and posterior probabilities (PP) were determined from the remaining trees. All resultant trees were plotted using FigTree v. 1.4.4 (http://tree.bio.ed.ac.uk/software/figtree) and the layout of the trees was edited in Adobe Illustrator CC 2019.
Results
Phylogenetic analyses
A total of 86 isolates representing the Phyllosticta species were phylogenetically analysed, of which 84 isolates in the P.capitalensis species complex were considered as ingroup and two strains of Phyllostictahubeiensis (CGMCC 3.14986, CGMCC 3.14987) in the P.cruenta species complex were used as outgroup. The final alignment contained 2665 concatenated characters, viz. 1–733 (ITS), 734–1499 (LSU), 1500–1790 (tef1), 1791–2042 (ACT), 2043–2665 (GPDH). Of these characters, 1964 were constant, 126 were variable and parsimony-uninformative and 575 were parsimony-informative. MrModelTest recommended that the Bayesian Inference should use Dirichlet base frequencies for the ITS, LSU, tef1, ACT and GPDH data partitions. The GTR+I+G model was proposed for ITS, LSU and GPDH, while HKY+G for tef1 and ACT. The MCMC analysis of the five concatenated genes was run for 1,520,000 generations, resulting in 30,402 trees. The initial 7,600 trees generated in the burn-in phase were discarded, while the remaining trees were used to calculate posterior probabilities in the majority rule consensus trees. The alignment contained a total of 876 unique site patterns (ITS: 358, LSU: 69, tef1: 170, ACT: 137, GPDH: 142). The topology of the ML tree confirmed the tree topology obtained from the Bayesian Inference and, therefore, only the ML tree is presented (Fig. 1). The 86 strains were assigned to 34 species, based on the five-gene phylogeny (Fig. 1). The present study revealed three species, viz. Phyllostictaoblongifolae sp. nov., P.pterospermi sp. nov. and P.capitalensis. The P.oblongifolae sp. nov. was a sister group to P.eugeniae (0.98/81) and the P.pterospermi sp. nov. was closely related to P.mangiferae (0.99/92).
Taxonomy
The taxa described belong in family Phyllostictaceae.
. Phyllosticta oblongifoliae
Z.X. Zhang, X.Y. Liu, Z. Meng & X.G. Zhang sp. nov.
CAC8EE11-40B5-55FF-9260-B396E6E58C74
843232
Etymology.
The specific epithet “oblongifoliae” refers to the host plant Garciniaoblongifolia.
Type.
China, Hainan Province: Bawangling National Forest Park, on diseased leaves of Garciniaoblongifolia, 19 May 2021, Z.X. Zhang (holotype, HSAUP210052; ex-type SAUCC210052).
Description.
Leaf endogenic and associated with leaf spots. Asexual morph: Conidiomata pycnidial, mostly aggregated in clusters, black, erumpent. In MEA culture exuding colourless to opaque conidial masses within 10 days or longer. Pycnidial wall multilayered, textura angularis, brown to dark brown, up to 30 μm thick; inner walls hyaline. Conidiophores indistinct, often reduced to conidiogenous cells. Conidiogenous cells terminal, subcylindrical, ampulliform, hyaline, smooth, 9.0–14.0 × 2.5–4.5 μm. Conidia 8.0–13.0 × 6.0–8.0 μm, mean ± SD = 10.0 ± 1.3 × 7.2 ± 0.5 μm, hyaline, aseptate, thin and smooth walled, coarsely guttulate or with a single large central guttule, ovoid, ampulliform, ellipsoidal to subglobose, enclosed in a thin mucoid sheath, 1.0–2.0 μm thick and bearing a hyaline, apical mucoid appendage, 3.0–8.5 × 1.0–1.5 μm, flexible, unbranched, tapering towards an acutely rounded tip.
Culture characteristics
. Colonies on PDA occupying an entire 90 mm Petri dish in 14 days at 25 °C in darkness, with a growth rate of 6.0–6.5 mm/day, greenish-black in obverse and reverse. Colonies on MEA 82–86 mm in diameter after 14 days at 25 °C in darkness, with a growth rate of 5.7–6.2 mm/day, undulate at edge, white to grey white in obverse and reverse, with moderate aerial mycelia on the surface, with black, gregarious conidiomata.
Additional specimens examined.
China, Hainan Province: Bawangling National Forest Park, on diseased leaves of Garciniaoblongifolia, 19 May 2021, Z.X. Zhang, HSAUP210053, living culture SAUCC210053; on diseased leaves of Garciniaoblongifolia, 19 May 2021, Z.X. Zhang, paratype HSAUP210054, ex-paratype living culture SAUCC210054; on diseased leaves of Garciniaoblongifolia, 19 May 2021, Z.X. Zhang, paratype HSAUP210055, ex-paratype living culture SAUCC210055.
Notes.
Phyllostictaoblongifoliae is introduced, based on the multi-locus phylogenetic analysis as the strain clustered into a well-supported clade (Fig. 1; 1.00/100), which is closely related to Phyllostictaugeniae (0.98/81), but distinguished, based on molecular data, ITS, LSU, tef1, ACT and GPDH loci by 57 nucleotide differences in the concatenated alignment. Morphologically, P.oblongifoliae (SAUCC210052) differs from P.ugeniae (CBS 445.82) in its shorter and wider conidia (8.0–13.0 × 6.0–8.0 vs. 9.6–16.8 × 4.8–6.0 μm) (Wikee et al. 2013a). Therefore, we establish this fungus as a novel species (Jeewon and Hyde 2016).
. Phyllosticta pterospermi
Z.X. Zhang, X.Y. Liu, Z. Meng & X.G. Zhang sp. nov.
38604F69-9BB1-52E0-B304-8DE69A1F8755
843233
Type.
China, Hainan Province: Bawangling National Forest Park, on diseased leaves of Pterospermumheterophyllum, 19 May 2021, Z.X. Zhang (holotype, HSAUP210104; ex-holotype living culture SAUCC210104).
Etymology.
The specific epithet “pterospermi” refers to the genus name of the host plant Pterospermumheterophyllum.
Description.
Leaf endogenic and associated with leaf spots. Asexual morph: Conidiomata pycnidial, mostly aggregated in clusters, black, erumpent. On MEA, pycnidia exudes yellow conidial masses, within 15 days or longer. Pycnidial walls multilayered, textura angularis, brown, up to 30 μm thick; inner walls of hyaline. Conidiophores indistinct, often reduced to conidiogenous cells. Conidiogenous cells, cylindrical, hyaline, smooth, 7.5–11.0 × 2.5–4.5 μm. Conidia 8.0–12.0 × 4.5–8.5 μm, mean ± SD = 9.8 ± 0.9 × 7.3 ± 0.7 μm, hyaline, aseptate, thin and smooth-walled, coarsely guttulate or with a single large central guttule, obovoid, ellipsoidal to subglobose, enclosed in a thin mucoid sheath, 1.0–2.0 μm thick and bearing a hyaline, apical mucoid appendage, 4.0–6.8 × 1.5–3.0 μm, flexible, unbranched, tapering towards an acutely rounded tip.
Culture characteristics.
Colonies on PDA 80–90 mm in diameter after 14 days at 25 °C in darkness, with a growth rate of 5.7–6.5 mm/day, undulate at edge, grey white to greyish-green in obverse and reverse. Colonies on MEA 82–86 mm in diameter after 14 days at 25 °C in darkness, with a growth rate of 5.8–6.2 mm/day, undulate at edge, grey white to yellow in obverse and reverse, with moderate aerial mycelia on the surface, with black, gregarious conidiomata.
Additional specimen examined.
China, Hainan Province: Bawangling National Forest Park, on diseased leaves of Pterospermumheterophyllum. 19 May 2021, Z.X. Zhang, paratype HSAUP210106, ex-paratype living culture SAUCC210106.
Notes.
Two isolates from leaf spots of Pterospermumheterophyllum phylogenetically clustered into a well-supported clade (1.00/100), which is closely related to P.ardisiicola (0.90/62) and P.mangiferae (0.99/91; Fig. 1). However, P.pterospermi differs from P.ardisiicola by 30 nucleotides (13/603 in ITS, 3/553 in LSU and 14/248 ACT) and from P.mangiferae by 29 nucleotides (7/567 in ITS, 2/763 in LSU, 3/215 in tef1, 3/226 in ACT and 14/643 in GPDH). In morphology, they are distinguished by hosts and conidial size (8.0–12.0 × 4.5–8.5 μm in P.pterospermi vs. 7.0–11.0 × 5.0–7.5 μm in P.ardisiicola vs. 10.0–12.0 × 6.0–7.0 μm in P.mangiferae). Furthermore, P.pterospermi differs from P.ardisiicola and P.mangiferae by wider conidiogenous cells (7.5–11.0 × 2.5–4.5 μm vs. 5.0–12.5 × 1.2–2.5 μm) and from P.mangiferae in having longer conidiogenous cells (7.5–11.0 × 2.5–4.5 μm vs. 6.0–10.0 × 3.0–4.0 μm) (Motohashi et al. 2008; Glienke et al. 2011). Therefore, we establish this strain as P.pterospermi sp. nov. (Jeewon and Hyde 2016).
. Phyllosticta capitalensis
Henn., Hedwigia 48: 13. 1908
1AD5AD6B-00B6-58A2-A45B-892AFC4C2BE8
Description.
Leaf endogenic and associated with leaf spots. Asexual morph: Conidiomata pycnidial, mostly aggregated in clusters, black, erumpent. In MEA, cultures exuded colourless to opaque conidial masses, appeared on pycnidia after 10 days or longer. Pycnidial walls of multilayered, textura angularis, brown to dark brown, up to 35 μm thick; inner walls hyaline. Conidiophores subcylindrical to ampulliform, frequently reduced to conidiogenous cells or branching from a basal supporting cell, coated in mucoid layer, 8.0–14.0 × 3.0–5.0 μm. Conidiogenous cells terminal, subcylindrical to ampulliform, hyaline, smooth, 8.0–11.0 × 3.0–4.5 μm. Conidia 9.0–12.5 × 5.0–7.0 μm, mean ± SD = 10.6 ± 0.9 × 6.2 ± 0.5 μm, solitary, hyaline, aseptate, thin and smooth walled, coarsely guttulate or with a single large central guttule, ovoid, ampulliform, ellipsoidal to subglobose, enclosed in a thin mucoid sheath, 1.3–2.7 μm thick and bearing a hyaline, apical mucoid appendage, 3.0–8.5 × 1.0–1.5 μm, flexible, unbranched, tapering towards an acutely rounded tip. Spermatia hyaline, smooth, guttulate to granular, bacilliform, 6.0–8.2 × 1.3–2.0 μm, occurring in conidioma with conidia. Sexual morph: Ascomata shape and wall like those of the conidiomata. Asci bitunicate, hyaline, clavate to broadly fusoid-ellipsoid, with visible apical chamber, 2 μm diam., 45–85 × 9–13 μm. Ascospores bi- to multiseriate, hyaline, smooth, granular to guttulate, aseptate, straight, rarely curved, widest in the middle, limoniform with obtuse ends, 15–18 × 6–7 μm.
Culture characteristics.
Colonies on PDA occupying an entire 90 mm Petri dish in 14 days at 25 °C in darkness, with a growth rate of 6.0–6.5 mm/day, greenish-black in obverse and reverse. Colonies on MEA 82–86 mm in diameter after 14 days at 25 °C in darkness, with a growth rate of 5.7–6.2 mm/day, undulate at edge, white to grey white in obverse and reverse, with moderate aerial mycelia on the surface, with black, gregarious conidiomata.
Specimens examined.
China, Hainan Province: Bawangling National Forest Park, on diseased leaves of Rhapisexcelsa (Thunb.) Henry ex Rehd, 19 May 2021, Z.X. Zhang, HSAUP210144, living culture SAUCC210144; on diseased leaves of Rhapisexcelsa. 19 May 2021, Z.X. Zhang, HSAUP210148, living culture SAUCC210148.
Notes.
Based on morphological features, Hennings (1908) described Phyllostictacapitalensis and Glienke et al. (2011) added molecular data. The holotype (CBS 128856) of P.capitalensis was collected from Stanhopeagraveolens (Glienke et al. 2011). In our current study, two isolates (SAUCC210144, SAUCC210148), collected from diseased leaves of Rhapisexcelsa, cluster in the P.capitalensis clade (Fig. 1). Although four other species are also in this clade, we consider these two isolates as P.capitalensis, based on their morphological characters, such as granular to guttulate ascospores (15–18 × 6–7 vs. 15–17 × 5–6 μm), subcylindrical to ampullate conidiogenous cells (8.0–11.0 × 3.0–4.5 vs. 7–10 × 3–5 μm), ellipsoidal to subglobose conidia (9–12.5 × 5–7 vs. 11–12 × 6–7 μm) and hyaline, apical mucoid appendages (3–8.5 × 1–1.5 vs. 6–8 × 1–1.5 μm).
Discussion
Compared to other parts of China, species richness is highly diverse in Hainan Province, especially in Bawangling National Forest Park, which has a typical tropical rainforest climate. The environment favours growth of unusual microbial species. Historically, Phyllosticta species have been identified by morphology and host association. However, overlapping morphology makes it difficult to pinpoint homologous characters and, consequently, traditional identification of Phyllosticta species has long been a complicated endeavour (Norphanphoun et al. 2020). This issue has led to confusion in the taxonomy of Phyllosticta. Molecular phylogenetics has promoted species delimitation and species complex determination (Baayen et al. 2002; Okane et al. 2003; Motohashi et al. 2009; Wulandari et al. 2009; Glienke et al. 2011; Wikee et al. 2012). Norphanphoun et al. (2020) introduced six species complexes in Phyllosticta, based on five gene loci encoding the internal transcribed spacer of ribosomal RNA (ITS rDNA), large subunit of ribosomal RNA (LSU rDNA), translation elongation factor 1 alpha (TEF1α), actin (ACT) and glycerol-3-phosphate dehydrogenase (GPDH). Amongst these, the P.capitalensis species complex consisted of 28 cryptic species, P.acaciigena, P.aloeicola, P.ardisiicola, P.aristolochiicola, P.azevinhi, P.beaumarisii, P.brazilianiae, P.capitalensis, P.carochlae, P.cavendishii, P.cordylinophila, P.eugeniae, P.fallopiae, P.ilicis-aquifolii, P.maculata, P.mangiferae, P.mangifera-indicae, P.musaechinensis, P.musarum, P.paracapitalensis, P.parthenocissi, P.partricuspidatae, P.philoprina, P.rhizophorae, P.schimae, P.schimicola, P.styracicola and P.vitis-rotundifoliae. In this study, we focus our analyses on the P.capitalensis species complex and report two new species and one new Chinese record.
Multilocus phylogeny, as well as morphological characters observed in culture, described and illustrated herein eight isolates of Phyllosticta species from three host genera, which contributed knowledge to the diversity of Phyllosticta species in Hainan, China. Two new species are proposed: P.oblongifoliae sp. nov. and P.pterospermi sp. nov. This is the first time we report Phyllosticta species from Pterospermumheterophyllum (Sterculiaceae). In a recent study, Allophomapterospermicola was reported as pathogenic to Pterospermum (Marin-Felix et al. 2019). In reality, the number of phytopathogenic fungi from the Pterospermum host is inherently small. The known species Phyllostictacapitalensis (synonym Guignardiamangiferae; Baayen et al. 2002) was described multiple times from Stanhopeagraveolens (Orchidaceae) in Brazil (Glienke et al. 2011). In this study, we describe and illustrate Phyllostictacapitalensis again. Each of these species show typical morphological characteristics of Phyllosticta, i.e. conidia with mucilaginous sheaths and an apical appendage (van der Aa 1973).
Phyllostictacapitalensis is a cosmopolitan endophytic species reported in more than 300 host records in Fungal Databases (https://nt.ars-grin.gov/fungaldatabases/index.cfm) (Okane et al. 2001, 2003; Baayen et al. 2002; Glienke et al. 2011; Wikee et al. 2013b; Wu et al. 2014; Zhang et al. 2015; Tran et al. 2019; Hattori et al. 2020). As a weak pathogen, P.capitalensis causes leaf spots on tea (Camelliasinensis), oil palm (Elaeisguineensis), Ricinuscommunis and black spot disease on Psidiumguajava (Cheng et al. 2019; Nasehi et al. 2019; Liao et al. 2020; Tang et al. 2020).
Supplementary Material
Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (nos. 31900014, U2002203, 31750001)
Citation
Zhang Z, Liu X, Zhang X, Meng Z (2022) Morphological and phylogenetic analyses reveal two new species and a new record of Phyllosticta (Botryosphaeriales, Phyllostictaceae) from Hainan, China. MycoKeys 91: 1–23. https://doi.org/10.3897/mycokeys.91.84803
Funding Statement
This work was jointly supported by the National Natural Science Foundation of China (nos. 31900014, U2002203, 31750001)
Supplementary materials
Data type
Phylogenetic.
Explanation note
The combined ITS, LSU, tef1, ACT and GAPDH sequences.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
Data type
Phylogenetic.
Explanation note
The combined ITS, LSU, tef1, ACT and GAPDH sequences.