Abstract
Pseudomonas syringae pv. panici is a phytopathogenic bacterium causing brown stripe disease in economically important crops worldwide. Here, we announce the draft genome sequence of Pseudomonas syringae pv. panici LMG2367 to provide further valuable insights for comparison of the pathovars among species Pseudomonas syringae.
GENOME ANNOUNCEMENT
Pseudomonas syringae pv. panici, first identified from proso millet (Panicum miliaceum L.), is a Gram-negative phytopathogenic bacterium which can cause diseases in a wide range of plant species, including many economically important crops, and appears to be widely distributed worldwide (4, 5, 11, 12). As previously reported, it is pathogenic to proso millet, lilac, pearl millet, and rice (13). In rice, this pathogen can cause rice bacterial brown stripe disease. The symptoms consist of water-soaked stripes on the leaves and leaf sheaths, which turn brown. The pathogen can also attack young, unfolded leaves, resulting in the stunting or death of seedlings (3, 5, 6), which is similar to the symptoms caused by Acidovorax avenae subsp. avenae (10). The disease is more severe in the years after floods. Therefore, this pathogen has been gaining increasing attention in China.
We sequenced and annotated the draft genome of P. syringae pv. panici LMG2367 collected from proso millet. Genomic DNA was isolated with a Wizard genomic DNA purification kit (Promega, Madison, WI), and sequencing was performed using a 454 sequencing system. The whole-genome sequencing approach resulted in 561,825 high-quality filtered reads with an average paired-end read length of 431 bp and 300-fold sequencing coverage on average. Quality-filtered reads were assembled in silico with Newbler 2.7 and the Geneious Pro 5.6 program, resulting in a total of 148 contigs. Functional annotation was done by analyzing results obtained from the RAST (Rapid Annotation using Subsystem Technology) server (2), BLAST (1), tRNAscan-SE 1.21 (8), and RNAmmer 1.2 (7).
Here we present the draft genome sequence of strain LMG2367, comprising 5,993,947 bp, with a G+C content of 59.0%. A total of 5,440 coding sequences (CDSs) were predicted using GLIMMER (9). The draft genome sequence encodes 70 RNAs, including 10 16S rRNA genes, four copies of 23S rRNA genes, and 56 tRNAs. Furthermore, 80% of the open reading frames (ORFs) have orthologs in the reference strain Pseudomonas syringae pv. syringae FF5 (BLASTP E-value, 1E−20), but 1,093 ORFs were not found in the released genomes of members of the Pseudomonas genus.
Pathogenicity-related genes (such as those involved in hypersensitive response and the type III secretion system-related proteins) and the type VI secretion system, which are essential for many plant-pathogenic bacteria, are found in P. syringe pv. panici. Meanwhile, several loci encoding resistance-nodulation-cell division (RND) efflux system, fimbrial biosynthesis, and adhesion-type proteins were also found. Overall, the genome sequence of P. syringe pv. panici provides a basis for both basic and agricultural applied research. The genome sequence of P. syringae pv. panici also provides an important data resource for epidemiological studies, comparative genomics, and quarantine measures for this devastating phytopathogen.
Nucleotide sequence accession numbers.
This whole-genome shotgun project has been deposited at DDBJ/EMBL/GenBank under accession number ALAC00000000. The version described in this paper is the first version, ALAC01000000.
ACKNOWLEDGMENTS
This project was supported by 12th Five Years Key Programs for Science and Technology Development of China (2012BAK11B02; 2012BAK11B06), Zhejiang Provincial Nature Science Foundation of China (LY12C14007), the Special Fund for Agro-Scientific Research in the Public Interest (201003029; 201003066), the National Natural Science Foundation of China (30871655), and Zhejiang Agriculture Department (Ji-fa 2008-97).
We thank the BCCM/LMG Bacteria Collection of Belgium for providing us the strain Pseudomonas syringae pv. panici LMG 2367.
REFERENCES
- 1.Altschul SF, et al. 1990. Basic local alignment search tool. J. Mol. Biol. 215:403–410 [DOI] [PubMed] [Google Scholar]
- 2.Aziz RK, et al. 2008. The RAST server: rapid annotations using subsystems technology. BMC Genomics 9:75 doi:10.1186/1471-2164-9-75. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 3.Bradbury JF. 1986. Guide to plant pathogenic bacteria. CAB International Mycological Institute, Kew, England [Google Scholar]
- 4.Dye DW, et al. 1980. International standards for naming pathovars of phytopathogenic bacteria and a list of pathovars names and pathotype strains. Rev. Plant Pathol. 59:153–168 [Google Scholar]
- 5.Elliott C. 1923. A bacterial stripe disease of proso millet. J. Agr. Res. 26:151–160 [Google Scholar]
- 6.Goto K, Ohata KI. 1961. Bacterial stripe of rice. Spec. Publ. Coll. Agric. Natl. Taiwan Univ. 10:49–59 [Google Scholar]
- 7.Lagesen K, et al. 2007. RNAmmer: consistent and rapid annotation of rRNA genes. Nucleic Acids Res. 35:3100–3108 [DOI] [PMC free article] [PubMed] [Google Scholar]
- 8.Lowe TM, Eddy SR. 1997. tRNAscan-SE: a program for improved detection of tRNA genes in genomic sequence. Nucleic Acids Res. 25:955–964 [DOI] [PMC free article] [PubMed] [Google Scholar]
- 9.Salzberg SL, Delcher AL, Kasif SA, White O. 1998. Microbial gene identification using interpolated Markov models. Nucleic Acids Res. 26:544–548 [DOI] [PMC free article] [PubMed] [Google Scholar]
- 10.Xie GL, et al. 2011. Genome sequence of the rice pathogenic bacterium Acidovorax avenae subsp. avenae RS-1. J. Bacteriol. 193:5013–5014 [DOI] [PMC free article] [PubMed] [Google Scholar]
- 11.Yaoita T, Fujimaki Y. 1984. Control of rice bacterial brown stripe disease [caused by Pseudomonas syringae pv. panici] multiplied in Hatomune auto-sproutor with Kasugamycin, p 86–90. In Abe T, Tsujimoto K. (ed), Proceedings of the Association for Plant Protection of Hokuriku, 32 Niigata-ken Agricultural Experiment Station, Nagaoka, Japan [Google Scholar]
- 12.Young JM, et al. 1978. A proposed nomenclature and classification for plant pathogenic bacteria. New Zeal. J. Agr. Res. 21:153–177 [Google Scholar]
- 13.Young JM, Fletcher MJ. 1994. Pseudomonas syringae pv. panici (Elliott 1923) Young, Dye & Wilkie 1978 is a doubtful name. Australas. Plant Pathol. 23:66–68 [Google Scholar]