Genome sequence and spore germination-associated transcriptome analysis of Corynespora cassiicola from cucumber

BMC Microbiology

article

Gao, Shigang¹  Zeng, Rong¹  Xu, Lihui¹  Song, Zhiwei¹  Gao, Ping¹  Dai, Fuming¹ 

[1] Shanghai Runzhuang Agricultural Technology Co., Ltd;Shanghai Engineering Research Centre of Low-carbon Agriculture, Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences

关键词: Corynespora cassiicola;    Cucumber;    Genome sequence;    Virulence-associated gene;    Spore germination;    RNA-Seq;   

DOI  :  10.1186/s12866-020-01873-w

学科分类：放射科、核医学、医学影像

来源: BioMed Central

【 摘 要 】

Corynespora cassiicola, as a necrotrophic phytopathogenic ascomycetous fungus, can infect hundreds of species of plants and rarely causes human diseases. This pathogen infects cucumber species and causes cucumber target spot, which has recently caused large cucumber yield losses in China. Genome sequence and spore germination-associated transcriptome analysis will contribute to the understanding of the molecular mechanism of pathogenicity and spore germination of C. cassiicola. First, we reported the draft genome sequences of the cucumber-sampled C. cassiicola isolate HGCC with high virulence. Although conspecific, HGCC exhibited distinct genome sequence differences from a rubber tree-sampled isolate (CCP) and a human-sampled isolate (UM591). The proportion of secreted proteins was 7.2% in HGCC. A total of 28.9% (4232) of HGCC genes, 29.5% (4298) of CCP genes and 28.6% (4214) of UM591 genes were highly homologous to experimentally proven virulence-associated genes, respectively, which were not significantly different (P = 0.866) from the average (29.7%) of 10 other phytopathogenic fungi. Thousands of putative virulence-associated genes in various pathways or families were identified in C. cassiicola. Second, a global view of the transcriptome of C. cassiicola spores during germination was evaluated using RNA sequencing (RNA-Seq). A total of 3288 differentially expressed genes (DEGs) were identified. The majority of KEGG-annotated DEGs were involved in metabolism, genetic information processing, cellular processes, the organismal system, human diseases and environmental information processing. These results facilitate the exploration of the molecular pathogenic mechanism of C. cassiicola in cucumbers and the understanding of molecular and cellular processes during spore germination.

【 授权许可】

CC BY|CC0