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Comparative genomic and transcriptomic analyses reveal the hemibiotrophic stage shift of Colletotrichum fungi
Author(s) -
Gan Pamela,
Ikeda Kyoko,
Irieda Hiroki,
Narusaka Mari,
O'Connell Richard J.,
Narusaka Yoshihiro,
Takano Yoshitaka,
Kubo Yasuyuki,
Shirasu Ken
Publication year - 2013
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12085
Subject(s) - biology , gene , transcriptome , genome , secondary metabolite , microbiology and biotechnology , fungus , genetics , ascomycota , mycosphaerella graminicola , proteases , gene expression , enzyme , botany , biochemistry
Summary Hemibiotrophic fungal plant pathogens represent a group of agronomically significant disease‐causing agents that grow first on living tissue and then cause host death in later, necrotrophic growth. Among these, C olletotrichum spp. are devastating pathogens of many crops. Identifying expanded classes of genes in the genomes of phytopathogenic C olletotrichum , especially those associated with specific stages of hemibiotrophy, can provide insights on how these pathogens infect a large number of hosts. The genomes of C olletotrichum orbiculare , which infects cucurbits and N icotiana benthamiana , and C . gloeosporioides , which infects a wide range of crops, were sequenced and analyzed, focusing on features with potential roles in pathogenicity. Regulation of C . orbiculare gene expression was investigated during infection of N . benthamiana using a custom microarray. Genes expanded in both genomes compared to other fungi included sequences encoding small, secreted proteins ( SSP s), secondary metabolite synthesis genes, proteases and carbohydrate‐degrading enzymes. Many SSP and secondary metabolite synthesis genes were upregulated during initial stages of host colonization, whereas the necrotrophic stage of growth is characterized by upregulation of sequences encoding degradative enzymes. Hemibiotrophy in C . orbiculare is characterized by distinct stage‐specific gene expression profiles of expanded classes of potential pathogenicity genes.