文献类型: 外文期刊
作者: Li, Ping 1 ; Bai, Bin 1 ; Zhang, Hong-yan 1 ; Zhou, Heng 1 ; Zhou, Bo 1 ;
作者机构: 1.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China
2.Zhejiang Univ, Inst Biotechnol, Hangzhou 310058, Zhejiang, Peoples R China
关键词: Magnaporthe oryzae;Synteny;Transposon complex;Dynamics;Recombination
期刊名称:JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE B ( 影响因子:3.066; 五年影响因子:3.057 )
ISSN: 1673-1581
年卷期: 2012 年 13 卷 6 期
页码:
收录情况: SCI
摘要: Plants utilize multiple layers of defense mechanisms to fight against the invasion of diverse pathogens. The R gene mediates resistance, in most cases, dependent on the co-existence of its cognate pathogen-derived avirulence (Avr) gene. The rice blast R gene Piz-t corresponds in gene-for-gene fashion to the Magnaporthe oryzae Avr gene AvrPiz-t. In this study, we determined and compared the genomic sequences surrounding the AvrPiz-t gene in both avirulent and virulent isolates, designating as AvrPiz-t-ZB15 and avrPiz-t-70-15 regions, respectively. The sequence of the AvrPiz-t-ZB15 region is 120 966 bp whereas avrPiz-t-70-15 is 146 292 bp in length. The extreme sequence similarity and good synteny in gene order and content along with the absence of two predicted genes in the avrPiz-t-70-15 region were observed in the predicted protein-coding regions in the AvrPiz-t locus. Nevertheless, frequent presence/absence and highly dynamic organization of transposable elements (TEs) were identified, representing the major variation of the AvrPiz-t locus between different isolates. Moreover, TEs constitute 27.3% and 43.2% of the genomic contents of the AvrPiz-t-ZB15 and avrPiz-t-70-15 regions, respectively, indicating that TEs contribute largely to the organization and evolution of AvrPiz-t locus. The findings of this study suggest that M. oryzae could benefit in an evolutionary sense from the presence of active TEs in genes conferring avirulence and provide an ability to rapidly change and thus to overcome host R genes.
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