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The pathogenic mechanisms of Tilletia horrida as revealed by comparative and functional genomics

文献类型： 外文期刊

作者： Wang, Aijun 1 ; Pang, Linxiu 1 ; Wang, Na 1 ; Ai, Peng 1 ; Yin, Desuo 4 ; Li, Shuangcheng 1 ; Deng, Qiming 1 ; Zhu, Jun 1 ;

作者机构： 1.Sichuan Agr Univ, Rice Res Inst, Chengdu 611130, Sichuan, Peoples R China

2.Sichuan Agr Univ, Key Lab Sichuan Crop Major Dis, Chengdu 611130, Sichuan, Peoples R China

3.Sichuan Agr Univ, Key Lab Southwest Crop Gene Resource & Genet Impr, Minist Educ, Yaan 611130, Sichuan, Peoples R China

4.Hubei Acad Agr Sci, Food Crop Res Inst, Wuhan 611130, Hubei, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2018 年 8 卷

页码：

收录情况： SCI

摘要： Tilletia horrida is a soil-borne, mononucleate basidiomycete fungus with a biotrophic lifestyle that causes rice kernel smut, a disease that is distributed throughout hybrid rice growing areas worldwide. Here we report on the high-quality genome sequence of T. horrida; it is composed of 23.2 Mb that encode 7,729 predicted genes and 6,973 genes supported by RNA-seq. The genome contains few repetitive elements that account for 8.45% of the total. Evolutionarily, T. horrida lies close to the Ustilago fungi, suggesting grass species as potential hosts, but co-linearity was not observed between T. horrida and the barley smut Ustilago hordei. Genes and functions relevant to pathogenicity were presumed. T. horrida possesses a smaller set of carbohydrate-active enzymes and secondary metabolites, which probably reflect the specific characteristics of its infection and biotrophic lifestyle. Genes that encode secreted proteins and enzymes of secondary metabolism, and genes that are represented in the pathogen-host interaction gene database genes, are highly expressed during early infection; this is consistent with their potential roles in pathogenicity. Furthermore, among the 131 candidate pathogen effectors identified according to their expression patterns and functionality, we validated two that trigger leaf cell death in Nicotiana benthamiana. In summary, we have revealed new molecular mechanisms involved in the evolution, biotrophy, and pathogenesis of T. horrida.

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