CCK1, a PMK1-type MAP kinase is required for hyphal growth, pigmentation, conidiation, enzyme activity, osmotic stress response, and pathogenicity in Corynespora cassiicola

文献类型： 外文期刊

第一作者： Liu, Xiaomei

作者： Liu, Xiaomei;Cao, Shenwen;Wei, Yunxie;Liu, Xiaomei;Cao, Shenwen;Zhang, He;Pu, Jinji

作者机构：

关键词： Corynespora cassiicola;Hevea brasiliensis;PMK1-type MAP kinase;Pigmentation;Conidiation;Virulence

期刊名称：EUROPEAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.907； 五年影响因子：2.022 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Corynespora cassiicola is a fungal pathogen causing Corynespora Leaf Fall disease (CLF) in rubber trees (Hevea brasiliensis). CLF has great economic impact in rubber-producing countries. However, the molecular mechanisms involved in the pathogenicity of C. cassiicola remain poorly understood. Mitogen-activated protein kinase (MAPK) is one of the major signaling pathways responsible for regulation of fungal development and virulence in many plant fungal pathogens. The C. cassiicola cck1 gene encodes a MAPK that is homologous to the rice pathogen Magnaporthe grisea MAPK Pmk1 protein. In this study, targeted cck1 gene disruption and complementation experiments were carried out in C. cassiicola. Compared to the wild-type and C Delta cck1 complement, the Delta cck1 mutant had more pigmentation and exhibited dramatically reduced aerial mycelial mass and mycelial growth rates, along with the inability to produce conidia or conidiophores. In addition, the Delta cck1 hyphae were darker in color and had less branches and septae with visibly condensed protoplasm. The Delta cck1 mutant was more resistant to hyperosmotic stress, and was able to produce greater amount of laccase and lesser cellulase in vitro; however, the production of laccase was delayed. Importantly, Delta cck1 mycelia and crude toxin were less virulent upon inoculation of rubber tree leaves. These findings indicate that the C. cassiicola CCK1 MAP kinase is a versatile regulator involved in nearly every aspect of plant fungal pathogenicity including mycelial growth, development, differentiation, pigmentation, conidiation, production of extracellular degradation enzymes, osmoregulation, and virulence.

分类号： S432.1

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