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MAPKs and acetyl-coa are associated with Curvularia lunata pathogenicity and toxin production in maize

Journal of Integrative Agriculture 2018年第1期17卷 139-148页

作者： NI Xuan GAO Jin-xin YU Chuan-jin WANG Meng SUN Jia-nan LI Ya-qian CHEN Jie School of Agriculture and Biology Shanghai Jiao Tong University/State Key Laboratory of Microbial Metabolism Shanghai JiaoTong UniversityKey Laboratory of Urban Agriculture (South) Ministry of Agriculture Shanghai 200240 P.R.China

Mitogen-activated protein kinase （MAPK） cascades play an important role in extracellular signal transduction and are involved in the pathogenicity of fungal pathogens to host plants. In Curvularia lunata, the roles of two MAPK genes, Clkl and CIm 1, have already been studied. Clkl is involved in conidia formation and pathogenicity, and Clmf is closely related to pathogen cell wall formation and pathogenicity to maize leaves. In this study, a third C. lunata MAPK gene, Clhl, which is homologous to hog1, was successfully cloned. We found that a Clhl deletion mutant had lower intracellular glycerol accumulation than the wild-type stain and was unable to grow normally under osmotic stress conditions. Furthermore, the deletion mutants of three C. lunata MAPK genes （Clkl, Clml and Clhl） had lower levels of acetyi-coa, which is an important intermediate product in the synthesis of melanin and furan toxin, and down-regulated expression of pathogenicity-associated genes. Furthermore, pathogenicity and the ability to produce toxin were restored after adding acetyi-coa to the culture medium, suggesting that acetyi-coa is closely involved in the pathogen MAPK signaling pathway.

关键词： Curvularia lunata MAP kinase acetyi-coa pathology

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