数字农科院2.0

Semi-Dominant Mutation In The Cysteine-Rich R.eceptor-Like Kinase Gene, Als1, C onducts Constitutive Defence Response In Rice

文献类型： 外文期刊

作者： Du, D.;Ling, Y.;Zhang, C.;He, G.;Li, Y.;Chen, X.;Zhu, M.;Xing, Y.;Liu, M.;Lu, X.;Zhang, Y.;Zhang, Q.;Sang, X.

作者机构：

关键词： ALS1; hypersensitive resistance (HR); CRKs; disease resistance; rice (Oryza sativa L. subsp. italica.)

期刊名称： PLANT BIOLOGY

ISSN： 1435-8603

年卷期： 2019 年 21 卷 1 期

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摘要： Plants have evolved a sophisticated two-branch defence system to prevent the growth and spread of pathogen infection. The novel Cys-rich repeat (CRR) containing receptor-like kinases, known as CRKs, were reported to mediate defence resistance in plants. For rice, there are only two reports of CRKs. A semi-dominant lesion mimic mutant als1 (apoptosis leaf and sheath 1) in rice was identified to demonstrate spontaneous lesions on the leaf blade and sheath. A map-based cloning strategy was used for fine mapping and cloning of ALS1, which was confirmed to be a typical CRK in rice. Functional studies of ALS1 were conducted, including phylogenetic analysis, expression analysis, subcellular location and blast resistance identification. Most pathogenesis-related (PR) genes and other defence-related genes were activated and up-regulated to a high degree. ALS1 was expressed mainly in the leaf blade and sheath, in which further study revealed that ALS1 was present in the vascular bundles. ALS1 was located in the cell membrane of rice protoplasts, and its mutation did not change its subcellular location. Jasmonic acid (JA) and salicylic acid (SA) accumulation were observed in als1, and enhanced blast resistance was also observed. The mutation of ALS1 caused a constitutively activated defence response in als1. The results of our study imply that ALS1 participates in a defence response resembling the common SA-, JA- and NH1-mediated defence responses in rice.

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