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LMM24 Encodes Receptor-Like Cytoplasmic Kinase 109, Which Regulates Cell Death and Defense Responses in Rice.

ABSTRACT: Lesion mimic mutants are excellent models for research on molecular mechanisms of cell death and defense responses in rice. We identified a new rice lesion mimic mutant lmm24 from a mutant pool of indica rice cultivar "ZhongHui8015". The LMM24 gene was identified by MutMap, and LMM24 was confirmed as a receptor-like cytoplasmic kinase 109 by amino acid sequence analysis. The lmm24 mutant displayed dark brown lesions in leaves and growth retardation that were not observed in wild-type ZH8015. The results of histochemical staining and TUNEL assays showed enhanced ROS accumulation and cell death in lmm24. Chloroplast degradation was observed in lmm24 leaves, with decreased expression of photosynthesis-related genes and increased expression of the senescence-induced STAYGREEN (SGR) gene and other senescence-associated genes. Furthermore, lmm24 exhibited enhanced resistance to rice blast fungus Magnaporthe oryzae (M. oryzae) and up-regulation of defense response genes. Our data demonstrate that LMM24 regulates cell death and defense responses in rice.

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC6651581 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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<i>LMM24</i> Encodes Receptor-Like Cytoplasmic Kinase 109, Which Regulates Cell Death and Defense Responses in Rice.

Zhang Yue Y   Liu Qunen Q   Zhang Yingxin Y   Chen Yuyu Y   Yu Ning N   Cao Yongrun Y   Zhan Xiaodeng X   Cheng Shihua S   Cao Liyong L  

International journal of molecular sciences 20190702 13

Lesion mimic mutants are excellent models for research on molecular mechanisms of cell death and defense responses in rice. We identified a new rice lesion mimic mutant <i>lmm24</i> from a mutant pool of <i>indica</i> rice cultivar "ZhongHui8015". The <i>LMM24</i> gene was identified by MutMap, and <i>LMM24</i> was confirmed as a receptor-like cytoplasmic kinase 109 by amino acid sequence analysis. The <i>lmm24</i> mutant displayed dark brown lesions in leaves and growth retardation that were no  ...[more]

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