The Raf‐like MAPKKKs STY8, STY17, and STY46 negatively regulate Botrytis cinerea resistance by limiting MKK7 protein accumulation in Arabidopsis

Author:

Chen Lijuan12,Xiao Jiahui1,Li You1,Song Yuxiao1,Liu Jun1,Zhou Qi1,Sun Ting1,Wang Hong‐Bin3,Liu Bing1ORCID

Affiliation:

1. School of Life Sciences, Guangdong Provincial Key Laboratory of Plant Resources Sun Yat‐sen University Guangzhou 510275 People's Republic of China

2. Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research 510640 Guangzhou People's Republic of China

3. School of Pharmaceutical Sciences, Institute of Medical Plant Physiology and Ecology Guangzhou University of Chinese Medicine 510006 Guangzhou People's Republic of China

Abstract

SUMMARYPlant diseases, which seriously damage crop production, are in most cases caused by fungal pathogens. In this study, we found that the Raf‐like MAPKKKs STY8 (SERINE/THREONINE/TYROSINE KINASE 8), STY17, and STY46 negatively regulate resistance to the fungal pathogen Botrytis cinerea through jasmonate response in Arabidopsis. Moreover, STY8/STY17/STY46 homologs negatively contribute to chitin signaling. We further identified MKK7 as the MAPKK component interacting with STY8/STY17/STY46 homologs. MKK7 positively contributes to resistance to B. cinerea and chitin signaling. Furthermore, we found that STY8/STY17/STY46 homologs negatively affect the accumulation of MKK7, in accordance with the opposite roles of MKK7 and STY8/STY17/STY46 homologs in defense against B. cinerea. These results provide new insights into the mechanisms precisely regulating plant immunity via Raf‐like MAPKKKs.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Cell Biology,Plant Science,Genetics

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