The OsBSK1-2-MAPK module regulates blast resistance in rice
Shengping Li,
Xinquan Xiang,
Zhijuan Diao,
Na Xia,
Ling Lu,
Jing Zhang,
Zhiwei Chen,
Dingzhong Tang
Affiliations
Shengping Li
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Fujian Provincial Key Laboratory of Crop Breeding by Design, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Corresponding authors.
Xinquan Xiang
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Zhijuan Diao
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; College of Life Science, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Na Xia
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Ling Lu
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Jing Zhang
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Zhiwei Chen
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Fujian Provincial Key Laboratory of Crop Breeding by Design, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
Dingzhong Tang
State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Corresponding authors.
Receptor-like cytoplasmic kinase OsBSK1-2 was reported to play an important role in regulation of response to rice blast, but the signaling pathway remained unknown. In this study, we identified OsMAPKKK18 and previously uncharacterized MAPKKKs OsMAPKKK16 and OsMAPKKK19 that interact with OsBSK1-2. Expression of all three MAPKKKs was induced by Magnaporthe oryzae infection, and all three induced cell death when transiently expressed in Nicotiana benthamiana leaves. Knockout of OsMAPKKK16 and OsMAPKKK18 compromised blast resistance and overexpression of OsMAPKKK19 increased blast resistance, indicating that all three MAPKKKs are involved in regulation of rice blast response. Furthermore, both OsMAPKKK16 and OsMAPKKK19 interacted with and phosphorylated OsMKK4 and OsMKK5, and chitin-induced MAPK activation was suppressed in osmapkkk16 and osbsk1-2 mutants. OsMAPKKK18 was earlier reported to interact with and phosphorylate OsMKK4 and affect chitin-induced MAPK activation, suggesting that OsBSK1-2 is involved in regulation of immunity through multiple MAPK signaling pathways. Unlike BSK1 in Arabidopsis, OsBSK1-2 was not involved in response to avirulent M. oryzae strains. Taken together, our results revealed important roles of OsMAPKKK16/18/19 and a OsBSK1-2-OsMAPKKK16/18/19-OsMKK4/5 module in regulating response to rice blast.
