期刊
NEW PHYTOLOGIST
卷 232, 期 1, 页码 264-278出版社
WILEY
DOI: 10.1111/nph.17573
关键词
immune kinases; Phytophthora capsici; plant immunity; RLCK-VII; RXLR25
资金
- National Natural Science Foundation of China [32072507, 32000202, 32061130211]
- China Agricultural University
The study identified RXLR25 as a key virulence factor for P. capsici, enhancing plant susceptibility to oomycete pathogens and suppressing immune activation. RLCK-VII proteins such as RLCK-VII-6 and RLCK-VII-8 were found crucial for resistance to P. capsici.
Receptor-like cytoplasmic kinase subfamily VII (RLCK-VII) proteins are the central immune kinases in plant pattern-recognition receptor (PRR) complexes, and they orchestrate a complex array of defense responses against bacterial and fungal pathogens. However, the role of RLCK-VII in plant-oomycete pathogen interactions has not been established. Phytophthora capsici is a notorious oomycete pathogen that infects many agriculturally important vegetables. Here, we report the identification of RXLR25, an RXLR effector that is required for the virulence of P. capsici. In planta expression of RXLR25 significantly enhanced plants' susceptibility to Phytophthora pathogens. Microbial pattern-induced immune activation in Arabidopsis was severely impaired by RXLR25. We further showed that RXLR25 interacts with RLCK-VII proteins. Using nine rlck-vii high-order mutants, we observed that RLCK-VII-6 and RLCK-VII-8 members are required for resistance to P. capsici. The RLCK-VII-6 members are specifically required for Phytophthora culture filtrate (CF)-induced immune responses. RXLR25 directly targets RLCK-VII proteins such as BIK1, PBL8, and PBL17 and inhibits pattern-induced phosphorylation of RLCK-VIIs to suppress downstream immune responses. This study identified a key virulence factor for P. capsici, and the results revealed the importance of RLCK-VII proteins in plant-oomycete interactions.
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