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A bHLH transcription activator regulates defense signaling by nucleo‐cytosolic trafficking in rice
Author(s) -
Meng Fanwei,
Yang Chao,
Cao Jidong,
Chen Huan,
Pang Jinhuan,
Zhao Qiqi,
Wang Zongyi,
Qing Fu Zheng,
Liu Jun
Publication year - 2020
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/jipb.12922
Subject(s) - jasmonic acid , microbiology and biotechnology , biology , transcription factor , signal transduction , activator (genetics) , crosstalk , genetically modified rice , regulator , plant disease resistance , immune system , cytosol , gene , transgene , genetics , genetically modified crops , biochemistry , enzyme , physics , optics
Crosstalk between plant hormone signaling pathways is vital for controlling the immune response during pathogen invasion. Salicylic acid (SA) and jasmonic acid (JA) often play important but antagonistic roles in the immune responses of higher plants. Here, we identify a basic helix‐loop‐helix transcription activator, OsbHLH6, which confers disease resistance in rice by regulating SA and JA signaling via nucleo‐cytosolic trafficking in rice ( Oryza sativa ). OsbHLH6 expression was upregulated during Magnaporthe oryzae infection. Transgenic rice plants overexpressing OsbHLH6 display increased JA responsive gene expression and enhanced disease susceptibility to the pathogen. Nucleus‐localized OsbHLH6 activates JA signaling and suppresses SA signaling; however, the SA regulator OsNPR1 (Nonexpressor of PR genes 1) sequesters OsbHLH6 in the cytosol to alleviate its effect. Our data suggest that OsbHLH6 controls disease resistance by dynamically regulating SA and JA signaling.