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BIG regulates stomatal immunity and jasmonate production in Arabidopsis
Author(s) -
Zhang RuoXi,
Ge Shengchao,
He Jingjing,
Li Shuangchen,
Hao Yanhong,
Du Hao,
Liu Zhongming,
Cheng Rui,
Feng YuQi,
Xiong Lizhong,
Li Chuanyou,
Hetherington Alistair M.,
Liang YunKuan
Publication year - 2019
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.15568
Subject(s) - arabidopsis , jasmonate , plant immunity , mutant , microbiology and biotechnology , biology , salicylic acid , methyl jasmonate , transcription factor , gene , jasmonic acid , arabidopsis thaliana , genetics
Summary Plants have evolved an array of responses that provide them with protection from attack by microorganisms and other predators. Many of these mechanisms depend upon interactions between the plant hormones jasmonate ( JA ) and ethylene ( ET ). However, the molecular basis of these interactions is insufficiently understood. Gene expression and physiological assays with mutants were performed to investigate the role of Arabidopsis BIG gene in stress responses. BIG transcription is downregulated by methyl JA (Me JA ), necrotrophic infection or mechanical injury. BIG deficiency promotes JA ‐dependent gene induction, increases JA production but restricts the accumulation of both ET and salicylic acid. JA ‐induced anthocyanin accumulation and chlorophyll degradation are enhanced and stomatal immunity is impaired by BIG disruption. Bacteria‐ and lipopolysaccaride ( LPS) ‐induced stomatal closure is reduced in BIG gene mutants, which are hyper‐susceptible to microbial pathogens with different lifestyles, but these mutants are less attractive to phytophagous insects. Our results indicate that BIG negatively and positively regulate the MYC 2 and ERF 1 arms of the JA signalling pathway. BIG warrants recognition as a new and distinct regulator that regulates JA responses, the synergistic interactions of JA and ET , and other hormonal interactions that reconcile the growth and defense dilemma in Arabidopsis.