茉莉酸
生物
赤霉素
分解代谢
水稻
茉莉酸
串扰
细胞生物学
拟南芥
转录组
植物对草食的防御
突变体
基因
生物化学
植物
酶
基因表达
物理
光学
作者
Gaochen Jin,Jinfeng Qi,Hongyue Zu,S. Liu,Jonathan Gershenzon,Yonggen Lou,Ian T. Baldwin,Ran Li
出处
期刊:The Plant Cell
[Oxford University Press]
日期:2023-07-02
卷期号:35 (10): 3828-3844
被引量:12
标识
DOI:10.1093/plcell/koad191
摘要
Abstract Plant defense against herbivores is costly and often associated with growth repression. The phytohormone jasmonate (JA) plays a central role in prioritizing defense over growth during herbivore attack, but the underlying mechanisms remain unclear. When brown planthoppers (BPH, Nilaparvata lugens) attack rice (Oryza sativa), growth is dramatically suppressed. BPH infestation also increases inactive gibberellin (GA) levels and transcripts of GA 2-oxidase (GA2ox) genes, 2 (GA2ox3 and GA2ox7) of which encode enzymes that catalyze the conversion of bioactive GAs to inactive GAs in vitro and in vivo. Mutation of these GA2oxs diminishes BPH-elicited growth restriction without affecting BPH resistance. Phytohormone profiling and transcriptome analyses revealed that GA2ox-mediated GA catabolism was enhanced by JA signaling. The transcript levels of GA2ox3 and GA2ox7 were significantly attenuated under BPH attack in JA biosynthesis (allene oxide cyclase [aoc]) or signaling-deficient (myc2) mutants. In contrast, GA2ox3 and GA2ox7 expression was increased in MYC2 overexpression lines. MYC2 directly binds to the G-boxes in the promoters of both GA2ox genes to regulate their expression. We conclude that JA signaling simultaneously activates defense responses and GA catabolism to rapidly optimize resource allocation in attacked plants and provides a mechanism for phytohormone crosstalk.
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