期刊
NEW PHYTOLOGIST
卷 233, 期 4, 页码 1732-1749出版社
WILEY
DOI: 10.1111/nph.17890
关键词
MEcPP; MPK3; 6; N-hydroxy-pipecolic acid; pipecolic acid; plastidial retrograde signal; PP2C; D1; systemic stress response (SSR)
资金
- NSF CREATE-IGERT training program [NSF DGE-0653984]
- NSF-GRFP [1148897]
- Dr John W. Leibacher and Mrs Kathy Cookson endowed chair funds
- National Institutes of Health (NIH) [GM067203]
- NIH [R01GM107311-8]
Plants utilize complex signaling cascades to perceive and transduce informational cues for adaptive responses to environmental triggers. Research shows that both biotic and abiotic stresses induce accumulation of the plastidial retrograde signal metabolite MEcPP, initiating a multicomponent signaling cascade potentiating the biosynthesis of SSR activators.
Plants employ an array of intricate and hierarchical signaling cascades to perceive and transduce informational cues to synchronize and tailor adaptive responses. Systemic stress response (SSR) is a recognized complex signaling and response network quintessential to plant's local and distal responses to environmental triggers; however, the identity of the initiating signals has remained fragmented. Here, we show that both biotic (aphids and viral pathogens) and abiotic (high light and wounding) stresses induce accumulation of the plastidial-retrograde-signaling metabolite methylerythritol cyclodiphosphate (MEcPP), leading to reduction of the phytohormone auxin and the subsequent decreased expression of the phosphatase PP2C.D1. This enables phosphorylation of mitogen-activated protein kinases 3/6 and the consequential induction of the downstream events ultimately, resulting in biosynthesis of the two SSR priming metabolites pipecolic acid and N-hydroxy-pipecolic acid. This work identifies plastids as a major initiation site, and the plastidial retrograde signal MEcPP as an initiator of a multicomponent signaling cascade potentiating the biosynthesis of SSR activators, in response to biotic and abiotic triggers.
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