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A plastidial retrograde-signal potentiates biosynthesis of systemic stress response activators

A plastidial retrograde-signal potentiates biosynthesis of systemic stress response activators

Authors :
Haiyan Ke
Xiang He
Jin-Zheng Wang
Mark Lemos
Katayoon Dehesh
William M. Gray
Liping Zeng
Source :
New Phytol
Publication Year :
2021
Publisher :
Cold Spring Harbor Laboratory, 2021.

Abstract

SummaryPlants 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 (MAPK3/6), and the consequential induction of the downstream events ultimately resulting in biosynthesis of the two SSR priming metabolites, pipecolic- and N-hydroxy-pipecolic acid.This work identifies plastids as the initiation site, and the plastidial retrograde-signal, MEcPP as the initiator of a multi-component signaling cascade potentiating the biosynthesis of SSR activators, in response to biotic and abiotic triggers.

Details

Database :
OpenAIRE
Journal :
New Phytol
Accession number :
edsair.doi.dedup.....d74ba883e031067fb0102973b530fb46
Full Text :
https://doi.org/10.1101/2021.09.21.461262