Plastid-nucleus communication involves calcium-modulated MAPK signalling

Hailong Guo, Peiqiang Feng, Wei Chi, Xuwu Sun, Xiumei Xu, Yuan Li, Dongtao Ren, Congming Lu, Jean David Rochaix, Dario Leister and Lixin Zhang ()
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Hailong Guo: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Peiqiang Feng: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Wei Chi: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Xuwu Sun: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Xiumei Xu: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Yuan Li: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University
Dongtao Ren: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University
Congming Lu: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences
Jean David Rochaix: University of Geneva
Dario Leister: Ludwig Maximilians University
Lixin Zhang: Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences

Nature Communications, 2016, vol. 7, issue 1, 1-15

Abstract: Abstract Chloroplast retrograde signals play important roles in coordinating the plastid and nuclear gene expression and are critical for proper chloroplast biogenesis and for maintaining optimal chloroplast functions in response to environmental changes in plants. Until now, the signals and the mechanisms for retrograde signalling remain poorly understood. Here we identify factors that allow the nucleus to perceive stress conditions in the chloroplast and to respond accordingly by inducing or repressing specific nuclear genes encoding plastid proteins. We show that ABI4, which is known to repress the LHCB genes during retrograde signalling, is activated through phosphorylation by the MAP kinases MPK3/MPK6 and the activity of these kinases is regulated through 14-3-3ω-mediated Ca2+-dependent scaffolding depending on the chloroplast calcium sensor protein CAS. These findings uncover an additional mechanism in which chloroplast-modulated Ca2+ signalling controls the MAPK pathway for the activation of critical components of the retrograde signalling chain.

Date: 2016
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DOI: 10.1038/ncomms12173

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