MYB75 phosphorylation by MPK4 is required for light-induced anthocyanin accumulation in arabidopsis

TY - JOUR

T1 - MYB75 phosphorylation by MPK4 is required for light-induced anthocyanin accumulation in arabidopsis

AU - Li, Shengnan

AU - Wang, Wenyi

AU - Gao, Jinlan

AU - Yin, Kangquan

AU - Wang, Rui

AU - Wang, Chengcheng

AU - Petersen, Morten

AU - Mundy, John

AU - Qiu, Jin-Long

N1 - © 2016 American Society of Plant Biologists. All rights reserved.

PY - 2016/11

Y1 - 2016/11

N2 - Light is a major environmental cue affecting various physiological and metabolic processes in plants. Although plant photoreceptors are well characterized, the mechanisms by which light regulates downstream responses are less clear. In Arabidopsis thaliana, the accumulation of photoprotective anthocyanin pigments is light dependent, and the R2R3 MYB transcription factor MYB75/PAP1 regulates anthocyanin accumulation. Here, we report that MYB75 interacts with and is phosphorylated by MAP KINASE4 (MPK4). Their interaction is dependent on MPK4 kinase activity and is required for full function of MYB75. MPK4 can be activated in response to light and is involved in the light-induced accumulation of anthocyanins. We show that MPK4 phosphorylation of MYB75 increases its stability and is essential for light-induced anthocyanin accumulation. Our findings reveal an important role for a MAPK pathway in light signal transduction.

AB - Light is a major environmental cue affecting various physiological and metabolic processes in plants. Although plant photoreceptors are well characterized, the mechanisms by which light regulates downstream responses are less clear. In Arabidopsis thaliana, the accumulation of photoprotective anthocyanin pigments is light dependent, and the R2R3 MYB transcription factor MYB75/PAP1 regulates anthocyanin accumulation. Here, we report that MYB75 interacts with and is phosphorylated by MAP KINASE4 (MPK4). Their interaction is dependent on MPK4 kinase activity and is required for full function of MYB75. MPK4 can be activated in response to light and is involved in the light-induced accumulation of anthocyanins. We show that MPK4 phosphorylation of MYB75 increases its stability and is essential for light-induced anthocyanin accumulation. Our findings reveal an important role for a MAPK pathway in light signal transduction.

U2 - 10.1105/tpc.16.00130

DO - 10.1105/tpc.16.00130

M3 - Journal article

C2 - 27811015

SN - 1040-4651

VL - 28

SP - 2866

EP - 2883

JO - The Plant Cell

JF - The Plant Cell

IS - 11

ER -