MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis
MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis
复制标题
拟南芥光诱导花青素积累需要 MPK4 磷酸化 MYB75
DOI：
10.1105/tpc.16.00130
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发表时间：
2016-11-01
期刊：
影响因子：
11.6
通讯作者：
Qiu, Jin-Long
中科院分区：
文献类型：
--
作者：
Li, Shengnan;Wang, Wenyi;Qiu, Jin-Long
光是影响植物各种生理和代谢过程的重要环境因子。虽然植物光感受器的特点，光调节下游反应的机制还不清楚。在拟南芥中，光保护花青素色素的积累是光依赖性的，并且R2 R3 MYB转录因子MYB 75/PAP 1调节花青素积累。在这里，我们报告MYB 75与MAP激酶4（MPK 4）相互作用并被其磷酸化。它们的相互作用依赖于MPK 4激酶活性，并且是MYB 75的完全功能所必需的。MPK 4可以响应于光而被激活，并且参与光诱导的花青素苷积累。我们发现MYB 75的MPK 4磷酸化增加了其稳定性，并且对光诱导的花青素苷积累至关重要。我们的研究结果揭示了MAPK通路在光信号转导中的重要作用。
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.