Phosphorylation of FAR-RED ELONGATED HYPOCOTYL1 is a key mechanism defining signaling dynamics of phytochrome A under red and far-red light in Arabidopsis.

The Plant Cell
Fang ChenXing Wang Deng

Abstract

Emerging plants have to adapt to a high ratio of far-red light (FR)/red light (R) light in the canopy before they reach the R-enriched direct sunlight. Phytochrome A (phyA) is the single dominant photoreceptor in young Arabidopsis thaliana seedlings that initiates photomorphogenesis in response to a FR-enriched environment and transduces increasing R signals to early responsive genes. To date, how phyA differentially transmits FR and R signals to downstream genes remains obscure. Here, we present a phyA pathway in which FAR-RED ELONGATED HYPOCOTYL1 (FHY1), an essential partner of phyA, directly guides phyA to target gene promoters and coactivates transcription. Furthermore, we identified two phosphorylation sites on FHY1, Ser-39 and Thr-61, whose phosphorylation by phyA under R inhibits phyA signaling at each step of its pathway. Deregulation of FHY1 phosphorylation renders seedlings colorblind to FR and R. Finally, we show that the weaker phyA response resulting from FHY1 phosphorylation ensures the seedling deetiolation process in response to a R-enriched light condition. Collectively, our results reveal FHY1 phosphorylation as a key mechanism for FR/R spectrum-specific responses in plants and an essential event for plant ada...Continue Reading

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Citations

Nov 14, 2013·Journal of Experimental Botany·J J CasalR Sellaro
Jul 30, 2014·Proceedings of the National Academy of Sciences of the United States of America·Fang ChenXing Wang Deng
Jun 8, 2013·Protein & Cell·Jigang LiXing Wang Deng
Oct 7, 2015·Trends in Plant Science·Xiaosa XuEnamul Huq
Feb 12, 2015·Molecular Plant·Hai Wang, Haiyang Wang
Jan 20, 2017·Plant, Cell & Environment·David J Sheerin, Andreas Hiltbrunner
Sep 27, 2018·The Plant Journal : for Cell and Molecular Biology·Hanna HelizonMathias Zeidler
Apr 15, 2020·The New Phytologist·Yanjun Jing, Rongcheng Lin
Jun 27, 2019·Biochemistry. Biokhimii︠a︡·V A Sineshchekov, O B Belyaeva
Nov 28, 2018·Proceedings of the National Academy of Sciences of the United States of America·Yangyang ZhouJigang Li
Jul 25, 2019·International Journal of Molecular Sciences·Quyen T N HoangJeong-Il Kim
Jul 22, 2021·The New Phytologist·Csaba PéterAndrás Viczián

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