GLK transcription factors accompany ELONGATED HYPOCOTYL5 to orchestrate light-induced seedling development in Arabidopsis

文献类型： 外文期刊

第一作者： Zhang, Ting

作者： Zhang, Ting;Zhang, Rui;Zeng, Xi-Yu;Ye, Lu-Huan;Zhu, Xin-Guang;Wang, Peng;Zhang, Ting;Zeng, Xi-Yu;Tian, Shi-Long;Zhang, Rui;Ye, Lu-Huan;Zhu, Xin-Guang;Wang, Peng;Lee, Sanghwa;Busch, Wolfgang;Zhang, Yi-Jing;Zhou, Wen-Bin

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2024 年 194 卷 4 期

页码：

收录情况： SCI

摘要： Light-induced de-etiolation is an important aspect of seedling photomorphogenesis. GOLDEN2 LIKE (GLK) transcriptional regulators are involved in chloroplast development, but to what extent they participate in photomorphogenesis is not clear. Here, we show that ELONGATED HYPOCOTYL5 (HY5) binds to GLK promoters to activate their expression, and also interacts with GLK proteins in Arabidopsis (Arabidopsis thaliana). The chlorophyll content in the de-etiolating Arabidopsis seedlings of the hy5 glk2 double mutants was lower than that in the hy5 single mutant. GLKs inhibited hypocotyl elongation, and the phenotype could superimpose on the hy5 phenotype. Correspondingly, GLK2 regulated the expression of photosynthesis and cell elongation genes partially independent of HY5. Before exposure to light, DE-ETIOLATED 1 (DET1) affected accumulation of GLK proteins. The enhanced etioplast development and photosystem gene expression observed in the det1 mutant were attenuated in the det1 glk2 double mutant. Our study reveals that GLKs act downstream of HY5, or additive to HY5, and are likely quantitatively adjusted by DET1, to orchestrate multiple developmental traits during the light-induced skotomorphogenesis-to-photomorphogenesis transition in Arabidopsis. GLK transcription factors act downstream of or additive to HY5 to regulate both chloroplast development and hypocotyl elongation during greening of Arabidopsis seedlings.

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