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

Author:

Zhang Ting12,Zhang Rui13ORCID,Zeng Xi-Yu12ORCID,Lee Sanghwa4ORCID,Ye Lu-Huan13ORCID,Tian Shi-Long2,Zhang Yi-Jing5ORCID,Busch Wolfgang4ORCID,Zhou Wen-Bin6ORCID,Zhu Xin-Guang13ORCID,Wang Peng13ORCID

Affiliation:

1. CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences , Shanghai 200032 , China

2. University of Chinese Academy of Sciences , Beijing 101408 , China

3. Key Laboratory of Plant Carbon Capture, CAS , Shanghai 200032 , China

4. Plant Molecular and Cellular Biology Laboratory, Salk Institute for Biological Studies , 10010 N Torrey Pines Rd, La Jolla, CA 92037 , USA

5. State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Biochemistry, Institute of Plant Biology, School of Life Sciences, Fudan University , Shanghai 200438 , China

6. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences , Beijing 100081 , China

Abstract

Abstract 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.

Funder

National Natural Science Foundation of China

Strategic Priority Research Program

Publisher

Oxford University Press (OUP)

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