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MYB112 connects light and circadian clock signals to promote hypocotyl elongation in Arabidopsis

文献类型： 外文期刊

作者： Cai, Yupeng 1 ; Liu, Yongting 1 ; Fan, Yangyang 3 ; Li, Xitao 1 ; Yang, Maosheng 1 ; Xu, Dongqing 5 ; Wang, Haiyang 6 ; Deng, Xing Wang 7 ; Li, Jian 1 ;

作者机构： 1.Southern Univ Sci & Technol, Key Lab Mol Design Plant Cell Factory Guangdong Hi, Inst Plant & Food Sci, Sch Life Sci, Shenzhen 518055, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Ctr Transgenic Res Plants, Beijing 100081, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Plant Protect, Beijing Engn Res Ctr Edible Mushroom, Beijing 100097, Peoples R China

4.Huizhou Univ, Sch Life Sci, Huizhou 516007, Peoples R China

5.Nanjing Agr Univ, Coll Agr, Natl Ctr Soybean Improvement, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China

6.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobio, Guangzhou 510642, Peoples R China

7.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Adv Agr Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China

8.Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.6； 五年影响因子：12.9 ）

ISSN： 1040-4651

年卷期： 2023 年

页码：

收录情况： SCI

摘要： The light-responsive transcription factor MYB112 increases transcript accumulation and transcriptional activation activity of PIF4 to promote hypocotyl elongation under diurnal cycles. Ambient light and the endogenous circadian clock play key roles in regulating Arabidopsis (Arabidopsis thaliana) seedling photomorphogenesis. PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) acts downstream of both light and the circadian clock to promote hypocotyl elongation. Several members of the R2R3-MYB transcription factor (TF) family, the most common type of MYB TF family in Arabidopsis, have been shown to be involved in regulating photomorphogenesis. Nonetheless, whether R2R3-MYB TFs are involved in connecting the light and clock signaling pathways during seedling photomorphogenesis remains unknown. Here, we report that MYB112, a member of the R2R3-MYB family, acts as a negative regulator of seedling photomorphogenesis in Arabidopsis. The light signal promotes the transcription and protein accumulation of MYB112. myb112 mutants exhibit short hypocotyls in both constant light and diurnal cycles. MYB112 physically interacts with PIF4 to enhance the transcription of PIF4 target genes involved in the auxin pathway, including YUCCA8 (YUC8), INDOLE-3-ACETIC ACID INDUCIBLE 19 (IAA19), and IAA29. Furthermore, MYB112 directly binds to the promoter of LUX ARRHYTHMO (LUX), the central component of clock oscillators, to repress its expression mainly in the afternoon and relieve LUX-inhibited expression of PIF4. Genetic evidence confirms that LUX acts downstream of MYB112 in regulating hypocotyl elongation. Thus, the enhanced transcript accumulation and transcriptional activation activity of PIF4 by MYB112 additively promotes the expression of auxin-related genes, thereby increasing auxin synthesis and signaling and fine-tuning hypocotyl growth under diurnal cycles.

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