| Autor: |
Wei Li, Ying‐Ying Tian, Jin‐Yu Li, Li Yuan, Lin‐Lin Zhang, Zhi‐Ye Wang, Xiaodong Xu, Seth Jon Davis, Jian‐Xiang Liu |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
The New phytologistReferences. 237(1) |
| ISSN: |
1469-8137 |
| Popis: |
Global warming has profound impact on growth and development, and plants constantly adjust their internal circadian clock to cope with external environment. However, how clock-associated genes fine-tune thermoresponsive growth in plants is little understood. We found that loss-of-function mutation of REVEILLE5 (RVE5) reduces the expression of circadian gene EARLY FLOWERING 4 (ELF4) in Arabidopsis, and confers accelerated hypocotyl growth under warm-temperature conditions. Both RVE5 and CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) accumulate at warm temperatures and bind to the same EE cis-element presented on ELF4 promoter, but the transcriptional repression activity of RVE5 is weaker than that of CCA1. The binding of CCA1 to ELF4 promoter is enhanced in the rve5-2 mutant at warm temperatures, and overexpression of ELF4 in the rve5-2 mutant background suppresses the rve5-2 mutant phenotype at warm temperatures. Therefore, the transcriptional repressor RVE5 finetunes ELF4 expression via competing at a cis-element with the stronger transcriptional repressor CCA1 at warm temperatures. Such a competition-attenuation mechanism provides a balancing system for modulating the level of ELF4 and thermoresponsive hypocotyl growth under warm-temperature conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Plný text