The Central Circadian Clock Protein TaCCA1 Regulates Seedling Growth and Spike Development in Wheat (Triticum aestivum L.)
文献类型: 外文期刊
作者: Gong, Jie 1 ; Tang, Yimiao 1 ; Liu, Yongjie 1 ; Sun, Renwei 1 ; Li, Yanhong 1 ; Ma, Jinxiu 1 ; Zhang, Shengquan 2 ; Zhang, Fengting 2 ; Chen, Zhaobo 2 ; Liao, Xiangzheng 2 ; Sun, Hui 2 ; Lu, Zefu 3 ; Zhao, Changping 1 ; Gao, Shiqing 1 ;
作者机构: 1.Beijing Acad Agr & Forestry Sci, Municipal Key Lab Mol Genet Hybrid Wheat, Beijing, Peoples R China
2.Beijing Acad Agr & Forestry Sci, Inst Hybrid Wheat, Beijing, Peoples R China
3.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improve, Beijing, Peoples R China
关键词: CCA1; EE motif; energy metabolism; histone modification; photosynthesis; wheat
期刊名称:FRONTIERS IN PLANT SCIENCE ( 影响因子:6.627; 五年影响因子:7.255 )
ISSN: 1664-462X
年卷期: 2022 年 13 卷
页码:
收录情况: SCI
摘要: The biological functions of the circadian clock on growth and development have been well elucidated in model plants, while its regulatory roles in crop species, especially the roles on yield-related traits, are poorly understood. In this study, we characterized the core clock gene CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1) homoeologs in wheat and studied their biological functions in seedling growth and spike development. TaCCA1 homoeologs exhibit typical diurnal expression patterns, which are positively regulated by rhythmic histone modifications including histone H3 lysine 4 trimethylation (H3K4me3), histone H3 lysine 9 acetylation (H3K9Ac), and histone H3 lysine 36 trimethylation (H3K36me3). TaCCA1s are preferentially located in the nucleus and tend to form both homo- and heterodimers. TaCCA1 overexpression (TaCCA1-OE) transgenic wheat plants show disrupted circadian rhythmicity coupling with reduced chlorophyll and starch content, as well as biomass at seedling stage, also decreased spike length, grain number per spike, and grain size at the ripening stage. Further studies using DNA affinity purification followed by deep sequencing [DNA affinity purification and sequencing (DAP-seq)] indicated that TaCCA1 preferentially binds to sequences similarly to "evening elements" (EE) motif in the wheat genome, particularly genes associated with photosynthesis, carbon utilization, and auxin homeostasis, and decreased transcriptional levels of these target genes are observed in TaCCA1-OE transgenic wheat plants. Collectively, our study provides novel insights into a circadian-mediated mechanism of gene regulation to coordinate photosynthetic and metabolic activities in wheat, which is important for optimal plant growth and crop yield formation.
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