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J Integr Plant Biol, 59 (2): 78-85, Research Article
COR27 and COR28 encode nighttime repressors integrating Arabidopsis circadian clock and cold response
Peng Wang1, Xuan Cui1, Chunsheng Zhao1, Liyan Shi1, Guowei Zhang1, Fenglong Sun2, Xiaofeng Cao2, Li Yuan1, Qiguang Xie1 and Xiaodong Xu1*
1Hebei Key Laboratory of Molecular and Cellular Biology, Key Laboratory of Molecular and Cellular Biology of Ministry of Education, College of Life Sciences, Hebei Normal University; Hebei Collaboration Innovation Center for Cell Signaling, Shijiazhuang, China
2State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
*Correspondence:
E-mail: Xiaodong Xu (xiaodong.xu@hebtu.edu.cn)
Abstract

It was noted that circadian components function in plant adaptation to diurnal temperature cycles and freezing tolerance. Our genome-wide transcriptome analysis revealed that evening-phased COR27 and COR28 mainly repress the transcription of clock-associated evening genes PRR5, ELF4 and cold-responsive genes. Chromatin immunoprecipitation indicated that CCA1 is recruited to the site containing EE elements of COR27 and COR28 promoters in a temperature-dependent way. Further genetic analysis shows COR28 is essential for the circadian function of PRR9 and PRR7. Together, our results support a role of COR27 and COR28 as nighttime repressors integrating circadian clock and plant cold stress responses.

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Received: 16 November 2016      Published: 19 December 2016
© 2017 Institute of Botany, Chinese Academy of Sciences
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