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The DELLA-CONSTANS Transcription Factor Cascade Integrates Gibberellic Acid and Photoperiod Signaling to Regulate Flowering
Wang, Houping; Pan, Jinjing; Li, Yang; Lou, Dengji; Hu, Yanru; Yu, Diqiu
2016
Source PublicationPLANT PHYSIOLOGY
ISSN0032-0889
Volume172Issue:1Pages:479-488
AbstractGibberellin (GA) and photoperiod pathways have recently been demonstrated to collaboratively modulate flowering under long days (LDs). However, the molecular mechanisms underlying this collaboration remain largely unclear. In this study, we found that GA-induced expression of FLOWERING LOCUS T (FT) under LDs was dependent on CONSTANS (CO), a critical transcription factor positively involved in photoperiod signaling. Mechanistic investigation revealed that DELLA proteins, a group of crucial repressors in GA signaling, physically interacted with CO. The DELLA-CO interactions repressed the transcriptional function of CO protein. Genetic analysis demonstrated that CO acts downstream of DELLA proteins to regulate flowering. Disruption of CO rescued the earlier flowering phenotype of the gai-t6 rga-t2 rgl1-1 rgl2-1 mutant (dellap), while a gain-of-function mutation in GA INSENSITIVE (GAI, a member of the DELLA gene) repressed the earlier flowering phenotype of CO-overexpressing plants. In addition, the accumulation of DELLA proteins and mRNAs was rhythmic, and REPRESSOR OF GA1-3 protein was noticeably decreased in the long-day afternoon, a time when CO protein is abundant. Collectively, these results demonstrate that the DELLA-CO cascade inhibits CO/FT-mediated flowering under LDs, which thus provide evidence to directly integrate GA and photoperiod signaling to synergistically modulate flowering under LDs.
Subject AreaPlant Sciences
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10448
Collection植物分子生物学研究组
2012年后新成立研究组
Recommended Citation
GB/T 7714
Wang, Houping,Pan, Jinjing,Li, Yang,et al. The DELLA-CONSTANS Transcription Factor Cascade Integrates Gibberellic Acid and Photoperiod Signaling to Regulate Flowering[J]. PLANT PHYSIOLOGY,2016,172(1):479-488.
APA Wang, Houping,Pan, Jinjing,Li, Yang,Lou, Dengji,Hu, Yanru,&Yu, Diqiu.(2016).The DELLA-CONSTANS Transcription Factor Cascade Integrates Gibberellic Acid and Photoperiod Signaling to Regulate Flowering.PLANT PHYSIOLOGY,172(1),479-488.
MLA Wang, Houping,et al."The DELLA-CONSTANS Transcription Factor Cascade Integrates Gibberellic Acid and Photoperiod Signaling to Regulate Flowering".PLANT PHYSIOLOGY 172.1(2016):479-488.
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