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Arabidopsis class II TCP transcription factors integrate with the FT-FD module to control flowering 

 
论文编号:
作者: Li DB
刊物名称: Plant Physiology
所属学科:
论文题目英文: Arabidopsis class II TCP transcription factors integrate with the FT-FD module to control flowering
年: Jun 2019
卷: online
期:
页:
联系作者: Chen LG; Yu DQ
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影响因子: 6.305
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摘要:
The appropriate timing of flowering is critical for plant reproductive success. Although the FLOWERING LOCUS T (FT)-FD module plays crucial roles in the photoperiodic flowering pathway, the underlying mechanisms and signaling pathways involved still remain elusive. Here, we demonstrate that class II TCP transcription factors (TFs) integrate into the FT-FD complex to control floral initiation in Arabidopsis thaliana. Class II CINCINNATA (CIN) TCP TFs function as transcriptional activators by directly binding to the promoters of downstream floral meristem identity genes, such as APETALA1 (AP1). In addition, these TCPs directly interact with FD, a basic leucine zipper TF that plays a critical role in photoperiodic flowering, which further activates AP1 expression. Genetic analyses indicated that class II CIN TCP TFs function synergistically with FT and FD, to positively regulate flowering in an AP1-dependent manner. Thus, our results provide compelling evidence that class II CIN TCP TFs act directly at the AP1 promoter to enhance its transcription, thus further elucidating the molecular mechanisms underlying the regulation of photoperiodic flowering in Arabidopsis.
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