4.8 Article

Divergent roles of FT-like 9 in flowering transition under different day lengths in Brachypodium distachyon

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NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-08785-y

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资金

  1. National Natural Science Foundation of China [31570226, 91640109, 31700189]
  2. Zhejiang Provincial Natural Science Foundation of China [LR16C060001]
  3. China Postdoctoral Science Foundation [2017M610364, 2018T110586]
  4. State Key Laboratory of Crop Genetics and Germplasm Enhancement [ZW201807]
  5. Zhejiang University

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Timing of reproductive transition is precisely modulated by environmental cues in flowering plants. Facultative long-day plants, including Arabidopsis and temperate grasses, trigger rapid flowering in long-day conditions (LDs) and delay flowering under short-day conditions (SDs). Here, we characterize a SD-induced FLOWERING LOCUS T ortholog, FT-like 9 (FTL9), that promotes flowering in SDs but inhibits flowering in LDs in Brachypodium distachyon. Mechanistically, like photoperiod-inductive FT1, FTL9 can interact with FD1 to form a flowering activation complex (FAC), but the floral initiation efficiency of FTL9-FAC is much lower than that of FT1-FAC, thereby resulting in a positive role for FTL9 in promoting floral transition when FT1 is not expressed, but a dominant-negative role when FT1 accumulates significantly. We also find that CONSTANS 1 (CO1) can suppress FTL9 in addition to stimulate FT1 to enhance accelerated flowering under LDs. Our findings on the antagonistic functions of FTL9 under different day-length environments will contribute to understanding the multifaceted roles of FT in fine-tune modulation of photoperiodic flowering in plants.

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