BRANCHED1 Interacts with FLOWERING LOCUS T to Repress the Floral Transition of the Axillary Meristems in Arabidopsis

We report that BRC1 interacts with the florigen proteins FLOWERING LOCUS T and TWIN SISTER OF FT but not with TERMINAL FLOWER1, a floral repressor

Masaki Niwa; Yasufumi Daimon; Ken-ichi Kurotani; Asuka Higo; José L. Pruneda-Paz; Ghislain Breton; Nobutaka Mitsuda; Steve A. Kay; Masaru Ohme-Takagi; Motomu Endo; Takashi Araki

2013

Scholarcy highlights

  • There is a large degree of developmental plasticity in plant architecture, which is determined in part by the timing of floral transition and the branching pattern
  • The floral transition is induced by a systemic flowering signal, and plant architecture is often remodeled upon the floral transition in the shoot apical meristem
  • Because some TCP family members were not represented in the two transcription factor libraries, we performed yeast two-hybrid assays with the individual TCP transcriptional factors that have been reported to be involved in various developmental processes
  • We showed that the BRC1 interacts with FLOWERING LOCUS T
  • BRC1 interacts with TWIN SISTER OF FT, whereas it did not interact with TERMINAL FLOWER1
  • Our study indicates that FT protein expressed in the leaf is transported into the axillary bud and promotes floral transition of the axillary meristem
  • TERMINAL FLOWER1 is expressed in the axillary meristem as well as in the shoot apical meristem, and some axillary shoots are replaced by solitary flowers in tfl1 mutants, indicating TFL1 is involved in the suppression of phase transition in AMs. BRC1 showed no interaction with TFL1, and the tfl1-17 brc1-2 double mutant showed an additive reduction in the leaf number of axillary shoots under SD conditions

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