BRANCHED1 Interacts with FLOWERING LOCUS T to Repress the Floral Transition of the Axillary Meristems in Arabidopsis
BRANCHED1 Interacts with FLOWERING LOCUS T to Repress the Floral Transition of the Axillary Meristems in Arabidopsis
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DOI：
10.1105/tpc.112.109090
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发表时间：
2013-04-01
期刊：
影响因子：
11.6
通讯作者：
Araki, Takashi
中科院分区：
文献类型：
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作者：
Niwa, Masaki;Daimon, Yasufumi;Araki, Takashi
植物结构表现出很大程度的发育可塑性。一些关键的决定因素是由系统开花信号（花原）诱导的花转变时间和由BRANCHED1 （BRC1）等关键因子调控的分枝模式。在这里，我们报道BRC1与开花蛋白开花位点T （FT）和FT的孪生姐妹（TSF）相互作用，但不与花抑制因子TERMINAL FLOWER1相互作用。在叶片中诱导的FT蛋白向芽中转移，表明FT蛋白在腋窝分生组织（axillary merisystem， AM）中也起着促进花转变的作用。与野生型相比，BRC1 -2突变体腋芽的成花转变更早，这表明BRC1在延迟AMs的成花转变中发挥了作用。遗传和基因表达分析表明，BRC1干扰了am中的花原（FT和TSF）功能。与此一致的是，BRC1在茎尖分生组织中的异位表达延迟了主茎的成花转变。综上所述，BRC1蛋白与FT和TSF蛋白相互作用，调节腋芽中的成花原活性，防止AMs过早成花。
Plant architecture shows a large degree of developmental plasticity. Some of the key determinants are the timing of the floral transition induced by a systemic flowering signal (florigen) and the branching pattern regulated by key factors such as BRANCHED1 (BRC1). Here, we report that BRC1 interacts with the florigen proteins FLOWERING LOCUS T (FT) and TWIN SISTER OF FT (TSF) but not with TERMINAL FLOWER1, a floral repressor. FT protein induced in leaves moves into the subtended bud, suggesting that FT protein also plays a role in promotion of the floral transition in the axillary meristem (AM). The brc1-2 mutant shows an earlier floral transition in the axillary shoots compared with the wild type, suggesting that BRC1 plays a role in delaying the floral transition of the AMs. Genetic and gene expression analyses suggest that BRC1 interferes with florigen (FT and TSF) function in the AMs. Consistent with this, BRC1 ectopically expressed in the shoot apical meristem delays the floral transition in the main shoot. These results taken together suggest that BRC1 protein interacts with FT and TSF proteins and modulates florigen activity in the axillary buds to prevent premature floral transition of the AMs.