Arabidopsis FHY3 and FAR1 integrate light and strigolactone signaling to regulate branching
Arabidopsis FHY3 and FAR1 integrate light and strigolactone signaling to regulate branching
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拟南芥 FHY3 和 FAR1 整合光和独脚金内酯信号传导来调节分枝
DOI：
10.1038/s41467-020-15893-7
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发表时间：
2020-04
影响因子：
16.6
通讯作者：
Haiyang Wang
中科院分区：
文献类型：
--
作者：
Yurong Xie;Yang Liu;Mengdi Ma;Qin Zhou;Yongping Zhao;Binbin Zhao;Baobao Wang;Hongbin Wei;Haiyang Wang
分枝/分蘖是植物构型的一个重要参数，受内部因素(如植物激素)和外部因素(如光照条件)的严格调控。不同的信号通路如何汇聚来协调调节分支还不是很清楚。在此，我们报道了在拟南芥中，光敏色素A介导的光信号转导所必需的两个同源转录因子FHY3和FAR1，以及三个STRG内酯(SL)信号通路的关键抑制因子SMXL6/SMXL7/SMXL8直接与SPL9和SPL15相互作用，抑制它们对分枝的关键抑制因子BRC1的转录激活，从而促进分枝。此外，FHY3和FAR1还直接上调SMXL6和SMXL7的表达以促进分枝。模拟遮荫处理减少了FHY3蛋白的积累，导致BRC1表达增加，分枝减少。我们的结果建立了一个整合的模型，即LIGH和SL通过汇聚在BRC1启动子上来协调调节BRC1的表达和分支。
Branching/tillering is an important parameter of plant architecture and is tightly regulated by both internal factors (such as plant hormones) and external factors (such as light conditions). How the various signaling pathways converge to coordinately regulate branching is not well understood. Here, we report that in Arabidopsis, FHY3 and FAR1, two homologous transcription factors essential for phytochrome A-mediated light signaling, and SMXL6/SMXL7/SMXL8, three key repressors of the strigolactone (SL) signaling pathway, directly interact with SPL9 and SPL15 and suppress their transcriptional activation of BRC1, a key repressor of branching, thus promoting branching. In addition, FHY3 and FAR1 also directly up-regulate the expression of SMXL6 and SMXL7 to promote branching. Simulated shade treatment reduces the accumulation of FHY3 protein, leading to increased expression of BRC1 and reduced branching. Our results establish an integrated model of light and SL coordinately regulating BRC1 expression and branching through converging at the BRC1 promoter.
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影响因子：
4.9
作者：
Minakuchi K;Kameoka H;Yasuno N;Umehara M;Luo L;Kobayashi K;Hanada A;Ueno K;Asami T;Yamaguchi S;Kyozuka J
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影响因子：
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