Interactions between Auxin and Strigolactone in Shoot Branching Control
Interactions between Auxin and Strigolactone in Shoot Branching Control
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DOI：
10.1104/pp.109.137646
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发表时间：
2009-09-01
期刊：
影响因子：
7.4
通讯作者：
Leyser, Ottoline
中科院分区：
文献类型：
--
作者：
Hayward, Alice;Stirnberg, Petra;Leyser, Ottoline
在拟南芥中，类胡萝卜素裂解双加氧酶More axillary GROWTH3(MAX3)和MAX4与MAX1共同作用，产生抑制腋芽生长所需的马立内酯信号分子。我们发现MAX3和MAX4转录本都是生长素正调控基因，其方式类似于豌豆(豌豆)和水稻(Oryza Sativa)的同源基因，支持这种调控在植物中的进化保守。这种调节对于分枝控制很重要，因为这些转录本中与生长素相关的大量减少与腋下分枝的增加有关。这两种转录本在max突变体中都上调，并且与max突变体在极性生长素运输流中生长素增加的情况一致，这种反馈调节涉及生长素信号。我们认为生长素和斯特里内酯都有能力调节彼此的水平和分布，这是协调控制腋下分支所需的动态反馈环。
In Arabidopsis ( Arabidopsis thaliana), the carotenoid cleavage dioxygenases MORE AXILLARY GROWTH3 (MAX3) and MAX4 act together with MAX1 to produce a strigolactone signaling molecule required for the inhibition of axillary bud outgrowth. We show that both MAX3 and MAX4 transcripts are positively auxin regulated in a manner similar to the orthologous genes from pea ( Pisum sativum) and rice ( Oryza sativa), supporting evolutionary conservation of this regulation in plants. This regulation is important for branching control because large auxin-related reductions in these transcripts are associated with increased axillary branching. Both transcripts are up-regulated in max mutants, and consistent with max mutants having increased auxin in the polar auxin transport stream, this feedback regulation involves auxin signaling. We suggest that both auxin and strigolactone have the capacity to modulate each other's levels and distribution in a dynamic feedback loop required for the coordinated control of axillary branching.