乙烯通过调节DELLA蛋白生长抑制因子功能来调控拟南芥的发育。
Ethylene regulates arabidopsis development via the modulation of DELLA protein growth repressor function.
作者信息
Achard Patrick, Vriezen Wim H, Van Der Straeten Dominique, Harberd Nicholas P
机构信息
John Innes Centre, Norwich NR4 7UH, United Kingdom.
出版信息
Plant Cell. 2003 Dec;15(12):2816-25. doi: 10.1105/tpc.015685. Epub 2003 Nov 13.
Abstract
Phytohormones regulate plant development via a poorly understood signal response network. Here, we show that the phytohormone ethylene regulates plant development at least in part via alteration of the properties of DELLA protein nuclear growth repressors, a family of proteins first identified as gibberellin (GA) signaling components. This conclusion is based on the following experimental observations. First, ethylene inhibited Arabidopsis root growth in a DELLA-dependent manner. Second, ethylene delayed the GA-induced disappearance of the DELLA protein repressor of ga1-3 from root cell nuclei via a constitutive triple response-dependent signaling pathway. Third, the ethylene-promoted "apical hook" structure of etiolated seedling hypocotyls was dependent on the relief of DELLA-mediated growth restraint. Ethylene, auxin, and GA responses now can be attributed to effects on DELLA function, suggesting that DELLA plays a key integrative role in the phytohormone signal response network.
摘要
植物激素通过一个尚不清楚的信号应答网络调控植物发育。在此，我们表明植物激素乙烯至少部分通过改变DELLA蛋白核生长阻遏物的特性来调控植物发育，DELLA蛋白家族最初被鉴定为赤霉素（GA）信号传导组分。这一结论基于以下实验观察结果。第一，乙烯以DELLA依赖的方式抑制拟南芥根的生长。第二，乙烯通过组成型三重反应依赖的信号通路延迟了GA诱导的ga1-3的DELLA蛋白阻遏物从根细胞核中的消失。第三，乙烯促进的黄化幼苗下胚轴的“顶端弯钩”结构依赖于DELLA介导的生长抑制的解除。现在，乙烯、生长素和GA反应可归因于对DELLA功能的影响，这表明DELLA在植物激素信号应答网络中起关键的整合作用。
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