Soluble Carbohydrates Regulate Auxin Biosynthesis via PIF Proteins in Arabidopsis
Soluble Carbohydrates Regulate Auxin Biosynthesis via PIF Proteins in Arabidopsis
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DOI：
10.1105/tpc.112.104794
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发表时间：
2012-12-01
期刊：
影响因子：
11.6
通讯作者：
Ljung, Karin
中科院分区：
文献类型：
--
作者：
Sairanen, Ilkka;Novak, Ondrej;Ljung, Karin
植物必然是高度竞争的，并且有精细的调节机制来调整生长和发育，以适应环境中的机遇和限制。光合作用产生的糖是这个生长控制过程的一个组成部分，既是能量来源，也是生长目标区域的信号分子。植物激素生长素作为一种信号分子和生长发育过程的驱动程序具有类似的功能。在这里，我们表明，不仅两者协同作用，而且生长素代谢本身受游离糖的可用性调节。糖对主要生长素吲哚-3-乙酸（IAA）的生物合成和降解的调节需要改变与IAA生物合成途径相关的多个基因和代谢物的表达。诱导还涉及最近描述的中央调控因子PHYTOCHROME-INTERACTING FACTOR转录因子家族的成员。将这三种已知的生长调节因子联系起来，为对不断变化的环境的动态协调反应提供了一个模型。
Plants are necessarily highly competitive and have finely tuned mechanisms to adjust growth and development in accordance with opportunities and limitations in their environment. Sugars from photosynthesis form an integral part of this growth control process, acting as both an energy source and as signaling molecules in areas targeted for growth. The plant hormone auxin similarly functions as a signaling molecule and a driver of growth and developmental processes. Here, we show that not only do the two act in concert but that auxin metabolism is itself regulated by the availability of free sugars. The regulation of the biosynthesis and degradation of the main auxin, indole-3-acetic acid (IAA), by sugars requires changes in the expression of multiple genes and metabolites linked to several IAA biosynthetic pathways. The induction also involves members of the recently described central regulator PHYTOCHROME-INTERACTING FACTOR transcription factor family. Linking these three known regulators of growth provides a model for the dynamic coordination of responses to a changing environment.