Faculty of Bioresources and Environmental Sciences; Ishikawa Prefectural University; Ishikawa, Japan.
Plant Signal Behav. 2013 Apr;8(4):e23509. doi: 10.4161/psb.23509. Epub 2013 Jan 18.
Auxins and brassinosteroids are essential phytohormones that synergistically regulate physiological and developmental processes in plants. Previously, we demonstrated that auxins stimulate brassinosteroid perception by regulating the level of brassinosteroid receptor in rice. Here we showed that auxin treatment increased expression of the Arabidopsis brassinosteroid receptor gene BRI1. The promoter of BRI1 has an auxin-response element that is targeted by auxin-response factor transcription factors. Auxin pretreatment increased the sensitivity to brassinosteroids of brassinosteroid-responsive genes. Although multilevel interactions between auxins and brassinosteroids have previously been reported, our findings suggest a possibility that auxins control the degree of brassinosteroid perception by regulating the expression of gene for brassinosteroid receptor, and this phenomenon is conserved between monocots (rice) and dicots (Arabidopsis).
生长素和油菜素内酯是植物中重要的植物激素,它们协同调节生理和发育过程。以前,我们证明生长素通过调节水稻中油菜素内酯受体的水平来刺激油菜素内酯的感知。在这里,我们发现生长素处理增加了拟南芥油菜素内酯受体基因 BRI1 的表达。BRI1 的启动子具有生长素反应元件,该元件是由生长素反应因子转录因子靶向的。生长素预处理增加了对油菜素内酯响应基因的敏感性。虽然以前已经报道了生长素和油菜素内酯之间的多层次相互作用,但我们的发现表明,生长素通过调节油菜素内酯受体基因的表达来控制油菜素内酯感知的程度,这种现象在单子叶植物(水稻)和双子叶植物(拟南芥)之间是保守的。