Nitrate signaling promotes plant growth by upregulating gibberellin biosynthesis and destabilization of DELLA proteins
第一作者:Lucie Camut
第一单位:斯特拉斯堡大学
第一通讯:Patrick Achard
Abstract
背景回顾:Nitrate, one of the main nitrogen (N) sources for crops, acts as a nutrient and key signaling molecule coordinating gene expression, metabolism, and various growth processes throughout the plant life cycle. It is widely accepted that nitrate-triggered developmental programs cooperate with hormone synthesis and transport to finely adapt plant architecture to N availability. 主要发现:Here, we report that nitrate, acting through its signaling pathway, promotes growth in Arabidopsis and wheat, in part by modulating the accumulation of gibberellin (GA)-regulated DELLA growth repressors. 结果1-硝酸盐-GA-DELLA:We show that nitrate reduces the abundance of DELLAs by increasing GA contents through activation of GA metabolism gene expression. 结果2-DELLA突变体:Consistently, the growth restraint conferred by nitrate deficiency is partially rescued in global-DELLA mutant that lacks all DELLAs. 结果3-硝酸盐促进的细胞增殖与伸长:At the cellular level, we show that nitrate enhances both cell proliferation and elongation in a DELLA-dependent and -independent manner, respectively. 结论:Our findings establish a connection between nitrate and GA signaling pathways that allow plants to adapt their growth to nitrate availability. 摘 要
硝酸盐是作物的主要氮源之一,在植物的整个生命周期中,硝酸盐作为一种养分和关键信号分子,作用于基因表达、代谢和各种生长过程的协调。人们普遍认为,硝酸盐诱导的发育进程和植物激素的合成与运输相互配合,从而使得植物的结构能够更好地适应有效氮。本文中,作者报道了硝酸盐通过其信号转导途径促进拟南芥和小麦的生长,部分是通过调节受赤霉素GA调控的DELLA生长抑制子的积累。作者发现,硝酸盐通过激活GA代谢基因的表达,增加GA的含量,从而降低了DELLAs的丰度。与此一致,缺少所有DELLA的突变体能够部分拯救硝酸盐缺乏所带来的生长抑制。在细胞水平上,作者发现硝酸盐能够以DELLA依赖性和非依赖性的方式,分别促进细胞的增殖和伸长。本文的研究结果建立了硝酸盐和GA信号转导通路之间的关联,这种联系使得植物的生长能够适应有效氮的供应。
通讯作者
** Patrick Achard **
研究方向:不同环境下植物GA响应生长的机制。
doi: https://doi.org/10.1016/j.cub.2021.09.024
Journal: Current Biology
Published date: October 05, 2021
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