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Nature Plants:可利用氮形态对于生长素介导的根分枝影响

已有 382 次阅读 2020-9-16 07:52 |个人分类:每日摘要|系统分类:论文交流

Auxin-mediated root branching is determined by the form of available nitrogen

第一作者Markus Meier

第一单位德国莱布尼兹植物遗传与作物研究所

通讯作者Nicolaus von Wirén


 Abstract 


背景回顾To improve water and nutrient acquisition from the soil, plants can modulate their root system architecture.


提出问题:Despite the importance of changes in root architecture to exploit local nutrient patches occurring in heterogenous soils or after placed fertilization, mechanisms integrating external nutrient signals into the root developmental programme remain poorly understood.


主要发现:Here, we show that local ammonium supply stimulates the accumulation of shoot-derived auxin in the root vasculature and promotes lateral root emergence to build a highly branched root system.


结果:Activities of pH and auxin reporters indicate that ammonium uptake mediated by ammonium transporters acidifies the root apoplast, which increases pH-dependent import of protonated auxin into cortical and epidermal cells overlaying lateral root primordia, and subsequently promotes their emergence from the parental root. Thereby, ammonium-induced and H+-ATPase-mediated acidification of the apoplast allows auxin to bypass the auxin importers AUX1 and LAX3. In nitrogen-deficient plants, auxin also accumulates in the root vasculature but a more alkaline apoplast leads to retention of auxin in these tissues and prevents lateral root formation.


结论:Our study highlights the impact of externally available nitrogen forms on pH-dependent radial auxin mobility and its regulatory function in organ development.


 摘  要 



植物为了增强从土壤中获取水分和营养的能力,通常会调整其根系结构。尽管对于植物来说,根系结构的改变对于充分利用异质土壤或施肥之后所造成的局部养分十分重要,但植物如何将外部养分信号整合到根系发育程序中,我们对其还知之甚少。本文中,作者发现局部的铵盐供应会刺激来自于茎的生长素在根维管组织中积累,从而促进侧根的形成,最后建成一个高度分枝的根系统。pH活性和生长素报告显示,铵转运蛋白介导的铵吸收会酸化根质外体,从而增加依赖于pH的质子化生长素向覆盖侧根原基的皮质和表皮细胞的运输,并促进其在上级根中出现。因此,铵盐诱导的和H+-ATPase介导的质外体酸化使得生长素能够绕过生长素内流转运蛋白AUX1和LAX3。在氮缺乏的植株中,生长素同样会在根的维管组织中积累,但是一个更加碱化的质外体环境使得生长素一直保留在了这些组织中,从而导致侧根不能形成。本文的研究揭示了外部环境的可利用氮形态对于依赖于pH的生长素径向迁移以及后续器官发育调控的影响。


 通讯作者 


**Nicolaus von Wirén**


研究方向:

植物对于养分的感应;

金属和铵在植物膜上的运输;

养分与植物激素之间的互作;

养分对根系结构的影响;

农作物的养分效率机制。


doi: 10.1038/s41477-020-00756-2


Journal: Nature Plants

Published date: September 011, 2020



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