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Science:响应于外界水流通量的激素再分配决定了根的分枝模式

已有 824 次阅读 2022-11-27 17:22 |个人分类:每日摘要|系统分类:论文交流

Hydraulic flux–responsive hormone redistribution determines root branching

第一作者POONAM MEHRA

第一单位英国诺丁汉大学

通讯作者MALCOLM J. BENNETT


 Abstract 

背景回顾:Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when roots lose contact with water. 


结果1-脱落酸响应Here, we show that xerobranching is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. 


结果2-生长素移动Closure of these intercellular pores disrupts the inward movement of the hormone signal auxin, blocking lateral root branching. 


结果3-复水Once root tips regain contact with moisture, the abscisic acid response rapidly attenuates. 


结论Our study reveals how roots adapt their branching pattern to heterogeneous soil water conditions by linking changes in hydraulic flux with dynamic hormone redistribution.


image.png

Dynamic hormone redistribution determines root branching or xerobranching response to external water availability.


 摘 要 

植物的根在其分枝模式上存在极强的可塑性,从而能够在非均匀分布的可利用资源条件下高效获取土壤水分等物质。干分枝响应在根系面对缺水时,抑制侧根的形成。本文中,作者发现植物的干分枝响应受到来自于韧皮部植物激素脱落酸的径向移动控制,其通过胞间连丝扰乱内外层细胞间的通讯。这些细胞间孔的关闭阻碍了激素信号生长素的向内运输,从而阻断了侧根分枝形成。一旦根尖重新感知到湿度,脱落酸响应迅速减弱。本文的研究揭示了植物的根如何通过分模式快速响应非均匀分布的土壤水分条件,将外界环境的水流通量变化与植物体内的激素动态再分配联系到了一起。




** Malcolm Bennett **


个人简介:

1978-1983年,利物浦大学,学士;

1983-1986年,利物浦大学,博士。


研究方向:植物的根生长与发育。


doi: https://doi.org/10.1126/science.add3771


Journal: Science

Published date: November 17, 2022


Cite:
Poonam Mehra, Bipin K. Pandey, Dalia Melebari, Jason Banda, Nicola Leftley, Valentin Couvreur, James Rowe, Moran Anfang, Hugues De Gernier, Emily Morris, Craig J. Sturrock, Sacha J. Mooney, Ranjan Swarup, Christine Faulkner, Tom Beeckman, Rishikesh P. Bhalerao, Eilon Shani, Alexander M. Jones, Ian C. Dodd, Robert E. Sharp, Ari Sadanandom, Xavier Draye, Malcolm J. Bennett. Hydraulic flux–responsive hormone redistribution determines root branching. Science, 2022, 378(6621): 762-768. DOI: 10.1126/science.add3771



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