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Asymmetric distribution of cytokinins determines root hydrotropism in Arabidopsis thaliana

细胞分裂素的不对称分布决定拟南芥的根系亲水性

关键词:
来源:
Cell Research期刊
全文链接1:
http://agri.ckcest.cn/topic/downloadFile/3d922f77-0d32-4198-8503-d5e61fe6ea0d
全文链接2:
https://www.nature.com/articles/s41422-019-0239-3
类型:
学术文献
语种:
英语
原文发布日期:
2019-10-10
摘要:
The phenomenon of plant root tips sensing moisture gradient in soil and growing towards higher water potential is designated as root hydrotropism, which is critical for plants to survive when water is a limited factor. Molecular mechanisms regulating such a fundamental process, however, are largely unknown. Here we report our identification that cytokinins are key signaling molecules directing root growth orientation in a hydrostimulation (moisture gradient) condition. Lower water potential side of the root tip shows more cytokinin response relative to the higher water potential side. Consequently, two cytokinin downstream type-A response regulators, ARR16 and ARR17, were found to be up-regulated at the lower water potential side, causing increased cell division in the meristem zone, which allows the root to bend towards higher water potential side. Genetic analyses indicated that various cytokinin biosynthesis and signaling mutants, including the arr16 arr17 double mutant, are significantly less responsive to hydrostimulation. Consistently, treatments with chemical inhibitors interfering with either cytokinin biosynthesis or cell division completely abolished root hydrotropic response. Asymmetrically induced expression of ARR16 or ARR17 effectively led to root bending in both wild-type and miz1, a previously known hydrotropism-defective mutant. These data demonstrate that asymmetric cytokinin distribution is a primary determinant governing root hydrotropism.
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