Root growth responses to mechanical impedance are regulated by a network of ROS, ethylene and auxin signalling in Arabidopsis.
Root growth responses to mechanical impedance are regulated by a network of ROS, ethylene and auxin signalling in Arabidopsis.
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DOI：
10.1111/nph.17180
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发表时间：
2021-07
期刊：
影响因子：
--
通讯作者：
Lindsey K
中科院分区：
文献类型：
--
作者：
Jacobsen AGR;Jervis G;Xu J;Topping JF;Lindsey K
根系的生长和发育受植物生长基质的机械性质的影响。机械阻抗，如压实的土壤，可以减少根伸长和限制作物生产力。为了更好地了解植物根系对机械阻抗胁迫的反应机制，我们研究了拟南芥在体外对人工根屏障系统的根转录组和激素信号转导反应的变化。我们证明，在遇到障碍，减少拟南芥根的生长和特征的“阶梯状”的生长模式是由于细胞伸长减少与信号基因表达的变化。来自RNA测序的数据结合报告细胞系和突变体研究确定了活性氧、乙烯和生长素信号在屏障反应中的重要作用。我们提出了一个模型，在该模型中，机械阻抗的早期反应包括活性氧信号与乙烯和生长素的反应，以介导根生长的变化。乙烯反应的抑制允许响应于根阻抗的生长得到改善，这一观察结果可能为未来的作物育种计划提供信息。另见Del Bianco & Kepinski 231：8-10对这篇文章的评论。
The growth and development of root systems is influenced by mechanical properties of the substrate in which the plants grow. Mechanical impedance, such as by compacted soil, can reduce root elongation and limit crop productivity. To understand better the mechanisms involved in plant root responses to mechanical impedance stress, we investigated changes in the root transcriptome and hormone signalling responses of Arabidopsis to artificial root barrier systems in vitro. We demonstrate that upon encountering a barrier, reduced Arabidopsis root growth and a characteristic ‘step‐like’ growth pattern is due to a reduction in cell elongation associated with changes in signalling gene expression. Data from RNA‐sequencing combined with reporter line and mutant studies identified essential roles for reactive oxygen species, ethylene and auxin signalling during the barrier response. We propose a model in which early responses to mechanical impedance include reactive oxygen signalling integrated with ethylene and auxin responses to mediate root growth changes. Inhibition of ethylene responses allows improved growth in response to root impedance, an observation that may inform future crop breeding programmes. See also the Commentary on this article by Del Bianco & Kepinski 231: 8–10.
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