Moderate water stress in rice induces rhizosheath formation associated with abscisic acid and auxin responses
Moderate water stress in rice induces rhizosheath formation associated with abscisic acid and auxin responses
复制标题
水稻中度水分胁迫诱导与脱落酸和生长素反应相关的根鞘形成
DOI：
10.1093/jxb/eraa021
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发表时间：
2020
影响因子：
6.9
通讯作者：
Weifeng Xu
中科院分区：
文献类型：
--
作者：
Yingjiao Zhang;Huan Du;Yao Gui;Feiyun Xu;Jianping Liu;Jianhua Zhang;Weifeng Xu
已知根鞘有益于许多植物的抗旱性，但水稻植物根鞘形成的调节尚不清楚。在这里，我们研究了不同水稻品种和根毛突变体的根鞘形成。我们的结果表明，水稻适度的水分胁迫会诱导根鞘形成。中等水分胁迫下，水稻根鞘土壤孔隙度和含水量均高于水稻土体。此外，在中等水分胁迫下，短根毛突变体的根鞘形成低于野生型水稻。此外，转录组结果表明脱落酸（ABA）和生长素参与根鞘形成中的根和根毛反应。此外，在中度水分胁迫下，阻断野生型和最短根毛突变体inrhl1-1中的ABA和生长素途径，根鞘形成和根毛长度显着减少。然而，野生型植物比 didrhl1-1 保持了更高的根 ABA 含量、根基叶生长素运输、根毛长度和根鞘数量。我们的研究结果表明，水稻适度的水分胁迫可通过调节ABA和生长素反应来调节根和根毛的生长，从而诱导根鞘形成，这可用于培育抗旱水稻品种。
The rhizosheath is known to be beneficial for drought resistance in many plants, but the regulation of rhizosheath formation in rice plants is unclear. Here, we investigate rhizosheath formation in different rice varieties and root hair mutants. Our results showed that moderate water stress in rice induced rhizosheath formation. The soil porosity and water content were higher in the rice rhizosheath than in the rice bulk soil under moderate water stress. Additionally, rhizosheath formation in short root hair mutants was lower than in wild-type rice under moderate water stress. Moreover, transcriptomic results indicated that abscisic acid (ABA) and auxin were involved in root and root hair responses in rhizosheath formation. Further, blocking ABA and auxin pathways in wild type and inrhl1-1,the shortest root hair mutant, rhizosheath formation and root hair length were significantly decreased under moderate water stress. However, wild type plants maintained a higher root ABA content, root basipetal auxin transport, root hair length, and amount of rhizosheath than didrhl1-1. Our results suggest that moderate water stress in rice induces rhizosheath formation by modulating the ABA and auxin responses to regulate root and root hair growth, which may be used to breed rice varieties resistant to drought.