Moderate water stress in rice induces rhizosheath formation associated with abscisic acid and auxin responses. (8th February 2020)

• Record Type: Journal Article
• Authors: Zhang, Yingjiao; Du, Huan; Gui, Yao; Xu, Feiyun; Liu, Jianping; Zhang, Jianhua; Xu, Weifeng
• Editors: Pieruschka, Roland
• Is Part Of: Journal of experimental botany. Volume 71:Number 9(2020)
• Page Start: 2740
• Page End: 2751
• Publication Date: 2020-02-08
• Subjects: ABA -- auxin -- moderate water stress -- rhizosheath formation -- root growth -- root hair; Botany -- Periodicals; Botany, Experimental -- Periodicals; Plant physiology -- Periodicals; 580
• DOI: 10.1093/jxb/eraa021
• Languages: English
• ISSNs: 0022-0957

Abstract

Abstract : Moderate water stress in rice induces rhizosheath formation by modulating the abscisic acid and auxin responses to regulate root and root hair growth. Abstract: 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 in rhl1-1, 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 did rhl1-1 . 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.