Abscisic acid mediates barley rhizosheath formation under mild soil drying by promoting root hair growth and auxin response

Zhang, Y. and Xu, F. and Ding, Y. and Du, H. and Zhang, Q. and Dang, X. and Cao, Y. and Dodd, I.C. and Xu, W. (2021) Abscisic acid mediates barley rhizosheath formation under mild soil drying by promoting root hair growth and auxin response. Plant, Cell and Environment. ISSN 0140-7791

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Abstract

Soil drying enhances root ABA accumulation and rhizosheath formation, but whether ABA mediates rhizosheath formation is unclear. Here, we used the ABA-deficient mutant Az34 to investigate molecular and morphological changes by which ABA could affect rhizosheath formation. Mild soil drying with intermittent watering increased rhizosheath formation by promoting root and root hair elongation. Attenuated root ABA accumulation in Az34 barley constrained the promotion of root length and root hair length by drying soil, such that Az34 had a smaller rhizosheath. Pharmacological experiments of adding fluridone (an ABA biosynthesis inhibitor) and ABA to drying soil restricted and enhanced rhizosheath formation respectively in Az34 and wild-type Steptoe barley. RNA sequencing suggested that ABA accumulation mediates auxin synthesis and responses and root and root hair elongation in drying soil. In addition, adding indole-3-acetic acid (IAA) to drying soil increased rhizosheath formation by promoting root and root hair elongation in Steptoe and Az34 barley. Together, these results show that ABA accumulation induced by mild soil drying enhance barley rhizosheath formation, which may be achieved through promoting auxin response. © 2021 John Wiley & Sons Ltd.

Item Type:
Journal Article
Journal or Publication Title:
Plant, Cell and Environment
Additional Information:
This is the peer reviewed version of the following article:Zhang, Y, Xu, F, Ding, Y, et al. Abscisic acid mediates barley rhizosheath formation under mild soil drying by promoting root hair growth and auxin response. Plant Cell Environ. 2021; 1– 11. https://doi.org/10.1111/pce.14036 which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1111/pce.14036 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1314
Subjects:
ID Code:
153385
Deposited By:
Deposited On:
01 Apr 2021 15:35
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jun 2021 09:08