Defects in the cell wall and its deposition caused by loss-of-function of three RLKs alter root hydrotropism in Arabidopsis thaliana

Jinke Chang, Xiaopeng Li, Juan Shen, Jun Hu, Liangfan Wu, Xueyao Zhang and Jia Li ()
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Jinke Chang: Lanzhou University
Xiaopeng Li: Guangzhou University
Juan Shen: Lanzhou University
Jun Hu: Lanzhou University
Liangfan Wu: Lanzhou University
Xueyao Zhang: Lanzhou University
Jia Li: Lanzhou University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Root tips can sense moisture gradients and grow into environments with higher water potential. This process is called root hydrotropism. Here, we report three closely related receptor-like kinases (RLKs) that play critical roles in root hydrotropism: ALTERED ROOT HYDROTROPIC RESPONSE 1 (ARH1), FEI1, and FEI2. Overexpression of these RLKs strongly reduce root hydrotropism, but corresponding loss-of-function mutants exhibit an increased hydrotropic response in their roots. All these RLKs show polar localization at the plasma membrane regions in root tips. The biosynthesis of the cell wall, cutin, and wax (CCW) is significantly impaired in root tips of arh1-2 fei1-C fei2-C. A series of known CCW mutants also exhibit increased root hydrotropism and reduced osmotic tolerance, similar to the characteristics of the triple mutant. Our results demonstrat that the integrity of the cell wall, cutin, and root cap wax mediate a trade-off between root hydrotropism and osmotic tolerance.

Date: 2024
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DOI: 10.1038/s41467-024-46889-2

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