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

Author

Listed:
  • Jinke Chang

    (Lanzhou University
    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
    Lanzhou University
    Guangzhou University)

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.

Suggested Citation

  • Jinke Chang & Xiaopeng Li & Juan Shen & Jun Hu & Liangfan Wu & Xueyao Zhang & Jia Li, 2024. "Defects in the cell wall and its deposition caused by loss-of-function of three RLKs alter root hydrotropism in Arabidopsis thaliana," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46889-2
    DOI: 10.1038/s41467-024-46889-2
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