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Updated: Feb 13, 2026

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Hydrotropism: how roots search for water.

Daniela Dietrich1

  • 1Centre for Plant Integrative Biology and Plant & Crop Sciences, School of Biosciences, University of Nottingham, Nottingham, UK.

Journal of Experimental Botany
|March 13, 2018
PubMed
Summary

Plants use hydrotropism to find water by growing roots towards moisture. This review covers hormonal regulation, perception sites, and the role of hydrotropism in drought adaptation.

Area of Science:

  • Plant Biology
  • Agricultural Science
  • Environmental Science

Background:

  • Fresh water scarcity impacts agriculture.
  • Plant roots are crucial for water uptake and possess adaptive traits like hydrotropism.
  • Hydrotropism guides root growth towards soil moisture gradients.

Purpose of the Study:

  • To review recent advancements in understanding the hormonal regulation of hydrotropism.
  • To discuss progress in identifying hydrotropic perception and response sites.
  • To explore the interaction between hydrotropism and gravitropism and its role in drought acclimatization.

Main Methods:

  • Literature review of recent research on hydrotropism.
  • Analysis of hormonal regulation, including abscisic acid (ABA) and auxin.

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  • Discussion of genetic factors (MIZ1, MIZ2/GNOM) involved in hydrotropism.

    • Main Results:

    • Abscisic acid (ABA) and specific genes are essential for hydrotropism in Arabidopsis thaliana.
    • The role of auxin in hydrotropism is species-dependent.
    • Recent studies are identifying specific sites for water potential gradient perception.

    Conclusions:

    • Hydrotropism is a key adaptive mechanism for plants facing water scarcity.
    • Understanding hydrotropism's hormonal control and perception mechanisms is vital for improving crop resilience.
    • Further research into hydrotropism can inform strategies for drought adaptation in agriculture.