Molecular mechanisms mediating root hydrotropism: what we have observed since the rediscovery of hydrotropism


Roots display directional growth toward moisture in response to a water potential gradient. Root hydrotropism is thought to facilitate plant adaptation to continuously changing water availability. Hydrotropism has not been as extensively studied as gravitropism. However, comparisons of hydrotropic and gravitropic responses identified mechanisms that are unique to hydrotropism. Regulatory mechanisms underlying the hydrotropic response appear to differ among different species. We recently performed molecular and genetic analyses of root hydrotropism in Arabidopsis thaliana. In this review, we summarize the current knowledge of specific mechanisms mediating root hydrotropism in several plant species.

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This work was supported by Grant-in-Aid for Scientific Research (17K07433) from JSPS to YM, and a Grant-in-Aid for Scientific Research on Innovative Areas (no. 18H04962) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan to HT.

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Correspondence to Yutaka Miyazawa.

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Yutaka Miyazawa is the recipient of the BSJ Award for Young Scientist, 2010.

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Miyazawa, Y., Takahashi, H. Molecular mechanisms mediating root hydrotropism: what we have observed since the rediscovery of hydrotropism. J Plant Res 133, 3–14 (2020) doi:10.1007/s10265-019-01153-3

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  • Abscisic acid
  • Auxin
  • Hydrotropism