Oecologia

, Volume 184, Issue 1, pp 151–160

Tuned in: plant roots use sound to locate water

  • Monica Gagliano
  • Mavra Grimonprez
  • Martial Depczynski
  • Michael Renton
Behavioral ecology –original research

Abstract

Because water is essential to life, organisms have evolved a wide range of strategies to cope with water limitations, including actively searching for their preferred moisture levels to avoid dehydration. Plants use moisture gradients to direct their roots through the soil once a water source is detected, but how they first detect the source is unknown. We used the model plant Pisum sativum to investigate the mechanism by which roots sense and locate water. We found that roots were able to locate a water source by sensing the vibrations generated by water moving inside pipes, even in the absence of substrate moisture. When both moisture and acoustic cues were available, roots preferentially used moisture in the soil over acoustic vibrations, suggesting that acoustic gradients enable roots to broadly detect a water source at a distance, while moisture gradients help them to reach their target more accurately. Our results also showed that the presence of noise affected the abilities of roots to perceive and respond correctly to the surrounding soundscape. These findings highlight the urgent need to better understand the ecological role of sound and the consequences of acoustic pollution for plant as well as animal populations.

Keywords

Foraging behavior Hydrotropism Moisture sensing Bioacoustics Directional root growth 

Supplementary material

442_2017_3862_MOESM1_ESM.pdf (915 kb)
Supplementary material 1 (PDF 914 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Centre for Evolutionary Biology, School of Animal BiologyUniversity of Western AustraliaCrawleyAustralia
  2. 2.Australian Institute of Marine ScienceCrawleyAustralia
  3. 3.Oceans InstituteUniversity of Western AustraliaCrawleyAustralia
  4. 4.School of Plant BiologyUniversity of Western AustraliaCrawleyAustralia

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