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Plant and Soil

, Volume 369, Issue 1–2, pp 377–386 | Cite as

Root plasticity maintains growth of temperate grassland species under pulsed water supply

  • Francisco M. Padilla
  • Bart H. J. Aarts
  • Yvonne O. A. Roijendijk
  • Hannie de Caluwe
  • Liesje Mommer
  • Eric J. W. Visser
  • Hans de Kroon
Regular Article

Abstract

Background and aims

The frequency of rain is predicted to change in high latitude areas with more precipitation in heavy, intense events interspersed by longer dry periods. These changes will modify soil drying cycles with unknown consequences for plant performance of temperate species.

Methods

We studied plant growth and root traits of juveniles of four grasses and four dicots growing in a greenhouse, when supplying the same total amount of water given either regular every other day or pulsed once a week.

Results

Pulsed water supply replenished soil moisture immediately after watering, but caused substantial drought stress at the end of the watering cycle, whereas regular watering caused more moderate but consistent drought. Grasses had lower water use efficiency in the pulsed watering compared to regular watering, whereas dicots showed no difference. Both grasses and dicots developed thinner roots, thus higher specific root length, and greater root length in the pulsed watering. Growth of dicots was slightly increased under pulsed watering.

Conclusions

Temperate species coped with pulsed water supply by eliciting two responses: i) persistent shoot growth, most likely by maximizing growth at peaks of soil moisture, thus compensating for slower growth during drought periods; ii) plasticity of root traits related to increased resource uptake. Both responses likely account for subtle improvement of growth under changed water supply conditions.

Keywords

Climate change δ13Water heterogeneity Water use efficiency Specific root length 

Notes

Acknowledgements

We thank Marloes Hendriks and Janneke Ravenek for help with root scanning, the staff of the Experimental Garden (IWWR, FNWI) of the Radboud University Nijmegen for taking care of the plants, Dr. Iván Prieto and three anonymous referees for reviewing earlier drafts. FMP was supported by a postdoc grant of the Spanish Ministry of Education.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Francisco M. Padilla
    • 1
    • 3
  • Bart H. J. Aarts
    • 1
  • Yvonne O. A. Roijendijk
    • 1
  • Hannie de Caluwe
    • 1
  • Liesje Mommer
    • 1
    • 2
  • Eric J. W. Visser
    • 1
  • Hans de Kroon
    • 1
  1. 1.Experimental Plant Ecology, Institute for Water and Wetland ResearchRadboud University NijmegenNijmegenThe Netherlands
  2. 2.Nature Conservation and Plant EcologyWageningen UniversityWageningenThe Netherlands
  3. 3.Departamento de AgronomíaUniversidad de AlmeríaLa CañadaSpain

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