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Effect of transient dehydration on absorption of chloride by wheat roots

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Summary

Water potentials (243-1) ranging from −1 to −24 bar were developed in excised roots over 30 min by an air-drying technique. Chloride influx to the roots was measured immediately on rewetting and at intervals up to 24 h. Moderate dehydration (243-2) decreased influx, and active absorption was completely inhibited by severe dehydration (243-3). Influx increased with time after rewetting and after 18 h was similar to that of fresh roots (3.3 – 5.2 μM g-1 h-1).

Similar results were obtained with intact seedlings, although complete recovery from dehydration did not occur within 24 h.

As the water potential of excised roots decreased from −5 to −10 bar, the roots shrank from their original diameter of 0.5 mm to 0.2 mm. They returned to their original diameter on rehydration. re]19730622

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Author notes

  1. P. J. Cole

    Present address: South Australian Department of Agriculture, G.P.O. Box 1671, 5001, Adelaide, South Australia

Authors and Affiliations

  1. Agronomy Department, Waite Agricultural Research Institute, The University of Adelaide, 5064, Glen Osmond, South Australia

    P. J. Cole & A. M. Alston

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  1. P. J. Cole
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  2. A. M. Alston
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Cole, P.J., Alston, A.M. Effect of transient dehydration on absorption of chloride by wheat roots. Plant Soil 40, 243–247 (1974). https://doi.org/10.1007/BF00011429

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  • DOI: https://doi.org/10.1007/BF00011429

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