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Plant Physiology 88:233-237 (1988)
© 1988 American Society of Plant Biologists

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Environmental and Stress Physiology

Salinity Stress Inhibits Bean Leaf Expansion by Reducing Turgor, Not Wall Extensibility 1

Peter M. Neumann2, Elizabeth Van Volkenburgh and Robert E. Cleland

Department of Botany KB-15, University of Washington, Seattle, Washington 98195

Treatment of bean (Phaseolus vulgaris L.) seedlings with low levels of salinity (50 or 100 millimolar NaCl) decreased the rate of light-induced leaf cell expansion in the primary leaves over a 3 day period. This decrease could be due to a reduction in one or both of the primary cellular growth parameters: wall extensibility and cell turgor. Wall extensibility was assessed by the Instron technique. Salinity did not decrease extensibility and caused small increases relative to the controls after 72 hours. On the other hand, 50 millimolar NaCl caused a significant reduction in leaf bulk turgor at 24 hours; adaptive decreases in leaf osmotic potential (osmotic adjustment) were more than compensated by parallel decreases in the xylem tension potential and the leaf apoplastic solute potential, resulting in a decreased leaf water potential. It is concluded that in bean seedlings, mild salinity initially affects leaf growth rate by a decrease in turgor rather than by a reduction in wall extensibility. Moreover, longterm salinization (10 days) resulted in an apparent mechanical adjustment, i.e. an increase in wall extensibility, which may help counteract reductions in turgor and maintain leaf growth rates.

2 Permanent address: Plant Physiology Laboratory, Faculty of Agricultural Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.

1 Supported by the National Science Foundation, Grant DCB-8517349, to R.E.C. and E.V.V. and a sabbatical leave to P.M.N. from the Technion.






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Copyright © 1988 by the American Society of Plant Biologists