Plant Physiol. Drug Metab Dispos
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Plant Physiology 75:281-284 (1984)
© 1984 American Society of Plant Biologists

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Articles

Salinity Effects on Water Potential Components and Bulk Elastic Modulus of Alternanthera philoxeroides (Mart.) Griseb. 1

Jorge A. Bolaños2 and David J. Longstreth

Department of Botany, Louisiana State University, Baton Rouge, Louisiana 70803

Pressure volume curves for Alternanthera philoxeroides (Mart.) Griseb. (alligator weed) grown in 0 to 400 millimolar NaCl were used to determine water potential ({Psi}), osmotic potential ({psi}s), turgor potential ({psi}p) and the bulk elastic modulus ({varepsilon}) of shoots at different tissue water contents. Values of {psi}s decreased with increasing salinity and tissue {Psi} was always lower than rhizosphere {Psi}. The relationship between {psi}p and tissue water content changed because {varepsilon} increased with salinity. As a result, salt-stressed plants had larger ranges of positive turgor but smaller ranges of tissue water content over which {psi}p was positive. To our knowledge, this is the first report of such a salinity effect on {varepsilon} in higher plants. These increases in {varepsilon} with salinity provided a mechanism by which a large difference between plant {Psi} and rhizosphere {Psi}, the driving force for water uptake, could be produced with relatively little water loss by the plant. A time-course study of response after salinization to 400 millimolar NaCl showed {Psi} was constant within 1 day, {psi}s and {psi}p continued to change for 2 to 4 days, and {varepsilon} continued to change for 4 to 12 days. Changes in {varepsilon} modified the capacity of alligator weed to maintain a positive water balance and consideration of such changes in other species of higher plants should improve our understanding of salt stress.

2 Present address: Department of Land, Air, and Water Resources, University of California, Davis, CA 95616.

1 Supported by United States Department of Agriculture, Science and Education Administration Competitive Research Grants Office Grant No. 59-2221-1-1-755-0 and a Department of Energy Institutional Agreement Program Grant through the LSU Center for Energy Studies.






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Copyright © 1984 by the American Society of Plant Biologists