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- W2083673722 abstract "Pressure volume curves for Alternanthera philoxeroides (Mart.) Griseb. (alligator weed) grown in 0 to 400 millimolar NaCl were used to determine water potential (Ψ), osmotic potential (ψs), turgor potential (ψp) and the bulk elastic modulus (ε) of shoots at different tissue water contents. Values of ψs decreased with increasing salinity and tissue Ψ was always lower than rhizosphere Ψ. The relationship between ψp and tissue water content changed because ε increased with salinity. As a result, salt-stressed plants had larger ranges of positive turgor but smaller ranges of tissue water content over which ψp was positive. To our knowledge, this is the first report of such a salinity effect on ε in higher plants. These increases in ε with salinity provided a mechanism by which a large difference between plant Ψ and rhizosphere Ψ, 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 Ψ was constant within 1 day, ψs and ψp continued to change for 2 to 4 days, and ε continued to change for 4 to 12 days. Changes in ε 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." @default.
- W2083673722 created "2016-06-24" @default.
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- W2083673722 date "1984-06-01" @default.
- W2083673722 modified "2023-10-18" @default.
- W2083673722 title "Salinity Effects on Water Potential Components and Bulk Elastic Modulus of <i>Alternanthera philoxeroides</i> (Mart.) Griseb." @default.
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- W2083673722 doi "https://doi.org/10.1104/pp.75.2.281" @default.
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