Salinity effects on water potential components and bulk elastic modulus of Alternanthera philoxeroides (Mart. ) Griseb

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.75.2.281· OSTI ID:6134931

Bolanos, J A; Longstreth, D J

Pressure volume curves for Alternanthera philoxeroides (Mart.) Grixeb. (alligator weed) grown in 0 to 400 millimolar NaCl were used to determine water potential (PSI), osmotic potential (psi/sub s/), turgor potential (psi/sub p/) and the bulk elastic modulus (element of) of shoots at different tissue water contents. Values of psi decreased with increasing salinity and tissue PSI was always lower than rhizosphere PSI. The relationship between psi/sub p/ and tissue water content changed because element of increased with salinity. As a results, salt-stressed plants had larger ranges of positive turgor but smaller ranges of tissue water content over which psi/sub p/ was positive. To our knowledge, this is the first report of such a salinity effect on element of in higher plants. These increases in element of 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 with 1 day, psi/sub s/ and psi/sub p/ continued to change for 2 to 4 days, and element of continued to change for 4 to 12 days. Changes in element of 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. 24 references, 6 figures.

• Research Organization: Louisiana State Univ., Baton Rouge
• OSTI ID: 6134931
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 75:2; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
BODY
DIFFUSION
DOSE-RESPONSE RELATIONSHIPS
ELASTICITY
HYDROGEN COMPOUNDS
LOSSES
MECHANICAL PROPERTIES
OSMOSIS
OXYGEN COMPOUNDS
PLANT TISSUES
PLANTS
SALINITY
TENSILE PROPERTIES
TISSUES
UPTAKE
WATER
WEEDS