Salt tolerance in the halophyte Suaeda maritima L.Dum.; abscisic acid concentrations in response to constant and altered salinity
1988
Clipson, N.J.W. | Lachno, D.R. | Flowers, T.J.
Endogenous abscisic acid contents were measured by gas-liquid chromatography in shoots of Suaeda maritima growing both in the steady state over a range of salinities and over a time-course following an increase in the culture solution salinity of between approximately 100 and 400 mol m-3 NaCl. Insteady-state plants, the ABA content was maximal in the absence of salt at 41 ng g-1 fr. wt., declining to a minimum at 200 mol m-3 NaCl of 24 ng g-1 fr. wt.Increase of culture solution salinity resulted in a marked increase in shoot ABA which was maximal after 6 h or 24 h in plants previously growing at 200 molm-3 NaCl and in the absence of salt, respectively. Additionally, culture solution water potentials were lowered by 1.0 MPa (equivalent to raising the salt concentration by around 200 mol m-3); this resulted in a similar increase in endogenous ABA content to that brought about by an iso-osmotic salt increase. Results are discussed in relation to the possible role of ABA in halophyte salt tolerance mechanisms.
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