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Mechanisms of Salt Tolerance in Nonhalophytes

Mechanisms of Salt Tolerance in Nonhalophytes Mechanisms of salt tolerance in halophytes which grow rapidly at high salinity have been reviewed recently in this series by Flowers et al (34). Here we review mechanisms of tolerance in nonhalophytes, restricting ourselves to ion and water relations and omitting other aspects such as hormonal controls. Responses of crops to salinity in terms of yield have been reviewed by Maas & Hoffman (83). There are very large differences between species, e.g. a 50 percent yield reduction occurs for beans at 60 m M and for sugar beet at 260 mM monovalent salts [calculated from (83)]. The growth response of cultivated species to salinity overlaps with that of halophytes (Figure 1), and this is not surprising since some species, such as sugar beet, have halo­ phytic ancestors. Beta vulgaris ssp. maritima is found in salt marshes in association with Atriplex hastata and Suaeda fructicosa ( 14). We have adopted the ecological definition of halophytes used by Jennings (65): "the native flora of saline soils," and have assumed that soils in this context contain solutions with a IT of at least 3.3 bar, being equivalent to 70 mM monovalent salts [calculated from (106)]. It has been recognized since the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Mechanisms of Salt Tolerance in Nonhalophytes

Annual Review of Plant Biology , Volume 31 (1) – Jun 1, 1980

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Publisher
Annual Reviews
Copyright
Copyright 1980 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
DOI
10.1146/annurev.pp.31.060180.001053
Publisher site
See Article on Publisher Site

Abstract

Mechanisms of salt tolerance in halophytes which grow rapidly at high salinity have been reviewed recently in this series by Flowers et al (34). Here we review mechanisms of tolerance in nonhalophytes, restricting ourselves to ion and water relations and omitting other aspects such as hormonal controls. Responses of crops to salinity in terms of yield have been reviewed by Maas & Hoffman (83). There are very large differences between species, e.g. a 50 percent yield reduction occurs for beans at 60 m M and for sugar beet at 260 mM monovalent salts [calculated from (83)]. The growth response of cultivated species to salinity overlaps with that of halophytes (Figure 1), and this is not surprising since some species, such as sugar beet, have halo­ phytic ancestors. Beta vulgaris ssp. maritima is found in salt marshes in association with Atriplex hastata and Suaeda fructicosa ( 14). We have adopted the ecological definition of halophytes used by Jennings (65): "the native flora of saline soils," and have assumed that soils in this context contain solutions with a IT of at least 3.3 bar, being equivalent to 70 mM monovalent salts [calculated from (106)]. It has been recognized since the

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 1, 1980

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