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Publication Type J
Authors Garthwaite, A. J., R. von Bothmer and T. D. Colmer
Title Salt tolerance in wild Hordeum species is associated with restricted entry of Na+ and Cl- into the shoots
Source Journal of Experimental Botany
Author Keywords asparagine; barley (Hordeum vulgare); Cl-; glycinebetaine; K+; Na+; proline; osmotic potential; salt tolerance; Triticeae; wild relatives comparative physiology; genus hordeum; water-content; thinopyrum-bessarabicum; solute accumulation; genetic-resources; plant responses; ion relations; d-genome; wheat
Abstract Eight wild Hordeum species: H. bogdanii, H. intercedens, H. jubatum, H. lechleri, H. marinum, H. murinum, H. patagonicum, and H. secalinum, and cultivated barley (H. vulgare) were grown in nutrient solution containing 0.2 (control), 150, 300, or 450 mol m(-3) NaCl. In saline conditions, the wild Hordeum species (except H. murinum) had better Na+ and Cl- 'exclusion', and maintained higher leaf K+, compared with H. vulgare. For example, at 150 mol m(-3) NaCl, the K+:Na+ in the youngest, fully expanded leaf blades of the wild Hordeum species was, on average, 5.2 compared with 0.8 in H. vulgare. In H. marinum grown in 300 mol m(-3) NaCl, K+ contributed 35% to leaf Psi(pi), whereas Na+ and Cl- accounted for only 6% and 10%, respectively. By comparison, in H. vulgare grown at 300 mol m(-3) NaCl, K+ accounted for 19% and Na+ and Cl- made up 21% and 25% of leaf Psi(pi), respectively. At 300 mol m(-3) NaCl, glycinebetaine and proline together contributed almost 15% to Psi(pi) in the expanding leaf blades of H. marinum, compared with 8% in H. vulgare. Decreased tissue water content under saline conditions made a substantial contribution to declines in leaf Psi(pi) in the wild Hordeum species, but not in H. vulgare. A number of the wild Hordeum species were markedly more salt tolerant than H. vulgare. H. marinum and H. intercedens, as examples, had relative growth rates 30% higher than H. vulgare in 450 mol m(-3) NaCl. Hordeum vulgare also suffered up to 6-fold more dead leaf material (as a proportion of shoot dry mass) than the wild Hordeum species. Thus, several salt-tolerant wild Hordeum species were identified, and these showed an exceptional capacity to 'exclude' Na+ and Cl- from their shoots.
Author Address Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia. Univ Western Australia, CRC Plant Based Management Dryland Salin, Crawley, WA 6009, Australia. Swedish Univ Agr Sci, Dept Crop Sci, Genet Resources Grp, SE-23053 Alnarp, Sweden. Colmer, TD, Univ Western Australia, Sch Plant Biol, 35 Stirling Highway, Crawley, WA 6009, Australia. tdcolmer@cyllene.uwa.edu.au
29-Character Source Abbreviation J. Exp. Bot.
Publication Date Sep
Year Published 2005
Volume 56
Issue 419
Beginning Page 2365-2378
Unique Article Identifier ISI:000231363000007
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