JXB Advance Access originally published online on February 5, 2007
Journal of Experimental Botany 2007 58(5):1219-1229; doi:10.1093/jxb/erl293
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RESEARCH PAPER |
Salt tolerance in a Hordeum marinum–Triticum aestivum amphiploid, and its parents
1School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
2CRC for Plant-based Management of Dryland Salinity, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
3School of Agriculture and Wine, The University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia
* To whom correspondence should be addressed. E-mail: tdcolmer{at}cyllene.uwa.edu.au
Growth, grain production, and physiological traits were evaluated for Hordeum marinum, Triticum aestivum (cv. Chinese Spring), and a H. marinum–T. aestivum amphiploid, when exposed to NaCl treatments in a nutrient solution. H. marinum was more salt tolerant than T. aestivum and the amphiploid was intermediate, both for vegetative growth and relative grain production. H. marinum was best able to ‘exclude’ Na+ and Cl–, particularly at high external NaCl. At 300 mM NaCl, concentrations of Na+ (153 µmol g–1 dry mass) and Cl– (75 µmol g–1 dry mass) in the youngest fully-expanded leaf blade of H. marinum were, respectively, only 7% and 4% of those in T. aestivum; and in the amphiplolid the Na+ and Cl– concentrations were 39% and 36% of those in T. aestivum. Glycinebetaine and proline concentrations in the youngest fully-expanded leaf blade of plants exposed to 200 mM NaCl were highest in H. marinum (128 and 60 µmol g–1 dry mass, respectively), lowest in T. aestivum (85 and 37 µmol g–1 dry mass), and intermediate in the amphiploid (108 and 54 µmol g–1 dry mass). Thus, salt tolerance of H. marinum was expressed in the H. marinum–T. aestivum amphiploid.
Key words: Glycinebetaine, halophyte, ion ‘exclusion’, leaf Cl–, leaf K+, leaf Na+, proline, salinity tolerance, sap osmotic potential, sea barleygrass, Triticeae, wheat, wide hybridization, wild relative
Received 24 August 2006; Revised 28 November 2006 Accepted 4 December 2006
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