Journal
FUNCTIONAL & INTEGRATIVE GENOMICS
Volume 10, Issue 2, Pages 277-291Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10142-009-0153-8
Keywords
Sodium transport; Barley; H. vulgare ssp spontaneum; Salinity tolerance; Pyrophosphatase
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Funding
- GRDC [UA00090]
- DBT grant (India)
- Institute of International Education (USA)
- ARC
- GRDC
- South Australian Government funding
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Previous work identified the wild barley (Hordeum vulgare ssp. spontaneum) accession CPI-71284-48 as being capable of limiting sodium (Na+) accumulation in the shoots under saline hydroponic growth conditions. Quantitative trait locus (QTL) analysis using a cross between CPI-71284-48 and a selection of the cultivated barley (H. vulgare ssp. vulgare) cultivar Barque (Barque-73, a moderate Na+ excluder) attributed the control of the Na+ exclusion trait from CPI-71284-48 to a single locus on the short arm of chromosome 7H, which was named HvNax3. The locus reduced shoot Na+ accumulation by 10-25% in plants grown in 150 mM NaCl. Markers generated using colinearity with rice and Brachypodium, together with the analysis of introgression lines and F-2 and F-3 families, enabled HvNax3 to be mapped to a 1.3-cM interval. Genes from the corresponding rice and Brachypodium intervals encode 16 different classes of proteins and include several plausible candidates for HvNax3. The potential of HvNax3 to provide a useful trait contributing to salinity tolerance in cultivated barley is discussed.
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