Genetic variation in the root growth response of barley genotypes to salinity stress

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dc.contributor.authorShelden, M.
dc.contributor.authorRoessner, U.
dc.contributor.authorSharp, R.
dc.contributor.authorTester, M.
dc.contributor.authorBacic, A.
dc.contributor.organisationAustralian Centre for Plant Functional Genomics (ACPFG)
dc.date.issued2013
dc.description.abstractWe aimed to identify genetic variation in root growth in the cereal crop barley (Hordeum vulgare L.) in response to the early phase of salinity stress. Seminal root elongation was examined at various concentrations of salinity in seedlings of eight barley genotypes consisting of a landrace, wild barley and cultivars. Salinity inhibited seminal root elongation in all genotypes, with considerable variation observed between genotypes. Relative root elongation rates were 60–90% and 30–70% of the control rates at 100 and 150 mM NaCl, respectively. The screen identified the wild barley genotype CPI71284–48 as the most tolerant, maintaining root elongation and biomass in response to salinity. Root elongation was most significantly inhibited in the landrace Sahara. Root and shoot Na+ concentrations increased and K+ concentrations decreased in all genotypes in response to salinity. However, the root and shoot ion concentrations did not correlate with root elongation rates, suggesting that the Na+ and K+ concentrations were not directly influencing root growth, at least during the early phase of salt stress. The identification of genetic diversity in root growth responses to salt stress in barley provides important information for future genetic, physiological and biochemical characterisation of mechanisms of salinity tolerance.
dc.description.statementofresponsibilityMegan C. Shelden, Ute Roessner, Robert E. Sharp, Mark Tester and Antony Bacic
dc.identifier.citationFunctional Plant Biology: an international journal of plant function, 2013; 40(5):516-530
dc.identifier.doi10.1071/FP12290
dc.identifier.issn1445-4408
dc.identifier.issn1445-4416
dc.identifier.orcidShelden, M. [0000-0002-7203-3763]
dc.identifier.urihttp://hdl.handle.net/2440/79123
dc.language.isoen
dc.publisherC S I R O Publishing
dc.rights© CSIRO 2013
dc.source.urihttps://doi.org/10.1071/fp12290
dc.subjectabiotic stress
dc.subjectcereals
dc.subjectosmotic stress
dc.subjectroot elongation
dc.subjectsalt tolerance
dc.subjectseminal roots.
dc.titleGenetic variation in the root growth response of barley genotypes to salinity stress
dc.typeJournal article
pubs.publication-statusPublished

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