Additive effects of Na+ and Cl– ions on barley growth under salinity stress

Tavakkoli, Ehsan and Fatehi, Foad and Coventry, Stewart and Rengasamy, Pichu and McDonald, Glenn K. (2011) Additive effects of Na+ and Cl– ions on barley growth under salinity stress. Journal of Experimental Botany, 62 (6). pp. 2189-2203. ISSN 0022-0957

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Soil salinity affects large areas of the world’s cultivated land, causing significant reductions in crop yield. Despite
the fact that most plants accumulate both sodium (Na+) and chloride (Cl–) ions in high concentrations in their shoot
tissues when grown in saline soils, most research on salt tolerance in annual plants has focused on the toxic effects
of Na+ accumulation. It has previously been suggested that Cl– toxicity may also be an important cause of growth
reduction in barley plants. Here, the extent to which specific ion toxicities of Na+ and Cl– reduce the growth of barley grown in saline soils is shown under varying salinity treatments using four barley genotypes differing in their salt tolerance in solution and soil-based systems. High Na+, Cl–, and NaCl separately reduced the growth of barley, however, the reductions in growth and photosynthesis were greatest under NaCl stress and were mainly additive of the effects of Na+ and Cl– stress. The results demonstrated that Na+ and Cl– exclusion among barley genotypes are independent mechanisms and different genotypes expressed different combinations of the two mechanisms. High concentrations of Na+ reduced K+ and Ca2+ uptake and reduced photosynthesis mainly by reducing stomatal conductance. By comparison, high Cl– concentration reduced photosynthetic capacity due to non-stomatal effects:
there was chlorophyll degradation, and a reduction in the actual quantum yield of PSII electron transport which was
associated with both photochemical quenching and the efficiency of excitation energy capture. The results also
showed that there are fundamental differences in salinity responses between soil and solution culture, and that the
importance of the different mechanisms of salt damage varies according to the system under which the plants were

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This paper is available online free of all access charges (see for further details. Available online 27 Jan 2011
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 19 Jul 2011 12:15
Last Modified: 24 Aug 2014 23:29
Uncontrolled Keywords: barley; chloride; salinity; sodium; specific ion toxicity; tolerance
Fields of Research : 10 Technology > 1001 Agricultural Biotechnology > 100199 Agricultural Biotechnology not elsewhere classified
05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820501 Barley
Identification Number or DOI: 10.1093/jxb/erq422

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