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

Article


Tavakkoli, Ehsan, Fatehi, Foad, Coventry, Stewart, 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. https://doi.org/10.1093/jxb/erq422
Article Title

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

ERA Journal ID2604
Article CategoryArticle
AuthorsTavakkoli, Ehsan (Author), Fatehi, Foad (Author), Coventry, Stewart (Author), Rengasamy, Pichu (Author) and McDonald, Glenn K. (Author)
Journal TitleJournal of Experimental Botany
Journal Citation62 (6), pp. 2189-2203
Number of Pages15
Year2011
PublisherOxford University Press
Place of PublicationOxford, United Kingdom
ISSN0022-0957
1460-2431
Digital Object Identifier (DOI)https://doi.org/10.1093/jxb/erq422
Web Address (URL)http://jxb.oxfordjournals.org/content/62/6/2189.full.pdf+html
Abstract

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
grown.

Keywordsbarley; chloride; salinity; sodium; specific ion toxicity; tolerance
ANZSRC Field of Research 2020300199. Agricultural biotechnology not elsewhere classified
410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
300404. Crop and pasture biochemistry and physiology
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsUniversity of Adelaide
Institution of OriginUniversity of Southern Queensland
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