Photosynthetica 2018, 56(2):549-556 | DOI: 10.1007/s11099-017-0699-y

Effect of salt stress on photosynthesis and physiological parameters of three contrasting barley genotypes

M. Mahlooji1, R. Seyed Sharifi1,*, J. Razmjoo2, M. R. Sabzalian2, M. Sedghi1
1 Department of Agronomy and Plant Breeding, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
2 Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan, Iran

In order to understand the physiological traits important in conferring salt tolerance in three barley genotypes, this study was performed under field conditions with three water salinity levels (2, 10, and 18 dS m-1). High salinity decreased net photosynthetic rate, transpiration rate, and stomatal conductance, K+ concentration, K+:Na+ ratio, and grain yield, but increased electrolyte leakage and Na+ content. Under 10 and 18 dS m-1 salinity, Khatam (salt-tolerant) had the maximum stomatal conductance, K+, K+:Na+ ratio, and the grain yield, and a minimum Na+ content and electrolyte leakage, whereas Morocco (salt-sensitive) had the lowest net photosynthetic rate, stomatal conductance, K+ content, K+:Na+ ratio, and grain yield, and the highest Na+ content and electrolyte leakage. This study showed that tolerant genotypes of barley may avoid Na+ accumulation in aboveground parts, facilitating a higher photosynthetic rate and higher grain yield.

Additional key words: Hordeum vulgare; photosynthesis; gas exchange; salinity

Received: May 21, 2016; Accepted: December 20, 2016; Published: June 1, 2018  Show citation

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Mahlooji, M., Seyed Sharifi, R., Razmjoo, J., Sabzalian, M.R., & Sedghi, M. (2018). Effect of salt stress on photosynthesis and physiological parameters of three contrasting barley genotypes. Photosynthetica, 56(2), 549-556. doi: 10.1007/s11099-017-0699-y
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