Physiological and Biochemical Evaluation of Barley (Hordeum vulgare L.) under Salinity Stress

Document Type : Original Research

Authors
T. Narimani 1
M. Toorchi 1
A. R. Tarinejad 2
S. A. Mohammadi 1
H. Mohammadi 2
1 Department of Plant Breeding and Biotechnology, Faculty of Agriculture, University of Tabriz, Islamic Republic of Iran.
2 Department of Plant Breeding, Faculty of Agriculture, Azarbaijan Shahid Madani University, Tabriz, Islamic Republic of Iran.
Abstract
This study was conducted to investigate the response of four barley cultivars (Reyhan03, Yousef, Afzal, and Khatam) to salinity stress at 0 (control), 100, 200 and 300 mM levels as a factorial experiment, within the randomized complete block design in three replications in a greenhouse, using the Hoagland solution. The physiological and biochemical properties including dry weight and RWC, photosynthesis pigments, K+/Na+, osmotic adjustments (soluble sugars, glycine betaine, proline), hydrogen peroxide and antioxidants enzymes (catalase and peroxidase) in root and shoot of barley cultivars were evaluated in saline and non-saline conditions. To determine the relationship between growth performance and the physiological and biochemical properties, the correlation between the properties and causality analysis was examined. Results obtained from comparing the mean among the treatment combinations showed that the salinity stress reduced the dry weight, photosynthesis pigments, and K+/Na+, while it increased the soluble sugars, glycine betaine, proline, H2O2, catalase and peroxidase in the root and shoot of barley cultivars. Correlation analysis indicated that potassium in the shoot had the most positive and significant correlation coefficient (r= 0.86) with the dry matter of shoot. The stepwise regression analysis showed that the root dry weight, catalase of root and shoot, H2O2 of shoot and K+/Na+ of shoot contributed to the performance. Causality analysis revealed that the root dry weight, K+/Na+ of shoot, and catalase of shoot were highly important as they had a direct positive and significant impacts on the performance of shoot dry matter.

Keywords

Subjects

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Journal of Agricultural Science and Technology
Volume 22, Issue 4
May and June 2020
Pages 1009-1021