Journal of Biological Sciences

Year: 2008 | Volume: 8 | Issue: 1 | Page No.: 143-148
DOI: 10.3923/jbs.2008.143.148

Accumulation and Role of Ions (Ca²⁺, Mg²⁺, SO₄^2-) on Salt Tolerance in Triticum turgidum L.

M.R. Hadi, S.M. Khiyam-Nekoie, R. Khavarinejad, N.A. Khosh Kholgh Sima and P. Yavari

Abstract: Understanding the mechanisms of salt tolerance and the physiological and biochemical factors are very important in plant crops. Salinity-minerals (Ca²⁺, Mg²⁺, SO₄^2-) interactions, which have been shown to be important in plants grown in saline conditions, were studied in durum wheat (Triticum turgidum L.). Two genotypes of durum wheat, one salt-tolerance (ICDW751) and the other salt-sensitive (ICDW324) were grown in nutrient solution containing 0, 50, 100 and 150 mM. NaCl. Amount of minerals of Ca²⁺, Mg²⁺ and SO₄^2-were determined in the shoot and roots. Usually, salinity reduced Ca²⁺ and Mg ²⁺ contents in shoot and root of both genotypes, mainly in the salt-sensitive genotype. Apparently, SO₄^2- content in shoot increased as the medium salinity increased, especially in the salt- tolerance genotype. Salinity increased significantly Na⁺/Ca²⁺ ratio and sodium adsorption ratio (SAR) = Na⁺/(Ca²⁺+Mg²⁺)^½ of shoot and root in both genotypes, mainly in the salt-sensitive genotype. Thereby, we suggested that ratio of Na⁺/Ca²⁺ and especially amount of SAR in durum wheat (Triticum turgidum L.) are suitable for discrimination salt-tolerance genotype from salt-sensitive genotype.

Keywords: Mg²⁺and SO4^2-, accumulations of Ca ²⁺, salinity, Triticum turgidum and tolerance genotype

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