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Journal of Applied Sciences
Year: 2008  |  Volume: 8  |  Issue: 12  |  Page No.: 2300 - 2305

Comparison Between Salt Tolerance of Various Cultivars of Wheat and Maize

M. Goudarzi and H. Pakniyat    

Abstract: The effects of salt stress (NaCl and Na2SO4 in 1:1 ratio) on the activity of peroxidase (POD), proline accumulation, protein, Na + and K + contents and K + /Na + ratio were studied on leaves of two maize and wheat genotypes. Wheat cvs., [Kavir (tolerant) and Ghods (sensitive)] and maize cvs. [704 (tolerant) and 666 (semi-tolerant)] were grown under control (ECe = 1.26 dS m 1) and two levels of salinity (ECe = 6.8 and 13.8 dS m 1, respectively) in a greenhouse. A Completely Randomized Design (CRD) with factorial treatments with three replications was used. Salinity stress decreased K + and K + /Na + ratio and increased Na + , proline, protein and POD activity in both genotypes of wheat and maize under both salinity levels. Furthermore the results showed a lower amount of proline, protein and POD activity in wheat than maize cvs. On the other hand, the higher amounts of K + and K + /Na + ratios which were found in wheat than maize resulted in better ion homeostasis in wheat that caused this species to have a higher tolerance than maize. In wheat cvs.; salinity stress resulted in an increase in proline and protein contents, POD activity, K + and K + /Na + ratio in Kavir cultivar than Ghods. However, Ghods cultivar showed a higher Na + content than Kavir. In maize, cultivar 704 showed a higher increase in proline and protein contents, POD activity, K + and K + /Na + ratio and a lower increase in Na + than 666 cultivar. Maize cvs. showed a higher level of proline, protein and POD activity than wheat cvs., but these components may have been a reaction to salt stress in maize and not a plant response associated with tolerance. The results of this study suggest that Na + and K + contents and K + /Na + ratio in maize as a C4 plant and in wheat as a C3 plant may be considered for selecting the tolerant cultivars.

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