در گندم NACL واكنش مقادير سديم ، پتاسيم و كربوهيدرات هاي محلول به سطح شوري ناشي از

Na+, K+ and Soluble Carbohydrate Responses of Wheat Plants to NaCl Salinity

In a greenhouse experiment, the effects of 0, 2.5 and 5g/l NaCl salinity of irrigation water on Na, K, sucrose and fructose concentrations in the main stem leaves of three wheat cultivars were investigated during two weeks after anthesis. Inia, Sholeh and Tabasi were the three cultivars used in a randomized complete block design as factorial treatments with three replications. The results showed that the concentration of sucrose in Tabasi increased and in Inia and Sholeh decreased under saline conditions, while no effect was observed regarding fructose concentration. The results of experiment showed that the Inia cultivar could not adjust its osmotic potential, whereas Sholeh and Tabasi made osmotic adjustment effectively under salinity. These two cultivars showed higher salinity resistance. A significant negative correlation was observed between leaf sodium and sucrose concentrations of the salt sensitive Inia cultivar; the correlation between potassium and sucrose was positively significant. There was no significant correlation between sucrose and these ions in Sholeh and Tabasi. Based on the results obtained, leaf sodium and potassium content alone may not give effective criteria for evaluation of salt tolerance in wheat. Leaf K concentrations along with the sucrose and fructose concentration seems to be more better or suitable criteria of salt tolerance in these wheat cultivars.