The responses of three wheat (Triticum aestivrm,L) cultivars to salt stress regarding ion distribution pattern within the plant were evaluated in a pot experiment using randomized block design with factorial treatments. Salinity levels were 0.0,2.5 and 5g/l NaCl in water in Inia-66 , Tabasi and sholeh the wheat cultivars employed.
Based on the results obtained Na+ content of the plants was increased under salt stress cinditions , specially during grain filling period, while that of the K+ reduced. The selective system of K+ over Na+ from roots to stems showed almost no resestance to salt stress , but those from stems to the leaves and from stems to the grains showed significantly higher efficiencies , resultingin higher K+/Na+ ratios in the leaves and grains under salt stress conditions . In monresistant Inia-66 cultivar higher K+/Na+ selectivity was observed from roots to stems, but at the starting point of the leaves and grains the two salt resistant cultivars showed higher efficiencies for k+/Na+ selective system. It was concluded that the selective system in ion transport between different plant parts may be considered as a salt resistance index , being more effective between stems and the grains,
)