Salinity Stress Indices of Seed Yield and Nutrient Compositions in Rapeseed (Brassica napus L.)

Soil salinity is a serious constrain to crop production in many areas of the world. Seven rapeseed genotypes were evaluated at two salinity levels of irrigation water including 0 and 12 ds/m in green house condition based on completely randomized design with three replications. The results showed that the most of the genotypes with the high seed yield in the non saline condition had high amount of seed yield in saline condition. Amount of sodium (Na) and calcium (Ca) were more correlated than potassium (K) with seed yield. Stress tolerance index related to potassium (STI) was significant positive correlated to Yp and Ys which indicating the importance of this stress index for improving seed yield in saline condition.L18 with high efficiency of Ca absorption in saline condition had the highest amount of seed yield in stress condition. STI was more efficient selection than SSI for improving seed yield and the other ions composition. On the basis of factor analysis the shoot ions compositions including Ca and Na are more suitable than K for discriminate the saline tolerant genotypes.