ارزیابی مقادیر سدیم، پتاسیم و نسبت آنها در پانزده رقم کلزا در سطوح مختلف شوری

Low concentration of cytosolic sodium and increased ratio of potassium to sodium ions is considered as a significant factor for salt tolerance. To examine Na, K and their ratio as the criteria for salt tolerance, fifteen rapeseed cultivars (Adriana, Zarfam, Okapi, Karaj I, Talaye, Cooper, Modena, NK-Aviator, NK-Octans, NK-Karibik, NK-Alamir, Champlain, Karun ALM046 and Opera) were examined in a factorial experiment by a totally random design including three repetitions for three different salinity levels (1.2, 6.2 and 9.3 dS/m). The saline treatment was applied to the seedlings at four-leaf phase. The results revealed that as a result of salt stress, the shoot and root experienced increased accumulation of sodium ions and the degree of such an increase depended on the cultivar. The cultivar of SLM046 showed the highest ratio of Potassium to Sodium in the shoot and root while the cultivar Cooper had the lowest ratio. Principle Component Analysis (PCA) and Biplot graph were used to classify the cultivars and to differentiate tolerant and intolerant cultivars based on the number of ions. Cultivar SLM046 was identified as the most salt tolerant and cultivar cooper as the most salt intolerant cultivar.