Salt Stress Tolerance of Spring Canola (Brassica napus L.) Cultivars - Abstract
In order to evaluate the effect of salinity stress (three treatments including control, 6% and 20% sodium chloride) on yield and components of seed yield of spring canola (Sarigol, Delgan, Zaffar, Zarfam, RGS003), a factorial experiment based on Randomized Complete Block Design with three replications was conducted. Main effects of cultivar, salinity stress and interaction of salinity stress × cultivar in all evaluated traits were significant at 0.01 P-values. In all cultivars, the highest values of yield and its components were observed under non stress condition. Grain yield significantly decreased with increasing salinity levels. Dahlan cultivar (19.3 gr grain yield) had the highest seed yield under control conditions. Stepwise multiple linear regression analysis showed that grain weight per pod and number of pods per plant had the highest effect on grain yield and explained 95% of grain yield variations. Factor analysis showed that four factors explained 80.81% of total variations. The first factor explained 36.07% of total variance and was named as an effective factor in vegetation growth. The second factor explained 16.28% of the variation and was identified as the grain yield and its components factor. The third and fourth factors explained 14.8% and 9.66% of total changes respectively, and were named as root dry weight and one thousand seed weight factors respectively. In this research, Sarigolcultivar was introduced as tolerant cultivar due to the highest grain yield under salinity stress conditions.