Identification of moderate and drastic salinity stress-tolerant genotypes in canola cultivars using stress tolerance indicators

Canola (Brassica napus L) is one of the most important oilseeds in the world. Then again, saline soils and the salinity of irrigation water are of the most important factors of ambient stress in canola production. Thus, to evaluate and identify moderate and drastic salinity tolerant genotypes in canola cultivars using experimental stress tolerance indicators on 7 canola cultivars named (Talaieh, Hayola 50, Hayola 420, Reg & cob, Opera, H6729, and T98007) in different salinities of irrigation water including (normal water (control), 5 and 10 Desi Siemens per meter) as a split-plot experiment in the format of a randomized complete blocks design with four iterations in the crop year of 2020-21 in Astara city was performed. Salinity was considered as the main factor and cultivars as the sub-factor. In this research, the highest grain yield under normal conditions was related to Hayola 420 and H6729 cultivars with an average of 2.68 and 2.44 tons per hectare, and the lowest grain yield was related to Hayola 50 with an average of 1.88 tons per hectare. The highest grain yield under moderate and drastic salinity stress was the mean (2.33 and 2.3 ton per hectare for Hayola 420) and (2.01 ton per hectare for Hayola 420, respectively), respectively and the lowest yield of the grain was related to Reg & cob under moderate salinity stress conditions with an average of 1.6 tons per hectare and T98007 under drastic salinity conditions with an average of 1.5 tons per hectare. In this study, among the cultivars evaluated, Hayola 420 and H6729 cultivars had the highest values of stress tolerance in both conditions. While cultivar T98007 showed the lowest amount of stress tolerance. In both moderate and drastic salinity stress conditions (salinity 5 and 10 Desi Siemens), very high values of correlation between STI and GMP indicators with MP indicator cause the MP indicator to be hidden in these two indicators, and that???s why the figures selected based on Both STI and GMP indicators mostly use high values of MP indicator.