Stability analysis by TAI method for some genotypes in Flax (Linum usitatissimum L.)

This research was conducted to estimating the stability of eight new genotypes of flax, which are Sakha 1, Sakha 2, Sakha 3, Sakha 5, Sakha 6, Giza 8, Syrian and Poloni . The genotypes were planted in the research station of the Field Crops Department, College of Agriculture - University of Tikrit during the season (2019/2020), It included six agriculture environments, which are the combination of two planting distances (5 and 10 cm) and three planting dates, and it was applied according to the split-plot system in the Randomized Complete Block Design (RCBD) with three replicates. Plants were distributed in separate plots by four lines for each genotype in each environment, were the length of the line was (2 m) and the distance between the lines was (0.40 m). The main plots contained agricultural environments and the sub plot contained the genotypes. The study included thirteen traits, the duration to 50% flowering and plant height, the number of vegetative branches, and the number of capsules per plant , Number of seeds per capsule, seed yield per plant, The 1000 seed weight, average leaf weight, biological yield, leaf percentage, seed yield, and harvest index. The results showed that the genotypes that occurred in the α area , which were of moderate stability, were (Sakha 2) in the traits of plant height, (Syrian and Sakha 3) in the number of vegetative branches, (Sakha 2 and Sakha 5) in the number of seeds per capsule and (Sakha 1 ,Giza 8) in average the leaves weight and (Sakha 3 and Sakha 1) in the percentage of leaves and (Sakha 5 and Poloni) in the harvest index, The genotypes that are adapted to environments with high productivity were shown as (Sakha 5 and Poloni) in duration to 50% flowering, (Syrian) in plant height, (Giza 8) in the period to maturity, (Sakha 3, Giza 8) in the number of capsules and (Syrian and Sakha 3 and Sakha 1) in The number of seeds per capsule, (Syrian and Sakha 3) in the seed yield of the plant, (Sakha 6) in the weight of 1000 seeds, (Poloni) in the average leaf weight, (Sakha 3) in the biological yield, (Giza 8) in the leaf percentage, and (Syrian and Sakha 6) in the seed yield and (Syrian) in the Harvest index.