gene effects for agronomic traits in safflower (carthamus tinctorius l.) under drought stress

the mode of agronomic traits inheritance was investigated in safflower (carthamus tinctorius l.) in drought stress as a new report. five generation including p1, p2, f1, f2 and f3 that derived from the cross of il.111 (drought sensitive) ×mex.22-191 (drought tolerance) were used in a randomized complete block design with two replications. generation mean analysis was used to estimate genetic parameters. the additive model [d] was fitted for seed-weight, dry weight/plant and number of seeds/plant. the simple additive-dominance model [d, h] was fitted for number of seeds/ capsule. additive-dominance model was not adequate for plant height, number of branches per plant and number of capsules per plant. hence, dominance× dominance epistasis [l] was added to fit the model as [d, h, l] for these traits. so, the genetic control of mentioned traits was under additive, dominance and dominance× dominance gene effects. obtained results could be suitable for designing of breeding strategies to improve seed yield of safflower in drought stress. the highest value for broad-sense (0.94) and narrow-sense (0.9) heritability were denoted to seeds/capsule.