Evaluation of Three Cycles of Recurrent Selection for Improvement of Seed Yield in Safflower Using Genetic Male Sterility

摘要

The present study was undertaken to determine extent of yield improvement expected after second cycle of recurrent selection from random mating population of safflower, to estimate genotypic and phenotypic correlations and to select the promising progenies significantly superior over checks AKS-207, Bhima. and PKV Pink. Total 150 half-sib families having sufficient seeds were selected from random mating population in safflower for second cycle evaluation. These half-sib families along with three checks (AKS-207, Bhima and PKV Pink) were grown in augmented block design in rabi 2013-14. The genetic variance among half-sib families ( ? 2 H.S ) and additive variance ( ? 2 A ) was high and significant for plant height (260.38 and 1041.52) followed by number of capitula per plant (106.04 and 424.16). Heritability estimates in narrow sense was highest for seeds per capitulam (90.89%) followed by seed yield per plant (88.58%), number of capitula per plant (87.91%), plant height (77.22),100 seed weight (g) (64.30%), number of primary branches per plant (57.38), oil content (55.55%), days to maturity (29.80),days to 50% flowering (27.93). The expected genetic advance was highest for the number of capitulum per plant over population mean (86.13%), over check variety AKS-207 (83.11%), over Bhima(87.87%) and over PKV Pink (80.00%) at 5% selection intensity. The seed yield per plant was significant and positively correlated with plant height (0.59*), no. of primary branches per plant (0.71*), no. of capitulum per plant (0.73*) and 100 seed weight (g) (0.27*).The top 20 half-sib families observed to be significantly superior over AKS-207, Bhima and PKV Pink were selected for recombination cycle in further safflower population improvement programme during rabi 2015-16.