Browsing by Author "Patel, Kamlesh N."
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ThesisItem Open Access GENETIC STUDIES IN PIGEONPEA ( Cajanus cajan [L.] Millsp.)(AAU, Anand, 1994) Patel, Kamlesh N.; Patel, D. R.The study was conducted at plant breeding farm, B.A. College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand during Kharif 1993-94 involving four crosses viz., cross I (Anand A-1 x Pusa 851), cross II (GAUT 82-92 X AF 100), cross III (Anand A-1 x H 76-208) and cross IV (GAUT 82-90 x ICP 84023), each having six generations P1, P2, F1, F2, B1 and B2) in a compact family block design replicated thrice for the estimation of genetic parameters (Gene action. Heterosis, Inbreeding depression, Heritability and Genetic advance) for thirteen characters in pigeonpea (Cajanus cajan [L.] Millsp.). The analysis of variance revealed significant variation among different generations in all four crosses for various characters except days to flower, number of clusters per plant, number of pods per plant and total soluble sugar content in cross III; number of primary branches per plant in crosses II and III; pod to seed ratio, pod thickness and protein content in crosses III and IV and methionine content in crosses I, III and IV indicating considerable variability in the material tested for the characters under study. The estimation of gene effects revealed that in cross I, both additive as well as non-additive, gene effects were involved in the expression of seed yield, protein content and total soluble sugar content. Only additive effect was observed for plant height, number of seeds per pod and 100 seed weight, whereas only non-additive gene effects were found responsible for days to flower, number of clusters and pods per plant and pod thickness. In cross II, both additive as well as non-additive gene effects were observed for protein content, only additive effect for days to flower, plant height, number of pods per plant and 100 seed weight and only non-additive effects for number of seeds per pod, pod to seed ratio, pod thickness, seed yield, methionine content and total soluble sugar content. Cross III showed only non-additive effects for 100 seed weight. Both additive as well as non-additive gene effects were observed for days to flower, number of clusters and pods per plant, number of seeds per pod and 100 seed weight, whereas only additive effect was involved in the expression of plant height, number of primary branches per plant and seed yield per plant in cross IV. Significant desirable heterosis and heterobeltiosis were observed for plant height, number of primary branches per plant, number of clusters and pods per plant, pod thickness, seed yield and methionine content in cross I; plant height, number of clusters and pods per plant, number of seeds per pod, pod to seed ratio, pod thickness, seed yield and total soluble sugar content in cross II; plant height, number of clusters and pods per plant, pod to seed ratio, seed yield and methionine content in cross III and for protein content and total soluble sugar content in cross IV which suggested the feasibility for the exploitation of hybrid vigour on commercial scale. Cross II (GAUT 82-92 x AF 100) can best be exploited commercially as it was found most heterotic. The results revealed that generally the crosses showing higher magnitude of heterosis and heterobeltios is also exhibited higher magnitude of inbreeding depression. High heritability coupled with high genetic advance as per cent of mean observed for seed yield and many of the yield components in various crosses revealed that seed yield and its important components viz., number of clusters and pods per plant, plant height and number of primary branches per plant can be improved upon by following selection in succeeding segregating generations. Low narrow sense heritability coupled with low genetic advance for number of seeds per pod and 100 seed weight, however, suggested slow improvement in these important traits using selection.