Estimation of gene effects for seed yield and its component characters in Indian-mustard (Brassica juncea (l.) Czern and Coss)
| dc.contributor.advisor | Pant, D.P. | |
| dc.contributor.author | Ojha, Om Prakash | |
| dc.date.accessioned | 2016-08-31T14:01:18Z | |
| dc.date.available | 2016-08-31T14:01:18Z | |
| dc.date.issued | 2008-08 | |
| dc.description | Thesis-PhD | en_US |
| dc.description.abstract | Rapeseed-mustard, Indian-mustard (Brassica juncea (L.) Czern and Coss) is the most important crop grown during rabi season in north western and central part of India. The genetic base of the rapeseed-mustard has decreased drastically resulting in limited levels of genetic diversity which is highly needed to create new accessions. Therefore, present investigation was undertaken to estimate and detect non-allelic interactions using joint scaling test diallel analysis (excluding reciprocals) and triple test cross analysis. The experimental material consisted of 54 genotypes (8parents + 28F’1+4BC1’s+4BC2’s+6F1 with hybrid tester) derived from 8 parents. These progenies were evaluated in a randomized complete block design in three replications. Observations were recorded for 14 important quantitative traits, namely, days to flower initiation, days to 50% flowering, days to maturity, plant height, length of main shoot, number of primary branches per plant, number of secondary branches per plant, number of siliquae on main shoot, length of siliqua, number of seeds per siliqua, seed yield per plant, 1000-seed weight, oil content and harvest index. The data were subjected to statistical analysis for joint scaling test following Cavalli (1952), diallel analysis following Griffings (1956b, MethodII, Model I) and triple test cross analysis following Ketata et al., (1976). Six generations (P1, P2, F1, F2, BC1 andBC2) of four crosses namely, JD-6×Vardan (C I), Pusa Karisma×Kranti (C II), Basanti×Pusa bold (C III) and PRQ-2005×Kanti (C IV) were evaluated to study the gene action involve in the inheritance of seed yield and its component characters. The data of six generations were subjected to joint scaling test (Cavalli, 1952) to test the adequacy of additive-dominance and digenic interaction (5 parameter) model. Among gene effects, additive gene effect (d) were found to be more important under adequate model for days to flower initiation and seed yield per plant. Dominance gene effect (h) has important role in governing the inheritance of days to 50% flowering, plant height, number of secondary branches per plant, length of main shoot and 1000-seed weight. Both additive and dominance gene effects were involved in the expression of plant height, length of main shoot, number of secondary branches per plant and seed yield per plant. Considering the interactions ‘i' and ‘l’ were equally important for various quantitative traits. Diallel analysis experiment was consisted of 36 treatment (28 F1’s+8 parents) excluding reciprocals. Parents involved in the experiments are JD-6, Kanti, Basanti, Kranti, Varuna, Pusa Karisma, PRQ-2005 and Pusa bold. The combining ability analysis was carried out following model 1 and method 2 of (Griffings, 1956). General combining ability variances and specific combining ability variances were significant for all the traits. The parents showing best per se performance alongwith high gca were Kanti for days to flower initiation, days to 50% flowring, days to maturity and Kranti for number of secondary branches per plant and length of main shoot. Five top crosses which were selected on the basis of sca effect were Vardan×Pusa Karisma, Kranti×Vardan, Basanti×Kranti, JD-6×Pusa bold and PRQ-2005×Pusa bold. Triple test cross analysis (Ketata et al., 1976) was carried out to study the non-allelic interaction additive and dominance gene effect, degree and direction of dominance for the important economic characters including yield and oil content. The experimental material 6 lines, 3 tester (L1, L2 and L3 i.e. L1×L2) and 18 crosses (line×tester) were grown in randomized block design with 3 replications. Total epistasis was found significant for all the characters except oil content. Magnitude of total epistasis was higher for days to maturity, plant height, length of main shoot, days to 50% maturity, days to flower initiation and siliquae on main shoot. Partitioning of epistasis into ‘i' and ‘j+l’ type epistasis, indicate that presence on non-allelic interaction for different quantitative traits. Both ‘i' and ‘j+l’ type of interaction were found significant for all the characters. Results indicated that most of the characters were under the control of additive gene effects. Dominance gene effect were found significant for days to flower initiation, days to maturity, plant height, primary branches per plant, siliqua on main shoot, seed yield per plant, 1000-seed weight and oil content. Presence of partial dominance was observed for all the characters except 1000-seed weight. Significant and positive correlation coefficient were recorded for days to 50% flowering and siliqua on main shoot. Overall results indicated that both fixable and non-fixable effects are available for most of the characters which may be exploited effectively through the appropriate breeding programmes. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/74721 | |
| dc.language.iso | en | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.sub | Genetics and Plant Breeding | |
| dc.subject | gene expression, seed production, yield components, characterization, mustard, Brassica juncea, quantitative traits, inheritance, progenies, path analysis, diallel | en_US |
| dc.these.type | Ph.D | |
| dc.title | Estimation of gene effects for seed yield and its component characters in Indian-mustard (Brassica juncea (l.) Czern and Coss) | en_US |
| dc.type | Thesis | en_US |