Abstract
Diallel analysis in Rapeseed (Brassica napus L.) was carried out during 2011-2012 at The University of Agriculture, Peshawar to estimate the pattern of inheritance and heritability for important traits. During 2010-2011 four contrasting genotypes of Brassica napus. viz. G2, G4, G6 and G9 were crossed in a diallel manner and in the following season (2011-2012) all the F1 hybrids along with parents were evaluated under field condition in a randomized complete block design. Highly significant (P ≤ 0.01) differences were observed for plant height, primary branches plant -1 , seeds pod -1 , pods plant -1 , weight of 1000 seed, seed weight plant -1 . Additive-dominance model was fully adequate for plant height, primary branches plant -1 , pods plant -1 , seeds pod -1 , whereas for the rest of the traits it was partially adequate. Diallel analysis showed significant additive (a) and dominance (b) variances for all parameters. Genetic parameters estimation showed significant and higher magnitude of dominance component for all the studied traits. Graphical analysis showed overdominance for all of the parameters. The value of average degree of dominance for plant height (1.858), primary branches plant -1 (4.355), pods plant -1 (3.704), seeds pod -1 (2.417), 1000 seed weight (3.995) and seed weight plant -1 (1.852) also indicated the presence of overdominance gene action controlling these yield attributes, as it was greater than one. Low narrow (0.16-0.31) and broad (0.81-0.96) sense heritabilities were estimated for all the studied parameters, suggesting the low value of additive gene action and genetic potential for the improvement of such traits through selection in later generations.
Highlights
In Pakistan, shortage of edible oil is a great problem for many years due to the absence of high yielding varieties
Pakistan has made tremendous progress in many field crops such as wheat, cotton, etc, but not such satisfactory progress has been achieved in oil crops, as our country is facing a leviathan problem of edible oil shortage
During year-II (2011-2012), a randomized complete block design was used for the evaluation of all the 12 first filial generations (G9 × G2, G2 × G9, G6 × G2, G2 × G6, G4 × G2, G2 × G4, G9 × G6, G6 × G9, G9 × G4, G4 × G9, G6 × G4, G4 × G6) along with four parents (G2, G4, G6, G9) in three replications
Summary
In Pakistan, shortage of edible oil is a great problem for many years due to the absence of high yielding varieties. The values of ‘a’ and ‘b’ were found highly significant for primary branches plant-1 (Table-2) showing importance of additive and dominant gene action for primary branches plant-1. Low narrow sense heritability (0.19) and high (0.91) broad sense heritability (Table-4) was observed for primary branches plant-1 showed higher contribution of dominance genetic variation to this trait as compared to additive genetic variation.
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