Genetic components of pod shattering in soybean |
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Authors: | P Tukamuhabwa P Rubaihayo KE Dashiell |
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Institution: | (1) Faculty of Agriculture, Makerere University, P.O. Box 7062, Kampala, Uganda;(2) International Institute of tropical Agriculture, PMB 5320, Oyo road, Ibadan, Nigeria |
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Abstract: | Half diallel crosses among ten pure breeding lines of soybean were made in 1997 and 1998 to study the inheritance of pod shattering
in soybean. Evaluation for pod shattering among F2 segregating populations was carried out in an oven set at 80 °C for 12 hours. Diallel analysis was carried out to estimate genetic parameters and detect presence of non allelic interaction
of genes affecting pod shattering. Hayman's diallel analysis indicated significant variation of Wr + Vr and Wr – Vr over arrays,
suggesting epistatic gene action. Similarly results from a joint regression coefficient over replications were significantly
(p < 0.05) different from unity and zero, suggesting presence of non allelic interaction of genes. The intercept was positive,
suggesting partial dominance for the shattering trait. Both general combining ability (GCA) and specific combining ability
(SCA) effects were significant (p < 0.05).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | additive effects combining ability dominance epistasis narrow sense heritability |
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