Triple test cross analysis for some morphological traits in mungbean (Vigna radiata (L.) Wilczek) |
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Authors: | GSS Khattak MA Haq M Ashraf GR Tahir |
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Institution: | (1) Nuclear Institute for Food and Agriculture, Tarnab, Peshawar, NWFP, Pakistan;(2) Nuclear Institute for Agriculture and Biology, P. O. Box 128, Faisalabad, Pakistan;(3) Department of Botany, University of Agriculture, Faisalabad, Pakistan |
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Abstract: | Thirty progenies of mungbean were produced by crossing 10 true-breeding genotypes with three testers (NM 92, 6601, and their
F1) in a Triple Test cross (TTC) fashion and evaluated with parents in the kharif (July-October) and spring/summer (March-June)
seasons. The data on parents and F1s were analysed for pod clusters on main stem, pod clusters on branches, node of the first peduncle, nodes on main stem and
average internode length to detect epistasis and estimate additive and dominance components of genetic variation. Epistasis
was observed for node of the first peduncle and nodes on main stem in the kharif season. Partitioning of total epistasis revealed
that both additive × additive (i type), and additive × dominance, and dominance × dominance (j and l types) interactions were
significant with prevalent influence of i type interactions on these traits. Both additive and dominance components of genetic
variation were significant for all those traits not significantly influenced by epistasis in either or both seasons. The additive
component was predominant for pod clusters on main stem, pod clusters on branches and average internode length in the kharif
season, and for the node of the first peduncle and nodes on main stem in spring/summer season whereas dominance component
was important for pod clusters on main stem, pod clusters on branches, and average internode length in spring/summer season.
These results suggested that particular generation of segregating population and specific breeding method for selection might
be adopted in each season for the improvement of these traits in mungbean.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | additive component dominance component epistasis triple test cross |
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