Estimation of heterosis and combining ability in soybean among top crosses analysis [electronic resource].

Includes references.

Ten attributes were measured in F₁ soybean crosses and their parents a two testers top crossed eight lines. Two testers (males) genotypes used namely L86-K-73 and 089-8940 and eight lines (females) used namely L-113Z, Giza111, Giza22, P1416937, Linford, L- 160Z, L-105Z and L-117Z. F₁ hybrids gave average heterosis values over their midparent and better parent of (18.98%. 8.89%) for plant height, (59.46%, 50.02%) for number of branches /plant,(80.01%,8.85%) for number of seedslplant.(72.46%,71.18%) for number of podslplant ,(10.94%,4.41%) for number of seeds/pod ,(13.58%,4.67%) for 100seed weight and (95.26,84.65) for seed yield/plant. Some hybrids were earlier in flowering and maturity than their later parents. The mean squares due to parents, crosses and males by females were found to be highly significant for all the studied traits. Relative estimates of the variance due to general combining ability (δ²gca) and specific combining ability (δ²sca) indicated that (δ²sca) played a major role in the inheritance of all traits. The first (L86-K-73) gave the negative disamle value and higher significant gi effects than the second tester (089-9840) for earliness trans. The second tester gave the highest positive significant Oi effects than the other tester for yield components character. The female line (L.105Z) behaved as good combiner for all trails expect 100-seed weight foliowed by line (L-160Z). Significant "sea" effects were detected for plant height, number of seeds/plant, number of podslplant and seed yieldlplant in top cross (089-8940 X Linford).

Summary in Arabic.

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