Estimation of combining ability, heterosis and heritability in some egyptian cotton crosses [electronic resource]

Includes bibliographic reference

The present investigation was carried out to study heterosis, general and specific combining ability and heritability in broad and narrow sense for yield and yield component traits using line × tester analysis design for eight parents (five lines and three testers) of cotton and their 15 F1 hybrids. Mean squares due to genotypes (parents and their F1 hybrids) were highly significant for all studied traits revealing a large amount of variability among them. Results indicated that the cross (No. 1) had displayed the best heterosis (desirable) relative to mid-parent and better parent for (L. %) with values 7.76 and 7.25%. While, the cross (No. 4) had showed the best heterosis (desirable) relative to mid-parent and better parent for (S.I.) and (L.I.) with values 10.31, 9.15, 18.04 and 15.77%, respectively. In addition, the estimates of (G.C.A.) effects for (No.O.B. / P.), (B.W.), (S.C.Y. / P.) and (L.Y. / P.) were positive and highly significant in line (L5) in F1 hybrids. In addition, the cross (No. 12) in F1 hybrids had showed positive and highly significant for (No.O.B. / P.), (B.W.) and (S.C.Y. / P.). Results clarified that the estimates of broad sense heritability in F1 hybrids for (No.O.B. / P.), (B.W.), (S.C.Y. / P.), (L.Y. / P.), (L. %), (S.I.) and (L.I.) were moderate to high with values 96.25, 96.04, 97.35, 93.09, 54.70, 97.42 and 41.49%, respectively.

Summary in Arabic