Estimates of heterosis and combining ability in okra under different environments
El-Sherbeny, G., Khaled, A., Obiadalla-Ali, H., Ahmed, A. (2018). Estimates of heterosis and combining ability in okra under different environments. EKB Journal Management System, 3(1), 50-64. doi: 10.21608/jsasj.2018.229199
G.A.R El-Sherbeny; A. G. A Khaled; H.A. Obiadalla-Ali; A. Y.M. Ahmed. "Estimates of heterosis and combining ability in okra under different environments". EKB Journal Management System, 3, 1, 2018, 50-64. doi: 10.21608/jsasj.2018.229199
El-Sherbeny, G., Khaled, A., Obiadalla-Ali, H., Ahmed, A. (2018). 'Estimates of heterosis and combining ability in okra under different environments', EKB Journal Management System, 3(1), pp. 50-64. doi: 10.21608/jsasj.2018.229199
El-Sherbeny, G., Khaled, A., Obiadalla-Ali, H., Ahmed, A. Estimates of heterosis and combining ability in okra under different environments. EKB Journal Management System, 2018; 3(1): 50-64. doi: 10.21608/jsasj.2018.229199

Estimates of heterosis and combining ability in okra under different environments

Journal of Sohag Agriscience (JSAS)
Article 4, Volume 3, Issue 1 - Serial Number 4, May 2018, Page 50-64  XML PDF (760.51 K)
Document Type: Research and Review Papers
DOI: 10.21608/jsasj.2018.229199
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Authors
G.A.R El-Sherbeny* 1; A. G. A Khaled1; H.A. Obiadalla-Ali2; A. Y.M. Ahmed2
1Dept. of Genetics, Fac. of Agric., Sohag Univ., Egypt.
2Dept. of Horticulture, Fac. of Agric., Sohag Univ., Egypt.
Abstract
Ten okra genotypes (Abelmoschus esculentus L.) were crossed using half diallel mating design to produce 45 F1 hybrids. The combining ability and the nature of gene action were determined for economic traits under combined data of tow sowing dates. Genotypic mean squares of were highly significant for all studied traits. Moreover, mean squares due to genotype×environment interaction (G×E) were highly significant for these traits except pod weight, suggesting a differential response of the genotypes from environment to another. The results indicated that the majority of crosses were significantly earlier, taller and higher yielding than their mid parents. Furthermore, there are some crosses showed desirable heterotic values over their better parent for the majority of traits. The results indicated that the magnitudes of the non-additive genetic variance (σ2D) were higher than those of additive ones (σ2A) for the majority of studied traits indicating the importance role of non-additive gene action in the inheritance of these traits. However, the magnitudes of σ2D×E interaction were more than σ2A×E for all studied traits. The largest value of broad sense heritability (98.80%) was recorded for pod weight, while the lowest value (36.22%) was observed for pod length. The estimates of narrow sense heritability ranged from 18.21% to 45.69% for numbers of days to flowering and plant height, respectively. These findings confirmed the predominance of non-additive genetic variance over additive one in the inheritance of these traits. Therefore, the promising crosses which showed desirable specific combining ability (SCA) effects and gave also high estimates of useful heterosis could be utilized for okra hybrids.
Keywords
okra Heterosis; Combining ability
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