NATURE OF GENE ACTION FOR SOME ECONOMIC TRAITS AND COMBINING ABILITY IN SEVERAL GENEOTYPES OF OKRA | ||||
| Journal of Agricultural Chemistry and Biotechnology | ||||
| Article 1, Volume 6, Issue 3, March 2015, Page 53-63 PDF (701.63 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jacb.2015.44042 | ||||
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| Authors | ||||
| M. Hamada1; M. Abd El-Aziz2; Manal Zaater1 | ||||
| 1Genetics Department, Faculty of Agriculture, Damietta University, Egypt. | ||||
| 2Genetics Department, Faculty of Agriculture, Mansoura University, Egypt. | ||||
| Abstract | ||||
| This investigation was done to study combining ability and nature of gene action for some economic traits of okra (Abelmoschus esculentus L. MOENCH),using four different parental genotypes that were crossed in a complete diallel design. Mean squares of genotypes were significant for all studied traits, providing evidence for presence of considerable amount of genetic variation among studied genotypes . The general combining ability (GCA) and specific combining ability (SCA) mean squares were highly significant for all studied traits expect days to first flowering which was significant only for GCA. This indicated that both GCA and SCA were important in the inheritance of these traits. Significant reciprocal effect mean squares were found for Fruit Length, Fruit Diameter, Fruit weight and Total yield per plant, indicating that these traits were controlled by extra-nuclear factors as well as nuclear factors. Significant SCA effects in desirable direction were observed for most crosses in some studied traits. Good performance of the obtained crosses may be attributed to additive × dominance or dominance × dominance epistatic interactions. This suggested that the important role of non additive gene action in the inheritance of the studied traits. The estimations of general combining ability variance (σ2gi) and specific combining ability variance (σ2si) of the parental varieties for all studied traits indicated that the developed varieties used in this study are of great importance to improving most studied traits. Estimates of genetic parameters and heritability for all studied traits verified the predominance of non additive gene action in the inheritance of these traits. As well as, indicated that the studied traits except days to first flowering were not only controlled by nuclear genetic factors, but also the cytoplasmic genetic factors play an important role in the inheritance of these traits. Therefore, the genetic material of this study could be used for hybridization to produce promising crosses with improved economic traits in okra. | ||||
| Keywords | ||||
| okra; Abelmoschus esculentus; Combining ability; gene action; heritability; cytoplasmic factors; genetic material | ||||
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