BIOMETRICAL ANALYSIS OF SOME IMPORTANT QUANTITATIVE CHARACTERS IN SNAPDRAGON (Antirrhinum majus, L.). | ||||
| Journal of Plant Production | ||||
| Article 16, Volume 25, Issue 10, October 2000, Page 6353-6366 PDF (604.04 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2000.259789 | ||||
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| Authors | ||||
| M. Badr,1; M. G. El–Torky1; Rabha Abbas2; Gehan Gaber2 | ||||
| 1Dept. of Floriculture, Fac. of Agriculture, Alexandria Univ., Egypt. | ||||
| 2Antoniadis Botanical Garden, Horticulture Research Institute, Agriculture Research Center, Alexandria, Egypt. | ||||
| Abstract | ||||
| Intraspecific hybridization among four cultivars of snapdragon, i.e. P1 = Sonnet wit (white), P2 = Sonnet karmijn (red), P3 = Sonnet rose (rose) and P4 = Sonnet geel (yellow) was carried out during three successive growing seasons: 95/1996, 96/1997 and 97/1998 at Antoniadis Botanical Garden, Horticulture Research Institute, Agriculture Research Center, Alexandria, Egypt. The main objective of this investigation was to produce new patterns of snapdragon, especially with reference to flower characteristics. Diallel cross analysis was used to study and determine the genetic system controlling vegetative growth and also the type of gene action for the different traits. Additive and dominance gene effects were significant in the F1 and F2 – generations with respect to plant height. The overdominance gene effects played an important role in the inheritance of plant height. Heritability in narrow sense was intermediate in both generations and no inbreeding depression was obtained for most crosses. Most of dominant genes have positive effects and increased plant height. All F1 – crosses achieved positive heterosis. Additive gene effect played the major role by the inheritance of the number of branches per plant. Heritability in narrow sense was intermediate in the F1 and F2 generations. Most of dominant genes have negative effects and decreased the number of branches. The overdominance gene effects played an important role for F1 hybrids and partial dominance in the F2 generations. The dominant genes were more frequent than recessive in the parents. Most crosses achieved positive heterosis. Additive and dominance genes effects were involved in the inheritance of the number of leaves per plant. Heritability in narrow sense was moderate indicating that this trait could be advanced by selection. The degree of dominance (H1/D)½ was found to be overdominance in the F1 hybrids confirmed with Wr, Vr graph. In the F2 generations the results of Wr, Vr graph contradicted with the ratio (H1/D)½ indicated the presence of epistasis. Dominance genes seemed to be acted in negative direction in the F1 hybrids and P1 carried most recessive genes, while in the F2 dominance genes acting in positive direction and P2 and P3 have most dominant genes. In the F1 hybrids, additive and dominance components were found to be not significant with respect to leaf area. Environmental effects were high and such large environmental role and also overdominance was involved in the inheritance of leaf area. The parent seemed to carry more dominant genes than recessive. Dominant genes seemed to be acting in positive direction and increased leaf area. | ||||
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