BIOMETRICAL ANALYSIS OF SOME IMPORTANT QUANTITATIVE CHARACTERS IN SNAPDRAGON (Antirrhinum majus, L.). Part II : Flowering Characteristics. | ||||
| Journal of Plant Production | ||||
| Article 17, Volume 25, Issue 10, October 2000, Page 6367-6382 PDF (694.4 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2000.259791 | ||||
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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 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 work 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 flower traits and also the type of gene action for the different traits. The results showed that the additive and dominance gene effects were important in the inheritance of days to: first flower bud, showing colour and opening of the first floret. In the F1, dominance gene effect was significant. The degree of dominance and Wr, Vr graph indicated overdominance in the F1, but partial dominant in the F2. Most of dominant genes acted toward earliness. The parents P1 and P2 have most dominant genes. All F1 – progenies achieved negative heterosis towards the earliness. As for the number of spikes, the additive gene effects were important in the inheritance of that trait and overdominance was involved in the F1 and F2 generations. Dominance genes seemed to be acting in negative direction in the F1, while in the F2, dominance seemed to be acting in positive direction. Heritability in narrow sense was moderate in the F1 hybrids but low in the F2 generations, which indicated that environment effect had minor effect on this trait. Most of the F1 – progenies obtained hybrid vigour. With respect to spike length, the additive and dominance gene effects were important in the inheritance of this trait and overdominance was involved. Dominance genes seemed to be acting in positive direction and increasing spike length. Narrow sense heritability was moderate in the F1 but low in the F2. Environmental component was significant in both generations. F1 – progenies achieved hybrid vigour. As for the number of florets per spike, the dominance gene effect played the major role in the inheritance of this trait and overdominance was involved. In addition, additive gene variance was significant in the F2 generations only indicating that it was possible to accumulate the favorable genes. Heritability in narrow sense was moderate to low in the F1 hybrids and F2 generations. Dominant genes seemed to be acting in positive direction and increased the number of florets. The two parents P3 and P4 seemed to carry most dominant genes. The F1 – crosses obtained positive heterosis. | ||||
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