GENETIC ESTIMATION OF YIELD AND YIELD COMPONENTS IN COTTON THROUGH TRIPLE TEST CROSS ANALYSIS | ||
| Journal of Plant Production | ||
| Article 9, Volume 4, Issue 2, February 2013, Pages 229-237 PDF (690.93 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2013.68985 | ||
| Author | ||
| Eman M. R. M. Saleh* | ||
| Cotton Research Institute, Agricultural Research Center, Giza, Egypt. | ||
| Abstract | ||
| The success of plant breeding operations relies heavily on the nature and extent of genetic components of variation. Thus it is imperative to have reliable estimates of such components in order to formulate an efficient breeding strategy. In the present study, ten diverse lines in F2 generation were crossed to three testers viz., Giza 86(L1) ,Austuralian(L2) and their F1 Giza86 X Austuralian (L3). The parents (lines and testers) and crosses were evaluated in randomized complete block design. Analysis of variance revealed significant differences among progenies. The deviations (cultivars L1 + cultivars L2 – cultivars 2 L3) were analyzed to provide a test of epistasis. Additive- dominance model was fitted to the data for these traits not influenced by gene interaction. The results indicated that total epistasis was insignificant for all traits. The partitioning of the total epistasis, showed significance of ( i ) types fixable part of epistasis for all traits except lint percentage, fiber strength and micronaire, while the unfixable epistasis, dominance x dominance and dominance x additive was significant for all traits except lint percentage, fiber strength and micronaire. Additive gene action played the important role for all studied traits except for lint cotton yield, upper half mean, fiber strength and micronaire. While, dominance effects were insignificant for all traits. The degree of dominance revealed that the ratio was less than unit indicated the predominant role of additively in controlling boll weight ,seed and lint cotton yield ,seed index and uniformity ratio, whilst this ratio was equal to unity for lint percentage and upper half mean showed the important of both additive and dominance properties of genes, The higher degree of dominance for fiber strength and micronaire showed over- dominance. The results showed that the dominant alleles were dispersed between testers, as hybrids did not show any proof of directional dominance for all characters. | ||
| Keywords | ||
| Cotton; triple test cross; Epistasis | ||
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