TRIALLEL ANALYSIS OF SOME QUANTITATIVELY INHERITED TRAITS IN Gossypium barbadense L.: 1- YIELD AND YIELD COMPONENTS | ||||
| Journal of Plant Production | ||||
| Article 10, Volume 28, Issue 10, October 2003, Page 7307-7318 PDF (3.86 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.245252 | ||||
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| Authors | ||||
| M. M. Abd EI-Maksoud,1; A. A. Awad2; A. M. Abd EI-BarYy2 | ||||
| 1Dept. of Genetics, Faculty of Agric., Mansoura Univ., EGYPT | ||||
| 2Cotton Research Institute, Agric. Res. Center, Giza, EGYPT | ||||
| Abstract | ||||
| This investigation aimed to evaluate some three-way crosses of Egyptian cotton for combining ability and further partition of genotypic variance to its components for yield and yield components. The genetic materials used in the present study included six cotton varieties and their 60 three-way crosses. These genotypes were evaluated during two successive growing seasons at Sakha Agricultural Research Station, Kafr EI-Sheikh Governorate for the following traits: seed cotton yield/plant, lint yield/plant, boll weight, number of open bolls/plant, lint percentage, seed index and lint index. The results revealed that partition of the three-way crosses mean squares to its components predicted the significant contribution of additive, dominance and epistatic variances in the genetic expression of yield and its components. Giza 86 and Giza 89 varieties were t he best general combiners a sap arent a ndlor grand parent in the three-way crosses for yield and yield components. Therefore, these parental varieties could be utilized in a breeding program for improving these traits to pass favorable genes for improving hybrid and subsequently producing improved genotypes through the selection in segregating generations. The best combinations as grand parents (parent's of single cross) were a result of crossing poor x poor and/or good x poor general combiners in most of stuc!ied traits. Thus, it is not necessary that parents having high general combining ability effect (gk) would also contribute to ,igh speciflc combining ability effects (dij).The combinations [(Giza 76 x Giza 87) x Giza 85, (Giza 76 x Giza 77) x Giza 89, (Giza 86 x Giza 89) x Giza 85, (Giza 86 x Giza 76) x Giza 87, (Giza.86 x Giza 77) x Giza 85, (Giza 80 x Giza 87) x Giza 89, (Giza 85 x Giza 77) x Giza 87, (Giza 86 x Giza 87) x Giza 77 and (Giza 89 x Giza 87) x Giza 85J appeared to be the best promising three - way crosses for breeding toward improving the yield traits potentiality. Most of these combinations involved at least one of the best general combiners for yield. In addition, the results showed that field and its components were mainly controlled by adC!itive variance as well as additive x dominance and dominance x dominance epistatiC variances, while the other components play the minor role in the inheritance of these traits. Thus, the selection within the advanced generations of the previous three-way crosses may be effective for improving yield components. | ||||
| Keywords | ||||
| Triallel analysis; Gene action; Cotton; Combining ability | ||||
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