EVALUATION OF COWPEA PARENTAL AND HYBRID GENOTYPES FOR HETEROSIS AND INBREEDING DEPRESSION | ||||
| Journal of Plant Production | ||||
| Article 9, Volume 30, Issue 7, July 2005, Page 3773-3782 PDF (1.31 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237420 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Suzan A. Swidan | ||||
| Horticultural Crops Research Institute, Agric. Research Centre, Egypt | ||||
| Abstract | ||||
| Five parental genotypes of cowpea (Vigan sinensis L). four F ,'s and their F2'S were used to study their performances, heterotic effects, inbreeding depression and degree of dominance for eleven vegetative and yield characters. The mean values of the five parental. four F,'s and F2'S genotypes indicated tnat in VR. (P.), F, (VR4 x VR~) (P.XP3) and F2 (P.XP3), the genes controlling almost all the studied characters are expressed as increasing genes for these characters either as a parental genotypic background or in combination with P3(VR3) either in the F, and the F2 of Ihe cross (P.XP3)' Moreover, the F, (P .xP3) had the highest heterotic values over both the mid and the better-parent for pod weight, number of pods and seed weight per plant. In addition. the F2 (P.xP3) had the highest mean values for eight characters out of eleven and had also a considerable high values for the other three characters. This F2(P.XP3) also showed negative and significant inbreedinq depression for seven characters out of the eleven in relation to the mid-parental values. Significant degree of dominance values in nine characters out of the eleven were observed for both the F2 (P.xP3) and F,(P6XP,). Meanwhile, each of F2(P30XP.} and F2(P20XP,.) showed significant degree of dominance values in eight out of the eleven characters. These results strongly :".,;ge5t that F, (P .xPJ) would have the potential to be used in cowpea breeding i'! cqrarns. | ||||
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