INBREEDING DEPRESSION AND EXPECTANT GENETIC ADVANCE IN F2 HYBRIDS FABA BEAN (Vicia faba L)
Mesopotamia Journal of Agriculture,
2017, Volume 45, Issue 4, Pages 69-84
AbstractThe study aimed to evaluate the performance of hybrids and their parents for identify promising hybrids and the objectives to develop single cross hybrids in addition to estimate inbreeding depression , some genetic parameters , phenotypic and genotypic correlation for the studied characters. An experiment was conducted by using four varieties of faba bean (Vicia faba L.) viz., 1- French (Aguadulce) 2- Syrian (Shami) 3- Spain and 4- Holland , were Full diallel crossing carried out according to (Griffing 1956) first method (Model I) to produce F2-Hybrids of twelve single hybrid from self pollination of F1 hybrid during the growing season 2009/2010. The parents and F2 hybrid were planted by using Randomized Complete Block Design (R.C.B.D.) with three replications at vegetable field of the Horticulture and landscape design department , College of Agriculture and Forestry , Mosul University , during the growing season 2010/2011.
Results showed that parents and F2S were significantly different for all the studied characters , parent 1- French (Aguadulce) was found to be the best for green , dry pods yield , seeds yield and biological yield , whereas the hybrid (2×3) for the green , dry pods yield and seeds yield , while the hybrid (2×1) for the biological yield. F2 hybrid exhibited a significant inbreeding depression for all the studied characters. A significant additive variance were found for all studied characters except date flowering and no.of seeds per pod. Narrow sense heritability was higher for: Plant height , no.of branches/plant , pod length , 100 seed weight , green , dry pods yield and seeds yield , which indicated an additive gene action for these characters. Over dominance were found for: flowering , maturity date , no.of pods/plant , no.of seeds per pod and biological yield. Genetic advance expectant in F3 hybrid were found for most studied characters , which indicates the importance of selection for improving these characters. The higher phenotypic and genotypic correlation were found between dry pods yield and seeds yield.
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