Diallel analysis and separation of genetic variance components in eight faba bean genotypes
Abstract: The present investigation was carried out at Genetic Resources Department- Bahtim, to evaluate eight faba bean varieties in diallele crosses set. Twenty eight crosses were constituted in the 2011/2012 season, whereas parents and crosses were evaluated in 2012/2013, in a randomized complete block design with three replications. Results revealed highly significant variations within parents and F1 genotypes, indicating a wide genetic variability for the studied characters and the possibility of genetic improvement using such genetic pools of faba bean. Some crosses recorded significant desired heterotic percentages relative to mid parents and better parent for all studied traits except for number of branches per plant. Both general (GCA) and specific (SCA) combining abilities were significant for all studied traits revealing the important role of both additive and dominant components in the inheritance of the studied characters. The ratio of general and specific combining ability (GCA/SCA) indicated great additive effects for the majority of the studied characters. Giza 3 was proved to be a good combiner for all studied traits except for plant height and number of branches per plant. Several crosses exhibited significantly positive SCA effects for studied traits especially L.512 × NA112 and L.153 × Giza 3 which exhibited highest significant and positive SCA effects for seed yield per plant with high 100-seed weight and number of seeds per plant. Heritability in the broad sense (hb2 %) estimates was generally high for all studied traits. However, heritability in the narrow sense was high for number of pods per plant (76.42), 100-seed weight (75.53), plant height (70.53) and number of branches per plant (62.00), while it was low for seed yield per plant. High heritability values coupled with high genetic advance observed for 100-seed weight and number of pods per plant indicated that such traits would respond to selection. These two traits might contribute to the increasing seed yield since they are important yield components.
URL
Publication year 2014
Pages 147–154
Organization Name
Author(s) from ARC
Publication Type Journal
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