Two Selection Methods and Estimation of some Important Genetic Parameters in Broad Bean (Vicia faba L.)

Genetic Variability on Grain Yield and Related Agronomic Traits of Faba Bean (<i>Vicia faba</i> L.) Genotypes Under Soil Acidity Stress in the Central Highlands of Ethiopia

“…The high variation between PCV and GCV for chocolate spot was because of environmental stress. Similarly, narrow PCV and GCV variation in faba bean have been reported by various authors and they stated that variability due to the genetic constitution of the genotypes was more than variability exerted by environmental factors [13,14]. However, traits like chocolate spot that have high PCV values than GCV implies greater influence of environmental factors for the phenotypic expression of these traits that make difficult or practically impossible to exercise selection based on phenotypic performance of the genotypes to improve the traits.…”

“…Genetic advance in absolute unit (GA) and percent of the mean (GAM), was estimated in accordance with the methods illustrated [25]. Genetic advance that is expected from selecting the top 5% of the tested genotypes as percentage of the mean (GAM) was categorized as low (0-10), moderate (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and high (>20). Where, k = selection differential (at 5% selection intensity with value 2.06) σp = phenotypic standard h 2 = heritability; x = Grand mean.…”

“…The knowledge of phenotypic (PCV) and genotypic (GCV) coefficients of variation helps to determine the type of breeding strategy to be followed [12]. The close correspondence between the GCV and PCV variation in faba bean has been reported that variability due to the genetic constitution of the genotypes was more than variability exerted by environmental factors [13,14]. The high phenotypic and genotypic coefficients of variation is an indication of the less influence of environmental factors in the expression of traits and the higher chance to improve the traits through selection breeding [15].…”

Mass selection of fonio landraces (Digitaria exilis) grown in Benin: Pathway, homogeneity assessment and genotypes screening

“…These results are similar to those of Belete et al (2017) who also noted high genetic gains in the yield of eight (08) new varieties compared to one old variety of chickpea in Ethiopia. Unlike morphometric traits, these results on the progress achieved show somewhat the effectiveness of homogenization and mass selection method applied to these agro-phenological traits (Abreu et al, 2010;Belete et al, 2017;Solieman & Ragheb, 2014).…”

“…The response to the selection of such measurable traits also depends on the level of their heritabilities (Acquaah, 2007; Assefa et al., 2001). The morphometric characteristics of such categories could, therefore, have been less homogenized by the mass selection method adopted (Abreu et al., 2010; Solieman & Ragheb, 2014). This result confirms the fact that quantitative characters are more difficult to select than qualitative traits in a breeding programme (Acquaah, 2007).…”