Atnaf et al

Inheritance of primary yield component traits of common beans (Phaseolus Vulgaris L.): Number of seeds per pod and 1000 seed weight in an 8 × 8 diallel cross population Thirty six (36) genotypes (eight parents and 28 F 1 diallel crosses) were grown in randomized complete block design with two replicates during 2006 at Mandura, North western Ethiopia. The experiment was executed to study the inheritance of two primary yield component traits: number of seeds per pod and 1000 seed weight. Statistical significant difference was observed between genotypes, parents and crosses for the traits considered. The mean square due to general combining ability was significant for the two traits. However, specific combining ability mean square was significant only for number of seeds per pod. Thus, both additive and non-additive types of gene actions were important in the inheritance of number of seeds per pod. Significant b 1 component was obtained for number of seeds per pod. The b 2 and b 3 components however, were insignificant, suggesting the absence of gene asymmetry. From Wr/Vr graph, inheritance of seeds per pod was governed by partial dominance with additive gene action.

Acta horticulturae, 2009

Three-year (2003-2006) investigations were conducted to study the inheritance of some common bean (Phaseolus vulgaris L.) traits in the cross A 195 x Kristal 137. It was found out that most of the investigated traits: height of plants, weight of over grounded plant parts, number of branches, pod-bearing nodes and pods, height of placement of the first pod, length and width of pods, number of seedbuds and seeds, mass of seeds, mass of one seed and length of seeds were with higher degree of inheritance. This is an important indication for successful selection according to these traits. The coefficients of inheritance of the traits-length of pod peak (23,08%) and weight of pods per plant (25,74%) were lower but over 20%. The number of branches was stronger influenced by the environmental conditions. The characteristics: number of seeds in pods, weight of pods with seeds, size and number of pods, number of pod-bearing nodes and weight of over grounded plant parts were controlled by the genotype and environmental conditions in equal degrees. The influence of the genotype was determining for manifestation of traits-size of seeds and pods as well as the number of pods placed under 10 cm. The characteristics: number of seeds in pods, weight of pods with seeds and number of pods per plant are of great importance for the formation of common bean yields, but they showed higher variability in our investigations. It is known that the high level of inheritance, in wide sense, is important for the first steps in selection-the choice of elite plants with desired traits. Coefficient of inheritance, in narrow sense, is important in the second part of selection-creation of new breeding lines with better combinations of desired traits.

Genetic analysis was done in a 7 × 7 half diallel population of French bean for eight yield contributing characters. Both additive and non-additive genetic components were responsible in the genetic system controlling yield and its component characters but nonadditive gene action was predominant, which was also confirmed by low values of narrow sense heritability estimates for most of the characters. The heritability in narrow sense was the highest for 100 seed weight and days to 50% flowering. Vr-Wr graph revealed the existence of enough genetic variability in the inbred parents studied, which is essential for improvement of a crop. The regression line passed over the origin for most of the character except days to maturity indicates the presence of partial dominance. The parents PB 82 and PB 125 contain most of the dominant genes and PB 154 and PB 155 contain the excess of recessive genes.

Plant Breeding, 1988

Genetic variance, heritabilitv, and ex,pected response from selection are useful in devising alternative methods and criteria of selection. The obiectives of this study "^'ere to estimate these foT seed yaeld and Its components from 200 E^ populations involving 80 cultivars and lines of mostly small-seeded dry bush bean {Phaseolus vulgaris L.) of habits growth I. 11. and III of Middle-American, origin. , A11 cultivars and lines were crossed in eight sets of ten parents each in a Design II mating system. The F; populations, without parents, were evaluated in the field in a replicates-in-sets design at two locations in Colombia m 1983.

Journal of Applied Biosciences, 2013

Objective: A study to estimate better parent and economic heterosis in an 8x8 diallel crosses of common beans (Phaseolus Vulgaris L.) was undertaken at Mandura, North Western Ethiopia. Methodology and Results: Eight parents and their 28 F1 diallel crosses were grown in a randomized complete block design. Yield and its components, architectural, and phenological traits were considered. Statistically significant differences were observed between the 36 genotypes for most of the traits studied. Analysis of better parent and economic heterosis respectively revealed 16 and 14 crosses out of 28 showed significant heterosis for yield per plant. Among which 12 and 7 crosses in the same order were positive. The extent of better parent heterosis for yield ranged from-31.14% (Dimtu x Tabor) to 114.1% (MAM-41 x Tabor). The maximum economic heterosis (60.58 %) was observed from the hybrid MAM-41 x Tabor .Significant (P<0.05 or P<0.01) better parent heterosis was also observed for yield-associated traits. Conclusions and recommendation: In this study, expression of significant better parent heterosis for grain yield and other important traits was frequent in combinations of parents from different growth habits (MAM-41 x Tabor, Roba-1 x SK 93263), seed color (Tabor x Red wolayta, BELDAKMI RR 5 x SK 93263, Dimtu x Zebra), and seed size (Roba-1 x Tabor). The extent of percent better parent and economic heterosis like in the cross MAM-41 x Tabor with 114.103 % seed yield better parent heterosis and 60.6 % economic heterosis suggested that this hybrid could be further considered in the breeding program aiming both for segregant breeding and hybrid development.

Genetica, 1978

Seed size inheritance was studied in a cross between a wiId accession and a cultivated variety of Ph, vulgaris L The 4 seed traits considered folIow a multigenic type of inheritance. At least ten factors or blocks of factors are responsabIe for the observed differences in seed size. The additive gene effects play a predominant role in determining the seed differences between wild and cultivated forms. Heterosis and inbreeding depressions are of minor' importance. Heritability is h&h, emphasizing the environmental stability of the seed related traits. The data help in understanding the evolution of this species under anthropic selection.

African Journal of Biotechnology, 2018

This experiment was conducted to evaluate 36 common bean genotypes including seven released varieties to generate information on the extent of genetic variability, heritability and expected genetic advance of yield and yield related traits. The field experiment was conducted in 2015 at two locations (Abaya and Yabello) and genotypes were planted in triple lattice design. Data were collected on yield and important agronomic traits. The estimated genotypic (GCV) and phenotypic (PCV) coefficient of variations ranged from 4.82 to 9.85% and 7.03 to 12.93%, respectively for combined analyses. The PCV values were relatively greater than GCV in magnitude for all traits, of which the magnitude of the differences were large for grain yield, seeds number per plant and number of primary branches, but was relatively low for plant height and number of seeds per pod. Broad sense heritability ranged from 18.29 to 58.6%, and genetic advance as percentage of mean ranged from 4.25 to 14.42%. Only plant height and seed number per pod had moderate heritability coupled with relatively high genetic advance values.

Research & Reviews: Journal of Botany , 2021

This experiment was conducted in Guraghe and Siltie Zones of Southern Ethiopia to assess the extents of variability and associations of characters among common bean genotypes. Data were collected on nine quantitative traits. The analysis of variance revealed significant variation among the traits. Moderate genotypic and phenotypic coefficient of variation was observed for 100 seeds' weight, pod length and seed per plant. Highest heritability and genetic advances as percent mean values were observed for 100 seeds' weight and pod length. Seed yield had positive and significant association with most traits at both phenotypic and genotypic levels. The maximum positive direct effects on seed yield were exerted by pods per plant and days to 90% maturity. The moderate positive indirect effect on seed yield was exerted days to 90% maturity through pods per plant. Four major PCs explained 79.72% of total variation. Pod per plant from all PCs, seed yield and days to 90% maturity were from PC1, seed per pod and days to 50% flowering from PC1 and PC2, plant height from PC2 and PC3 and seed per plant from PC1, PC3. Therefore, in future these traits would be used for selection of genotypes as improving seed yield among these common bean genotypes.

2011

The present study was conducted at the University of Agronomic Sciences and Veterinary Medicine Bucharest, during the 2009 growing season and were evaluated four hybrid population: (Ami x SEA13)F2, (Starter x SEA13)F2, BC1 -1(F1 x Ami), BC –2( F1 x Starter). The aims of this work were to estimate the variance components, phenotypic and genotypic coefficients, heritability for seed yield and its components (pods number per p lant, seeds number per pod, 1000-seed weight, seed yield per plant) and e xpected genetic advance as indices for yield selection in common bean. The highest proportion of genetic variance presented a number of seed per pod in both crosses (crosses 1 Vg = 40%; crosses 2 Vg = 50%). Amongst the yield characters, a very small difference between GCV% and PCV% was observed for the character seeds number per pod in both crosses and both generations. Large difference between GCV% and PCV% was observed for the number of seed characters per plant, 1000-seeds weight and see...

African Journal of Agricultural Research, 2019

Knowledge of the sources and magnitude of variability among genotypes plays a pivotal role in any crop improvement program to maximize gains from selection. This experiment was conducted at Bako Agricultural Research Center in 2011 cropping season with the objective of studying and estimating the extent of genetic variability in common bean genotypes under sole and mixed cropping systems. Meanwhile, the wider range of variability observed from the mean of various quantitative traits. The genotypes that varied by cropping system depicted the presence of high level of variability. The highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) values were recorded for hundred grain weight (29.56 and 35.46 g), biological yield (27.22 and 31.37) and grain yield (26.60 and 31.54 q/ha), whereas the lowest GCV and PCV values were recorded for days to maturity of sole common bean genotypes. Phenotypic variance in both sole and mixed cropping systems was higher than that of genotypic variances. This implies that, considerable contribution of environmental factors to the phenotypic expression of the genotypes. High broad sense heritability as observed under both sole and intercropping systems indicated that, genetic improvement can be obtained through further selection programme. Important agronomic traits: pods per plant, seeds per pod and branches per plant had positive and significant correlation with grain yield in most cases. Path coefficient analysis at genotypic level indicated that all traits except plant height, seeds per pod and hundred grain weights exerted their positive direct effect on grain yield. Hence, the current study identified the presence of wide variability between those common bean genotypes which can be used for further breeding program and selection can be made using those traits associated to yield.