Papers by Mulugeta Atnaf Tiruneh
Estimation of better parent and economic heterosis for yield and associated traits in common bean... more Estimation of better parent and economic heterosis for yield and associated traits in common beans ABSTRACT 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.
An experiment to study adaptability and stability of introduced kenaf (Hibiscus cannabinus) culti... more An experiment to study adaptability and stability of introduced kenaf (Hibiscus cannabinus) cultivars for fiber yield was undertaken at different environments of Ethiopia in the 2011 main cropping season. Seven kenaf commercial cultivars introduced from Israeli and USA along with one local check were grown in randomized complete block design with four replicates. The combined analysis of variance over environments showed kenaf fiber yield was significantly affected by environments (E), genotypes (G) and genotype x environment (GE) interactions. The first two principal components (PC1 and PC2) of the GGE explained 88.3% of the sum of squares using environment standardized model. GG-2 from Israeli and the local check had the highest mean fiber yield in that order. However, the local check was relatively most unstable compared with the rest of the genotypes. GG-2 showed both highest kenaf fiber mean yield and stability performance and also was the winner in four of the five test environments. Hence, it could be considered as most adaptable and stable cultivar. Test environments, Pawe and Awassa were the most discriminating of the genotypes and representative of all other test environments.
Objective: A study to estimate better parent and economic heterosis in an 8x8 diallel crosses of ... more 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.
The study was undertaken with the objective to examine the nature and to quantify the magnitude o... more The study was undertaken with the objective to examine the nature and to quantify the magnitude of genotype x environment interaction effects on soybean [Glycine max (L.) Merr.] grain yield and to determine the winning genotype (s) for test environments in north western Ethiopia. The experiment was executed at four different locations of Ethiopia for two consecutive years (2007 and 2008) using thirty two genotypes including two checks. Randomized complete block design with three replicates was employed. The combined analysis of variance over environments explained soybean grain yield was significantly (p<0.001) affected by environments (25.58%), genotypes (14.87%) and genotype x environment interaction (59.55%). The result depicted differential performance of soybean genotypes at different test environments and hence the interaction was crossover type. The genotype main effect plus genotype x environment interaction (GGE) biplots were applied to analyze and visualize pattern of the interaction component. The first two principal components (PC1 and PC2) of the GGE explained 63.4% with PC1=41.6 and PC2=21.8 of the GGE sum of squares using environment standardized model. Genotypes, G13 (TGX-1998-29F), G3 (TGX-849-313D), and G7 (TGX-1889-29F) combined both high mean yield and high stability performance across the test environments and could be characterized as an ideal genotypes.
Thirty six (36) genotypes (eight parents and 28 F 1 diallel crosses) were grown in randomized com... more 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.
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Papers by Mulugeta Atnaf Tiruneh