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Articles by Berhane Lakew
Total Records ( 4 ) for Berhane Lakew
  Muez Mehari , Sentayehu Alamerew and Berhane Lakew
  Protein content is a prerequisite for malting quality and it is highly affected by environment. The objective of this study was to quantify the magnitude of genotype by environment interaction and assess the protein content of malt barley genotypes in diversified locations. Eight malt barley genotypes were evaluated in randomized complete block design using three replications at six locations of Tigray, Ethiopia durining 2013/2014 main cropping season. The additive main effect and multiplicative interaction effect model (AMMI) analysis revealed significant differences (p<0.01) for genotype, location and genotype by location interaction for protein content. The magnitude of location was twice the magnitude of genotype. Hence, the malt barley genotypes had not a consistent rank across location. The AMMI model clearly indicated the presence of large magnitude of genotype by location interaction which can be partitioned into four significant interaction principal components. The malt barley genotypes were best explained by the AMMI2. Therefore, this model is vital for protein content study in the area. According to the additive main effect and multiplicative interaction effect biplot 1 analysis and ranking biplot f the GGE the genotypes Holkler and Bekoji were stable for desirable protein content for malting. The AMMI1 biplot indicated that locations Korem, Emba-hasti and Astella were unfavorable having protein content less than the grand mean. However, Hashange Mekhan and Hagara-Selam were favorable with protein content greater than the grand mean. In the malting industry protein content is not the only indicator and other quality requirements have to be incorporated for full packaged recommendation of the malt barley genotypes.
  Muez Mehari , Sentayehu Alamerew and Berhane Lakew
  Eight malt barley genotypes were evaluated in randomized complete block design using three replications at six locations in Tigray region during 2013/2014 main cropping season. The objective of this study was to quantify the magnitude of genotype by environment interaction and yield stability of malt barley genotypes. The additive main effect and multiplicative interaction effect model (AMMI) analysis revealed significant difference (p<0.01) for genotypes, locations and genotype by location interaction. The magnitude of the testing location was greater than the genotype by location interaction and the genotype. This indicates that the testing locations were diversified in discriminating the genotypes. The AMMI model clearly demonstrates the genotype by location interaction by partitioning into two significant interaction principal components that capture 83.84% of the genotype by location interaction. According to the stability analysis of the additive main effect and multiplicative interaction effect Stability Value (ASV) and the AMMI 1 biplot analysis the genotype Bekoji and Fire-Gebs were the most stable coupled with higher grain yield greater than the grand mean where as the genotypes Sabini and HB-1533 were unstable. Using the AMMI 1 biplot analysis, the testing locations, korem, Hashange, Mekhan and Emba-hasti were favorable testing locations whereas Hagara-Selam was unfavorable testing location.
  Zerihun Jalata , Firew Mekbib , Berhane Lakew and Seid Ahmed
  Background and Objective: Scald caused by Rhynchosporium cummune is among the most important disease causing significant yield losses in barley yield. The aim of this study was to investigate the nature of gene actions and combining ability of parents which is useful in designing effective breeding for scald resistant barleys. Materials and Methods: The present study was carried out on 28 barley genotypes (21 F1 crosses and 7 parents) at Holetta, Ethiopia, in two rows of 2.5 m plot length and 0.40 m width at 0.15 m spacing between plants in RCB design with three replications during 2015 main cropping season. Results: The analysis of variance for initial and final percentage ld severity and AUDPC for scald showed highly significant genotypic difference indicating suitability for improvement. The combining ability test showed highly significant variation due to general (GCA) and specific combining ability (SCA) indicating the importance of both additive and non-additive types of gene effects controlling scald resistance. It appears that HB42 and HB1307 with highly significant and negative GCA effects can be promising parents for development of scald resistance and about half of the F1 hybrids also showed negative heterosis estimates over mid parent for all the characters measured. Conclusion: The result suggested that, the resistant additive alleles found in HB42 and HB1307 parents would be fixed using diallel selective or biparental mating of segregants followed by selection.
  Zerihun Jalata , Firew Mekbib , Berhane Lakew and Seid Ahmed
  Background and Objectives: Barley is one the most important crops worldwide mainly for food, feed and drinks including Ethiopia. The aim of this study was to assess the combining ability of barley parents and estimate the inheritance pattern for some agro-morphological traits for future breeding. Materials and Methods: This study was carried out on 28 barley genotypes (21 F1 and 7 parents) in a randomized complete block design with three replications during 2015 cropping season at Holetta, Ethiopia. Results: There was significant difference due to both GCA and SCA among barley genotypes for all the characters studied except for days to heading, days to maturity and grain yield per plant which had non-significant SCA revealing the predominance of additive gene effects to non-additive gene effects for all characters except for thousand kernel weight. Every barley parents were best general combiners for one or more important agronomic characters. Large range of heterosis values (-23.8 to 86 and -40.6 to 43.2%) for grain yield per plant over mid parent and better parent, respectively. Conclusion: The finding suggests that yield can be improved through multiple crossing of parents with best GCA effects for the desired characters followed by selection at later generation.
 
 
 
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