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- 저자 : Keneni Gemechu (검색결과 2 건)
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Tamene T. Tolessa,Gemechu Keneni,Hussein Mohammed,Seid K. Ahmed 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.3
Thirteen faba bean varieties including 11 released between 1977 and 2007 and two promising genotypes were evaluated at seven contrasting environments in the central and southeastern highlands of Ethiopia during the main cropping seasons of 2007/2008 and 2008/2009. The objectives of the study were to evaluate temporal genetic progresses made over three decades of breeding in patterns of GxE interaction and performance stability of the varieties developed in due course for grain yield and seed size of faba bean. The study was conducted using a randomized complete block design with four replications. Regression coefficients (bi) of genotypes over years of release as a stability parameter showed a steadily but smoothly decreasing trend at the rate of 9.0x10-3 year-1, indicating that varietal performance stability increased with time. Trend analysis based on AMMI stability value (ASV), genotypic selection index (GSI), Shukla stability variance, and Kang’s rank sum (KRS) values of grain yield also revealed an increasing yield stability over the years of release. For seed size, GSI and KRS values decreased with time. The coefficient of variability (CV) for grain yield and seed size also tended to temporally decline while sustainability index (SuI) increased across the year of releases indicating that there was no performance stability sacrificed to achieve the greater yield potential with larger seed size. Therefore, this data support that selection of new genotypes that yield well at multiple environments, specifically genotypes with large seed size and resistance to disease as a method to increase performance stability.
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Genetic diversity of Sesame (Sesamum indicum L) using high throughput diversity array technology
Tesfaye Tewodros,Tesfaye Kassahun,Keneni Gemechu,Ziyomo Cathrine,Alemu Tesfahun 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.4
Sesame is an important oil crop widely cultivated in Africa and Asia. Characterization of genetic diversity and population structure of sesame genotypes in these continents can be used to designing breeding methods. In the present study, 300 genotypes comprising 209 Ethiopian landraces, and 75 exotic collections from diferent African and Asia countries, and 16 varieties were used. The panel was genotyped using two high-throughput diversity array technology markers. A total of 6115 silicoDArT and 6474 SNP markers were reported, of which 5065 silicoDArT and 5821 SNP markers were aligned with the reference sesame genome. For further analysis, it was fltered with an allele frequency for each SNP site and left 2997 highquality SNPs. All genotypes used in this study were descended from eight geographical origins. The average diversity of the panel was 0.14. Considering the genotypes based on their geographical origin, Africa collections (0.21) without Ethiopian collection was more diverse, when further portioned Africa, North Africa (0.23) collection was more diverse than others, but at the continent level, Asia (0.17) was more diverse than Africa (0.14). The genetic distance among the populations was ranged from 0.015 to 0.394. The populations were clustered into four groups. The structure analysis was divided into four hypothetical ancestral populations and 21 genotypes were an admixture. This indicate genotypes from the same origin didn’t classify on the country of origin. The genetic diversity and population structure guide future research work to design association studies and the systematic utilization of genetic resource.
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