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| dc.contributor.author | Desalew Wondiferaw | |
| dc.date.accessioned | 2025-05-26T07:53:10Z | |
| dc.date.available | 2025-05-26T07:53:10Z | |
| dc.date.issued | 2024-11 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/16731 | |
| dc.description.abstract | Rice (Oryza sativa L.) is one of the most important staple crops in the world, serving as a primary source of food for over half of the global population, though it has relatively short history of production and research in Ethiopia. Hence, genetic improvement is of paramount importance to increase the production and productivity of the crop, which requires understanding of genetic variability in the crop. The study was conducted during 2023/2024 main cropping season at Pawe Agricultural Research Center, Ethiopia, to determine the magnitude of genetic variability and interrelationships of yield and yield related traits in 80 upland rice genotypes.in an alpha lattice design with two replications, focusing on genetic analysis of variance showed significant differences among genotypes for 12 traits such as DH, DM, PH , PL, NPT ,NFGPP, BM, HI, TSW, SW and GSP .The highest genotypic variation (12.85) and phenotypic variation (20.51) was recorded for the number of productive, tiller per plant while the lowest GCV (0.96) and PCV (1.44) was recorded for days to maturity. Broad sense heritability value ranged from 80.18% for plant height to 29.51% for seed width. High genetic advance as a percent of the mean was observed for the number of productive tillers, plant height, grain yield, and thousand seed weight, indicating the presence of additive genes, making selection based on these traits successful. The highest positive correlations with grain yield were found for harvest index, biomass, and number of fill grains per panicle at both genotypic and phenotypic levels (r = 0.829, r = 0.541, r = 0.439). These indicated that improving upland rice through selection would be effective considering these traits. Path coefficient analysis revealed the maximum positive direct effect of harvest index and biomass yield on grain yield, indicating that considering these traits during the selection of rice genotypes would be more rewarding in evolving potential varieties of upland rice. The first five principal components with Eigen values greater than one accounted for 77.23% of the total variation among genotypes. Cluster analysis showed that genotypes were grouped into five clusters with the maximum inter-cluster distance between clusters IV and II (D2 = 2813.08), while the minimum inter-cluster distance was between clusters II and V (D2 = 574.91). Six rice genotypes with grain yield above 57.5 - 61.9 qt/ha-1 have been identified and based on the data for future breeding program that employ hybridization, parental material selection should be carried out between clusters rather than within clusters | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Plant Breeding | en_US |
| dc.title | Genetic Variability and Association Traits among Upland Rice (Oryza Sativa L.) Genotypes in Benishangul Gumuz, North Western Ethiopia | en_US |
| dc.type | Thesis | en_US |
