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| dc.contributor.author | Abraham Abawa | |
| dc.date.accessioned | 2022-01-17T12:27:35Z | |
| dc.date.available | 2022-01-17T12:27:35Z | |
| dc.date.issued | 2022-01-17 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12939 | |
| dc.description.abstract | An evaluation of genetic variability is useful for plant breeding and in the development of efficient crop genotypes for different conditions. Eighty-one upland rice (Oryza sativa L.) genotypes were tested for 15 quantitative traits in simple lattice design to assess the genetic variability and association among traits at Mecha district, Bahir Dar University research station, under irrigation condition in 2020/2021. Analysis of variance revealed the presence of significant differences among genotypes for all traits. Moderate to high genotypic and phenotypic coefficients of variation was exhibited by grain yield, biomass yield, harvest index, grain width, plant height, filled grain per panicle and primary branch per panicle; indicates that simple selection can be practiced for further improvement of these characters. Moderately high to very high estimates of heritability (>60%) coupled with high genetic advance (>20%) were obtained for plant height, number of primary branch per panicle, unfilled grain per panicle, biomass yield, harvest index, grain width and grain yield. This indicating that selection may be effective for these traits in order to obtain maximum genetic gain for yield improvement in rice by simple selection process. The phenotypic and genotypic correlations revealed that grain yield had positive and significant correlations with plant height, number of primary branch per panicle, filled grain per panicle, and biomass yield and harvest index on grain yield. Indicated that, considering these traits improving upland rice through selection would be effective. Path coefficient analysis revealed maximum positive direct effect of harvest index and biological yield on grain yield. This indicates considering of these traits during selection of rice genotypes would be more rewarding to evolve potential varieties of upland rice. The first six principal components with Eigen values (3.09, 2.83, 2.38, 1.36 1.11 and 0.96) accounted for 78.18% of the total variation among genotypes. Cluster analysis showed that genotypes were grouped into six clusters with maximum inter-cluster distance between cluster IV and II (D2 =77.7) and cluster III contains the desired genotypes that had better panicle length and grain yield. The result of this study demonstrated that there is considerable variability among the genotypes | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Plant Breeding | en_US |
| dc.title | GENETIC VARIABILITY AND ASSOCIATION OF TRAITS IN UPLAND RICE (Oryza sativa L.) GENOTYPES UNDER IRRIGATION CONDITION IN MECHA DISTRICT, NORTH WESTERN ETHIOPIA | en_US |
| dc.type | Thesis | en_US |
