Genetic Variability and Association among Seed Yield and Yield Related Traits in Ethiopian mustard (brassica carinata A. Braun) at Haramaya University Campus, Raare Site, Eastern Ethiopia

Genetic Variability and Association among Seed Yield and Yield Related Traits in Ethiopian mustard (brassica carinata A. Braun) at Haramaya University Campus, Raare Site, Eastern Ethiopia

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Title: Genetic Variability and Association among Seed Yield and Yield Related Traits in Ethiopian mustard (brassica carinata A. Braun) at Haramaya University Campus, Raare Site, Eastern Ethiopia
Author: Bayou, Na’ol
Abstract: Ethiopian mustard (Brassica carinata A. Braun) or gomenzer is an oilseed crop that is well adapted to the highlands of Ethiopia. Cultivation of Ethiopian mustard, as an oilseed, requires genetic improvement which relies on its genetic diversity and interrelationships among traits. The present study had objectives, to assess the extent and pattern of genetic variability in Ethiopian mustard genotypes, to estimate heritability and genetic advance under selection, to estimate the association among seed-yield and yield related traits and partition the genetic correlation coefficients into direct and indirect effects. A total of 25 accessions of Ethiopian mustard originating from diverse agro ecological locations of Ethiopia were used for this study in RCBD. Among the tested genotype there were three released varieties. The genotypes were obtained from Holleta Agricultural Research Centers of Ethiopia. Data were collected on 11 characters. The analysis of variance showed highly significant (p0.01) difference for all characters, indicating the existence of variability and the potential for selection and improvement within characters. High phenotypic coefficient of variation (PCV) was recorded for seed yield per plot, biomass per plot and seed yield per plant. The magnitude of PCV and genotypic coefficient of variation (GCV) were high for seed yield per plot, biomass per plot and secondary branch per plant. Heritability estimates were high for day to flowering, 1000-seed weight, plant height, biomass per plot and seed yield per plot. Similarly, heritability values for primary branches per plant were also high. High heritability estimate was coupled with high genetic advance as percent of mean for biomass per plot and seed yield per plot. This indicates the effectiveness of selection to improve these two characters. Correlation and path coefficient analysis were used to determine characters associations. Seed yield per plot showed positive and significant associations with biomass per plot, harvest index per plot, plant height, harvest index per plant and seed yield per plant. This indicated that simultaneous improvement of seed yield per plot and these characters is possible. With regard to seed yield per plant, positive associations were observed with harvest index per plant, 1000-seed weight and biomass per plant. Among the characters considered, day to flowering exhibited negative correlation with seed yield per plot. Correlation and path coefficient analysis of seed yield per plot and seed yield per plant revealed that biomass and harvest index had strong and positive correlations and also exerted favorable direct effects on seed yield at phenotypic and genotypic levels. Selection for biomass and harvest index therefore can be very useful for seed yield improvement. Furthermore, plant height and 1000-seed weight could be useful for indirect selection of seed yield.
Description: 69p.
URI: http://hdl.handle.net/123456789/3263
Date: 2015-05


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