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Cluster analysis in rapeseed (Brassica napus L.)

Show simple item record Kamundia, John Waweru Mahasi, Mabel Jendeka 2016-10-03T06:20:17Z 2016-10-03T06:20:17Z 2007-07
dc.identifier.citation Mahasi, M. J., & Kamundia, J. W. (2007). Cluster analysis in rapeseed (Brassica napus L.). African Journal of Agricultural Research, 2(9), 409-411. en_US
dc.description.abstract Many oilseed crops (e.g. sunflower, soybeans, rapeseed/mustard, sesame, groundnuts etc) are grown in Kenya. But oilseed rape is preferred because of its high yields (1.5 tons – 4.0 tons/ha) with high oil content of 42 – 46%. It is soft seeded hence oil extraction is relatively easy. The meal is high in protein and very useful in livestock feed supplementation. The success of any crop improvement programme depends on the extent of genetic diversity in the material. Hence, it is essential to evaluate introductions for adaptation and study the similarities if any among them. Evaluation trials were carried out on 17 rapeseed genotypes (nine of Canadian origin and eight of European origin) at 4 locations in Kenya namely Endebess, Njoro, Timau and Mau Narok for two years. An analysis of variance was carried out on seed yields which indicated that the genotypes were significantly different (LSD, 0.05). Cluster analysis based on mean seed yields suggested only one major group existed within the material. In the first year, genotypes 2, 3, 8 and 9 didn’t group with the rest. Genotype 8 was the only one that did not classify with the rest of the Canadian genotypes. Three European genotypes (2, 3 and 9) were however not classified with the others. In the second year, genotypes 10 and 6 didn’t fall in the major cluster. Of these two, genotype 10 is of Canadian origin. Genotypes were more similar in the second year than the first year due to favorable weather. It is evident that genotypes from different geographical areas, that is, Europe and Canada fell in the same clusters suggesting that they have genetic similarity. The groupings indicated no correspondence between geographical diversity and clustering pattern. en_US
dc.language.iso en en_US
dc.subject Genetic diversity en_US
dc.subject cluster analysis en_US
dc.subject genetic similarity en_US
dc.subject cluster pattern en_US
dc.title Cluster analysis in rapeseed (Brassica napus L.) en_US
dc.type Other en_US

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