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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2703

Advisors: Dr. Adugna Wakjira
Dr. Kifle Dagne
Keywords: Clustering genotypes,
genetic diversity
linseed (Linum usitatissimum L.)
soil acidity
Copyright: Jun-2010
Date Added: 6-May-2012
Abstract: Abstract Linseed (Linum usitatissimim L. 2n = 30) is the second most important oilseed crop in production after noug in the higher altitudes of Ethiopia. It is suited to a wide range of soil types but it is sensitive to and performs poorly on the acidic soils. Sixty-four linseed genotypes, consisting of six exotic, one standard check and 47 single plant selection from different crosses were evaluated by simple lattice design with two replications for their tolerance to acidic soil at Bedi Trial Site in Central Ethiopia during 2009/2010 cropping season. Data were collected for 14 characters and statistically analyzed. Analysis of variance showed significant differences among the genotypes for root length, days to flowering, days to maturity, plant height, seed yield per plot, seed yield per plant, tillers per plant, number of primary branches per plant, 1000 seed weight, oil yield and oil content. However, the numbers of capsules per plant and secondary branches per plant were non-significant. High phenotypic and genotypic coefficients of variations were recorded for seed yield per plant, seed yield per plot, oil yield per plot, number of primary branches and tillers per plant. Conversely, oil content, 1000 seed weight, days to flowering and days to maturity showed low phenotypic and genotypic coefficient of variations. Heritability in the broad sense is adequately high for all characters and comparatively higher heritability was observed for oil content, 1000 seed weight and days to maturity. Relatively, higher heritability was coupled with high genetic advance for days to flowering, days to maturity, plant height, capsules per plant and vigourisity. High heritability, associated with low predicted genetic advance, was estimated for oil content, seed yield per plant, 1000 seed weight, root length, tillers per plant, primary and secondary branches per plant. Simple correlation coefficient analysis revealed that seed and oil yields (kg/ha) had positive and significant correlation with seed yield per plant, tillers per plant, primary and secondary branches, capsules per plant, and vigourisity. Significant and positive correlation was observed for oil content only with 1000 seed weight but negative correlation with vigourisity and tillers per plant. Positive and significant correlation of days to maturity with root length and plant height was observed. Root length had positive and significant correlation with days to maturity, plant height, seed yield per plant, tillers per plant, vigourisity of plants, seed yield per plot, primary and secondary branches per plant, capsules per plant and oil yield. The study showed that linseed genotypes with longer root lengths such as Omega X CI-1525/B/3, Chilalo X R-12-N27G/P2/S2, CDC- 1747XCI-1652/S2, PGRC/E10306 X Chilalo/B/4, etc., were among higher seed yielders. In general, seed yield of the genotypes increased with increase in root length and these genotypes are thought to be more tolerant to acidic soil. Cluster analysis of genotypes from six different sources grouped them into seven different classes. Analysis of Mahalanobis’s D2 showed significant genetic distances between all clusters except between the first and the second clusters. Generally, no clear cut relationship was observed among different sources of genotypes since genotypes from the different sources of origin fell into the same cluster and genotypes of the same source were distributed into different clusters, indicating that genotypes from the same origin may have different genetic background and vice-versa. Principal component analysis revealed that seed yield per hectare, oil yield per hectare, vigourisity of plants and oil content were the most determining characters in grouping genotypes into the clusters.
URI: http://hdl.handle.net/123456789/2703
Appears in:Thesis - Biology

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