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Title: STUDIES ON GENETIC DIVERGENCE IN COMMON BEAN (Phaseolus vulgaris L.) INTRODUCTIONS OF ETHIOPIA
Authors: KASSAYE, NEGASH
Keywords: Genetic distance
Genetic diversity
Genetic variability
Germplasms
Correlation
Path coefficient analysis
Clustering
Date Added: 3-Sep-2007
Abstract: One hundred and forty four common bean (phaseolus vulgaris L.) germplasm introuctions were evaluated for their diversity in 18 agronomic and morphological traits using D2 statistics. High genotypic coefficient of variation (GCV) was observed for plant height, number of nodes on the main stem, 100-seed weight, number of pods per plant and internode length. For all the traits, estimates of phenotypic coefficients of variation (PCV) nwere higher than GCV, indicating presence of envirnomental influence. High heritanility and genetic advance was observed for plant height, number of nodes on the main stem and 100- seed weight. Seed yield has significant and positive association with biological yield, number of nodes on the main stem, days to flowering and days to maturity, whereas number of pods per plant, 100-seed weight and number of seeds per pod had the maximum direct effect on seed yield. The d2 value data can be uesed in cluster analysis to identify groups of related cultivars. The genotypes were grouped in nine clusters on the basis of D2 value. The clustering pattern was not influenced by the geagrpahic diversity of the germplasms. Two major clusters, which corresponded to Mesoamerican and Andean origin, were observed. The intra-and inter-cluster D2 values suggested that within cluster genetic diversity is narrow, but the genetic diversity among clusters is greater. Therefore, exploiting the diversity among clusters would broaden the genetic base of dry bean breeding popluations.
Description: A Thesis Submitted to the School of Graduate Studies of Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Applied GeneticApplied Genetics (Biology)
URI: http://hdl.handle.net/123456789/45
Appears in:Thesis - Biology

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