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Abstract Detail


Population Genetics

Adewale, Daniel B. [1], Kehinde, O.B. [2], Popoola, J.O. [3], Dumet, D.J. [1].

Genetic Relationships among seed traits of African yam bean (Sphenostylis stenocarpa Hochst. Ex. A. Rich) Harms).

Selecting for quantitative traits that are highly correlated with others has been found advantageous in genetic improvement. Variations among eighty genotypes, six quantitative seed characters and the correlation and relationship between the seed characters were evaluated on African yam bean (AYB). The characters were: seed length, seed width, seed thickness and their ratios: seed length : width (LW), seed length : thickness (LT), seed width : thickness (WT). There were significant differences (P < 0.05) among the eighty genotypes for the characters studied. The comparison of the six characters in all possible pairs indicated very high significance (P < 0.0001), approving the six traits as unique parameters for evaluating AYB. The proportion of total variation due genetic ranged from 90% in WT to 97% in seed length. The high broad sense heritability (81 94%) and genetic advances (14 31%) indicated substantial contribution of additive genetic variance in the expression of the six traits, suggesting high possibilities for their genetic improvement through selection. Joint inheritance among traits as depicted by co-heritability was highest (99.04%) between seed length and width and least (4.32%) between seed width and WT. Positive and significant (P < 0.05) phenotypic and or genotypic correlation existed between seed width and thickness, among the three seed character ratios and between seed length with all the seed character ratios except WT. The correlation between seed width and the three seed character ratios were not significant. The negative correlation between seed thickness with LT and WT were not significant too. There were very reliable and highly significant linear relationships between the seed traits except for seed length and thickness. Therefore, breeding concentration on any of these traits may proportionately reflect on the others.


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1 - International Institute of Tropical Agriculture,, Genebank Unit, P m b 5320, Oyo Road, Ibadan, Oyo State, 234, Nigeria
2 - University of Agriculture,Abeokuta, Department of Plant Breeding and Seed Technology, P m b 2240, Alabata Road, Abeokuta, Ogun State, 234, Nigeria
3 - University of Agriculture,Abeokuta, Department of Biological Sciences, P m b 2240, Alabata Road, Abeokuta, Ogun State, 234, Nigeria

Keywords:
African yam bean
seed traits
heritability
co-heritability.

Presentation Type: Oral Paper:Papers for Topics
Session: 32
Location: 214/216/SUB
Date: Tuesday, July 29th, 2008
Time: 9:15 AM
Number: 32006
Abstract ID:500


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