Abstract
Phylogenetic relationship and polymorphism was detected in 10 cowpea lines comprising of leaf, flower and stem mutants, their putative parents and an exotic accession using 10 random amplified polymorphic DNAs (RAPDs) and three primer combinations of amplified fragment length polymorphism (AFLP) markers. These mutants were earlier obtained through the probable activities of transposable elements. The RAPD and AFLP markers revealed a genetic diversity of 47 and 31%, respectively, within the cowpea lines used. Genetic distance ranged from 0.05 to 0.30 based on AFLP markers, while it ranged between 0.13 and 0.44 for RAPD markers. Cluster analysis indicated that there are differences in RAPD markers between the various mutants and it grouped an exotic genotype separately. OPC-14 primer had the highest discriminatory capacity (11 polymorphic fragments). The AFLP analysis was able to group two of the flower mutants, leaf mutants and wild types separately. A combined analysis of the two markers gave a similar grouping as was obtained from the AFLP analysis. AFLP was more discriminatory in grouping the plant samples and the exotic line was distinguished based on both markers. Useful heterotic prediction can be done based on the genetic distance between the mutants and their parents. This will further broaden the genetic base of cowpea and enhance the use of these mutants which have some evolutionary significance. In addition, unique allele RAPD_OPC15-500bp can be harnessed in genetic identification of reduced petal mutant. This study further corroborates the discriminatory power of AFLP over RAPDs. Key words: Vigna unguiculata, amplified fragment length polymorphism (AFLP), randomly amplified polymorphic DNA (RAPD), mutants, transposable elements.
Highlights
Genetic diversity studies are usually done to assess the variation and the similarity within plant species
DNA fingerprints were obtained for all the mutants and their parents using both random amplified polymorphic DNAs (RAPDs) and amplified fragment length polymorphism (AFLP) markers
Three mini groups were obtained from the use of the RAPD markers, while the exotic line Tvu 94051 and Reduced petal mutant 2 (RPM2) were grouped separately
Summary
Genetic diversity studies are usually done to assess the variation and the similarity within plant species. Source University of Ibadan , Ibadan Nigeria IITA IITA IITA University of Ibadan , Ibadan Nigeria University of Ibadan , Ibadan Nigeria University of Ibadan , Ibadan Nigeria University of Ibadan , Ibadan Nigeria University of Ibadan , Ibadan Nigeria University of California Davis, Davis CA USA the progenies from crosses made by previous workers on cowpea. These mutants, with genetic evidence used in this study, have shown to be under the influence of transposable elements. This study was done in order to further enhance this in cowpea
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