Evolution of genetic diversity during the domestication of common-bean (Phaseolus vulgaris L.)

M13 DNA fingerprinting was used to determine evolutionary changes that occurred in Latin American germ plasm and USA cultivars of commonbean (Phaseolus vulgaris L.) during domestication. Linkage mapping experiments showed that M13-related sequences in the common-bean genome were either located at th...

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Bibliographic Details
Published in:Theoretical and applied genetics 1994-11, Vol.89 (5), p.629-635
Main Authors: Sonnante, G, Stockton, T, Nodari, R.O, Becerra Velasquez, V.L, Gepts, P. (California Univ., Davis (USA). Dept. of Agronomy and Range Science)
Format: Article
Language:English
Subjects:
Biological and medical sciences
CARTE GENETIQUE
Classical genetics, quantitative genetics, hybrids
Crop evolution
DOMESTICACION
DOMESTICATION
EVOLUCION
EVOLUTION
Fingerprinting
Fundamental and applied biological sciences. Psychology
Gartenbau
GENETICA MOLECULAR
Genetics of eukaryotes. Biological and molecular evolution
GENETIQUE MOLECULAIRE
IDENTIFICACION
IDENTIFICATION
Linkage map
M13
MAPAS GENETICOS
Pflanzenzuechtung
PHASEOLUS VULGARIS
Pteridophyta, spermatophyta
VARIACION GENETICA
VARIATION GENETIQUE
Vegetals
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Summary:M13 DNA fingerprinting was used to determine evolutionary changes that occurred in Latin American germ plasm and USA cultivars of commonbean (Phaseolus vulgaris L.) during domestication. Linkage mapping experiments showed that M13-related sequences in the common-bean genome were either located at the distal ends of linkage groups or that they were unlinked to each other or to any previously mapped markers. Levels of polymorphism observed by hybridization with M13 (1 probe-enzyme combination) were comparable to those observed by hybridization with single-copy random Pst1 genomic probes (36 enzyme-probe combinations) but were higher than those observed for isozymes (10 loci). Results indicated that the wild ancestor had diverged into two taxa, one distributed in Middle America (Mexico, Central America, and Colombia) and the other in the Andes (Peru and Argentina); they also suggested separate domestications in the two areas leading to two cultivated gene pools. Domestication in both areas led to pronounced reductions in diversity in cultivated descendants in Middle America and the Andes. The marked lack of polymorphism within commercial classes of USA cultivars suggests that the dispersal of cultivars from the centers of origin and subsequent breeding of improved cultivars led to high levels of genetic uniformity. To the present knowledge, this is the first crop for which this reduction in diversity has been documented with a single type of marker in lineages that span the evolution between wild ancestor and advanced cultivars.
ISSN:0040-5752
1432-2242
DOI:10.1007/bf00222458