Genetic variability of Phaseolus vulgaris L. cultivars from Peru : a contribution to the bean core collection
1994
Valderrama, A. | Iwanaga, Masaru | Sanchez, I. | Tohme M, Joseph
The genetic variability of 382 landraces of Phaseolus vulgaris L. from the different regions of Peru was evaluated using phaseolin and nine isozyme loci systems detected from leaves and roots. Correspondence and cluster analysis identified two genetically divergent groups. One, with phaseolin and isozyme systems characteristics of the Andean genepool, and the other mainly from the province of Junin, with biochemical patterns of the Mesoamerican genepool. Also, accessions with electrophoretic patterns typical of recombinant between the two divergent groups were found. The introduction and adaptation of germplasm from Mesoamerica to the Andean region, with a subsequent gene flow could have produced such recombinant genotypes. Studies using both nuclear and cytoplasm markers are underway to clarify the origin, evolution, potential of inter genepool recombinants and its implications for germplasm collection and conservation. Hundred accessions were also part of the common bean core collection. Data of these 100 accessions were compared with those of the total 382 accessions and it was found that 95.7 percent of the alleles were preserved in the core collection, and that only one allele and some heterozygotes of low frequency were excluded.
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