Imagen de Portada

Molecular and Phenotypic Diversity of Common Bean Landraces from Nicaragua

Guardado en:
Publicado en:Crop Science vol. 44, no. 4 (Jul/Aug 2004), p. 1412-1418
Autor principal: Gómez, Oscar J
Otros Autores: Blair, Matthew W, Frankow-Lindberg, Bodil E, Gullberg, Urban
Publicado:
American Society of Agronomy
Materias:
Nicaragua
Genetic diversity
Genotype & phenotype
Beans
Conservation
Molecular biology
Crop science
Genetic structure
Genetic resources
Environmental
Acceso en línea:Citation/Abstract
Full Text + Graphics
Full Text - PDF
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
Resumen:The knowledge and understanding of the genetic structure of bean (Phaseolus vulgaris L.) landraces is important for the implementation of measures addressed to their management and conservation. The purpose of this paper was to study the pattern of genetic variation in nine red-seeded landraces currently grown by farmers with molecular and phenotypic markers. Twelve individuals per landrace were genotyped with seven bean microsatellite markers. Fourteen phenotypic traits were additionally measured in a field study in two localities. An important finding of this study was the complementary information obtained with both kinds of markers. Most of the variation at the molecular level was explained by differences within or among landraces but not among agroecological zones, while at the phenotypic level most of the variation was attributed to differences among agroecological zones. This suggests that molecular differentiation of landraces [coancestry coefficient (F^sub ST^) = 0.34] was due to founder effect while phenotypic differentiation was due to the effect of adaptation. Within landraces, an average of 5.7 alleles per locus was identified, with a range from 2 to 13 alleles depending on the individual microsatellite. The average gene diversity within landraces and total gene diversity was 0.35 and 0.51, respectively. Implications of the findings in planning future collections of genetic resources of common bean as well as the effect of sites on uncovering adaptive traits are also discussed. [PUBLICATION ABSTRACT]
ISSN:0011-183X
1435-0653
Fuente:Science Database