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Abstract Detail

Genetics Section

Cortés, Andrés [1], Chavarro, Carolina [2], Madriñán, Santiago [1], Blair, Matthew [2].

Allele diversity at candidate genes for drought tolerance in wild common bean (Phaseolus vulgaris).

We present an allele diversity study conducted on 104 wild common beans evaluating seven candidate genes for drought tolerance. The objective of this research was to screen for alleles of relevant drought genes. An analysis of linkage disequilibrium between these selected genes was compared with patterns of neutral markers. With these data we assessed the genepool structure and selection history of the species. We started this project by identifying orthologous genes based on phylogenetic and genealogical relationships between different crop species. Our principal results suggest a strong relationship between DREB2A and population structure in common bean, and significant associations of DREB2B and ERECTA genes with estimated habitat drought stress for the wild accessions. The relevance of introgression, genetic drift, ancestral variation and low genetic polymorphism was analyzed in reference to the remaining genes. Finally, this investigation has shown that wild common bean is a reservoir of unusual and important genetic and adaptive variation.

Broader Impacts:

1 - Universidad de los Andes, Departamento de Ciencias Biológicas, Laboratorio de Botánica y Sistemática, Apartado Aéreo 4976, Bogotá, DC, Colombia
2 - Centro Internacional de Agricultura Tropical - CIAT, Laboratorio de Caracterización de Germoplasma de Fríjol, Km 10 recta Cali-Palmira, Palmira, Valle del Cauca, Colombia

Keywords:
Phaseolus vulgaris
Drought tolerance
ERECTA
DREB
ASR
SUSY
SNPs
population structure
Association Analysis
Agroecology.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM
Number: PGN001
Abstract ID:119