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Título

Linkage between a Xanthomonas campestris pv. phaseoli resistance SCAR marker and flower and seed color in common bean

Autor Duncan, R. W.; Lema Márquez, Margarita; Singh, S. P.; Gilbertson, R. L.
Fecha de publicación jul-2007
EditorAmerican Phytopathological Society
Citación Phytopathology 97: S30 (2007)
ResumenThe bacterium Xanthomonas campestris pv. phaseoli causes common bacterial blight (CBB), an important seed-transmitted disease of common bean (Phaseolus vulgaris L.). Resistant cultivars are the best method for managing this disease. Molecular markers associated with resistance introgressed from tepary bean have proven useful for indirect selection of CBB resistance in common bean. The objective of this study was to determine the relationship among flower and seed color, and CBB resistance. A cross was made involving one parent with an intermediate level of CBB resistance, white flower, and light red seed color; and another with a high level of CBB resistance, purple flower, and dark red seed color. The two parents, F1 and F2, were assessed for CBB resistance, flower and seed color, and the presence/absence of the SCAR marker BC420 linked with CBB resistance. The F1 was uniform with all plants resistant to CBB, having lilac flower color, the BC420 marker, and the less desirable dark red seed color. In the F2 (119 plants), no recombination between flower and seed color and the BC420 CBB resistance marker was found. This tight undesirable linkage between a molecular marker linked with a major-effect QTL imparting resistance to CBB, purple/lilac flower, and dark red seed color presents an immense challenge for CBB resistance breeding.
Descripción Comunicación presentada en 2007 Joint Meeting of The American Phytopathological Society & Society of Nematologists "Strength through diversity". Celebrado en San Diego, California (USA) entre los días 28 de julio y 1 de agosto de 2007.
Versión del editorhttp://apsjournals.apsnet.org/toc/phyto/97/7s
URI http://hdl.handle.net/10261/102880
ISSN0031-949X
Aparece en las colecciones: (MBG) Comunicaciones congresos
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