IDENTIFICATION OF TROPICAL BLACK BEAN BREEDING LINES RESISTANT TO BGYMV USING MOLECULAR MARKERS

INTRODUCTION: The incidence of diseases significantly reduces seed yield in the tropical environments of common bean production areas in southern Mexico, which includes the states of Veracruz and Chiapas. Yield losses up to 100% have been reported when plant infection by BGYMV occurs at the seedling stage (López et al., 2002a). Moreover, it has been known since the early 90´s that BGYMV reduces dry bean yield in tropical Mexico, and the state of Chiapas is not the exception since yield loses have been reported to reach 18.2 to 40.5% for commercial cultivars Negro Tacaná and Negro Huasteco-81, respectively (López et al., 1993); while in the northern areas of the state of Veracruz the reduction could get up to 87.6% for cultivar Negro Jamapa (Rodríguez and Yoshii, 1990). The objective of this study was to identify Mesoamerican black common bean germplasm with resistance to BGYMV by artificial inoculation and verification by the presence of molecular markers associated with virus resistance