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Inheritance of Anthracnose Resistance in the Common Bean Differential Cultivar G 2333 and Identification of a New Molecular Marker Linked to the Co‐4 2 gene

2001; Wiley; Volume: 149; Issue: 5 Linguagem: Inglês

10.1046/j.1439-0434.2001.00612.x

1439-0434

Alzate‐Marin, Menarim, Gilson S. Baía, JR Paula, Krystyano Almeida de Souza, Da Costa, Everaldo Gonçalves de Barros, Moreira,

Plant Pathogens and Fungal Diseases

The inheritance of anthracnose resistance of the common bean ( Phaseolus vulgaris L.) differential cultivar G 2333 to Colletotrichum lindemuthianum races 73 and 89 was studied in crosses with the susceptible cultivar Rudá. The segregation ratios of 15 : 1 in the F 2 and 3 : 1 in the backcrosses to Rudá indicate that for each of the races tested there are two independent resistance loci in G 2333. A random amplified polymorphic DNA (RAPD) molecular marker (OPH18 1200C ) linked in resistance to race 73 was identified in a BC 3 F 2:3 population derived from crosses between Rudá and G 2333. A RAPD molecular marker OPAS13 950C , previously identified as linked to gene Co‐4 2 , was also amplified in this population. Co‐segregation analyses showed that these two markers are located at 5.6 (OPH18 1200C ) and 11.2 (OPAS13 950C ) cM of the Co‐4 2 gene. These markers were not present in BC 1 F 2:3 plants resistant to race 89 indicating that this population carries a different resistance gene. DNA amplification of BC 1 F 2:3 plants with RAPD molecular marker OPAB 450C , previously identified as linked to gene Co‐5 , indicated that this gene is present in this population.