Herencia de la Resistencia de Campo a Macrophomina phaseolina (Tassi) Goid. en Líneas Endogámicas Recombinantes de Frijol Común (Phaseolus vulgaris L.)

common bean (phaseolus vulgaris) genotypes bat 477, resistant to the fungus macrophomina phaseolina, and pinto ui-114 (susceptible), were manually crossed in chapingo, mexico, and then advanced by self-fertilization to the f8 generation. the 137 f8 recombinant inbred lines, the two parents and five checks (seq 12, pinto zapata, negro altiplano, azufrado tapatío, pinto villa) were evaluated during 2004-2005 in cotaxtla and isla, veracruz, mexico, using lattice 12 x 12 experimental designs with four replications under natural fungal infection. two replications were conducted under irrigation and the other two under rainfed conditions (irrigation was suspended at flowering initiation). results indicated that field resistance to m. phaseolina in bat 477 in cotaxtla and isla, is controlled by two and nine genes, respectively. when recombinant inbred line reactions were classified in two classes (resistant, susceptible), field resistance in cotaxtla was controlled by two dominant genes with double recessive epistasis.