Results indicated that field resistance to M. Two replications were conducted under irrigation and the other two under rainfed conditions (irrigation was suspended at flowering initiation). 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≢005 in Cotaxtla and Isla, Veracruz, Mexico, using lattice 12 x 12 experimental designs with four replications under natural fungal infection. phaseolina.Ĭommon bean (Phaseolus vulgaris) genotypes BAT 477, resistant to the fungus Macrophomina phaseolina, and Pinto UI≡14 (susceptible), were manually crossed in Chapingo, Mexico, and then advanced by selffertilization to the F8 generation. (1998) identified in recombinant endogamic lines derived from the cross x Dorado (susceptible), a variable number of loci of quantitative characters associated with resistance, which explained 12 to 19% of the phenotypic variation observed for the reaction to M. phaseolina is polygenic, while Miklas et al. Miklas and Beaver (1994) detemined that field resistance to M. phaseolina is governed by a pair of dominant genes with complementary effects in the greenhouse and in the greenhouse and field, respectively. (2001a) reported that resistance of line BAT 477 to M. BAT 477 pertenece a la raza genética Mesoamérica, tiene grano pequeño color beige y es una línea mejorada originaria de Colombia con hábito de crecimiento tipo III mientras que Pinto UI-114 pertenece a la resistance, which are difficult to undertake because of the traditional inoculation procedures used, and to the adverse effects of some environmental factors which mask plant response to the pathogen (Mayek-Pérez et al., 1997 Olaya et al., 1996). (1998) identificaron en líneas endogámicas recombinantes derivadas de la cruza x Dorado (susceptible), un número variable de loci de caracteres cuantitativos (LCCs) asociados con la resistencia a la pudrición carbonosa en campo, los cuales a su vez explicaron del 12 al 19% de la variación fenotípica observada para la reacción a M. phaseolina es de naturaleza poligénica, mientras que Miklas et al. Miklas y Beaver (1994) deteminaron que la resistencia de campo a M. phaseolina en la línea BAT 477 es gobernada por un par de genes dominantes con efectos complementarios, en condiciones de evaluación de invernadero y de invernadero y campo, respectivamente. (2001a) indicaron que la resistencia a M. phaseolina (Mayek-Pérez et al., 1996, 2001bPastor-Corrales y Abawi, 1988) se han identificado genotipos resistentes de frijol a la pudrición carbonosa sin embargo, se desconoce la base genética de la resistencia al hongo en variedades y líneas experimentales promisorias como fuentes de resistencia genética a la enfermedad. En estudios previos de la reacción de germoplasma de Phaseolus a M. phaseolina, and that resistance is controlled by two complementary dominant genes (double recessive epistasis), akin to the exhibited by TLP 19, the other resistant genotype. It was confirmed that BAT 477 is resistant to M. This was suggested by data in F 2 populations that showed normal-like distributions in some cases, and in F 3 it was adjusted to normal distributions on their frequency of reaction to charcoal rot suggesting resistance segregations determined by two epistatic genes with variable effects, depending on the genotype used as parent. phaseolina in common bean is controlled by two pairs of epistatic genes with complementary effects, and that resistance to charcoal rot could be quantitatively controlled by major effects of two genes. phaseolina was evaluated under greenhouse conditions. Reaction of F 3 lines to a highly virulent isolate of M. Parents, F 1 and F 2 generations and F 1 -parent backcrosses were included in the studies. Experiments were conducted under field conditions at Cotaxtla, Veracruz and in greenhouse at Montecillo, Estado de México. on resistant (BAT 477 and TLP 19) and susceptible (Pinto UI-114 and Rio Tibagi) common bean cultivars were carried out. Studies to determine genetic resistance inheritance to M.
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