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Effect of Macrophomina phaseolina (Tassi) Goid. on Grain Yield of Common Beans (Phaseolus vulgaris L.) and its Relationship with Yield Stability Parameters
Netzahualcóyotl Mayek Pérez, Cándido López Castañeda, Ernesto López Salinas, Javier Cumpián Gutiérrez, Ignacio Candelario Joaquín Torres, José Saúl Padilla Ramírez, Jorge Alberto Acosta Gallegos;
Revista Mexicana de Fitopatología 2003 21(2)
Inglés Español
The reaction of common bean germplasm to charcoal rot under field conditions in Mexico was evaluated to determine the relationship between the susceptibility index and yield stability parameters, and to suggest an alternative strategy for evaluation and selection of resistant germplasm. Sixty-four genotypes with contrasting reactions to Macrophomina phaseolina were sown in Isla, Cotaxtla, and Iguala, Mexico in five experiments on naturally and artificially infested soils. The lowest seed yield and the highest charcoal rot intensity index were obtained in Iguala in 1998, and Cotaxtla in 1997-1998, where artificial soil inoculations reduced seed yield more than 60% compared to naturally infested soils. Charcoal rot susceptibility index was significantly associated to seed yield (-0.47*) particularly at vegetative stage, whereas charcoal rot severity was not. Resistant germplasm with high seed yield belonged to Mesoamerican race, while susceptibility was associated mainly to Jalisco and Durango races. The association between reaction to charcoal rot and yield stability under field conditions was unclear, since only 35% of germplasm preclassified as resistant under greenhouse conditions showed yield stability, while 60 and 45% of germplasm pre-classified as intermediate or susceptible exhibited yield stability, respectively. Results indicate that charcoal rot susceptibility index based on seed yield could be useful as a fast, non destructive and reliable screening strategy of resistant germplasm under field conditions.

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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018