Agricultura técnica en México
versão impressa ISSN 0568-2517
RODRIGUEZ-GUERRA, Raúl; ACOSTA-GALLEGOS, Jorge Alberto; GONZALEZ-CHAVIRA, Mario Martín e SIMPSON, June. Pathotypes of Colletotrichum lindemuthianum and their implications for the development of resistant bean cultivars. Agric. Téc. Méx [online]. 2006, vol.32, n.1, pp. 101-114. ISSN 0568-2517.
Colletotrichum lindemuthianum, the causal agent of bean anthracnose causes substantial losses in the production of this legume around the world. The main strategy for the control of this pathogen is the use of resistant cultivars. The great variety of pathotypes shown by C. lindemuthianum hampers the wider utilization of resistant cultivars developed for specific regions and resistant to specific local C. lindemuthianum pathotypes already characterized. Therefore, the success of breeding programs requires the identification of the pathotypes that are present in the regions for which resistant cultivars will be developed and to use sources of resistance genes against the prevalent pathotypes. The objectives of this essay are: i) Make known the frequency and distribution of the C. lindemuthianum pathotypes identified in Mexico to date, ii) Point out possible sources of resistance within the set of differential cultivars used for pathotype identification of the fungus, which could be used in breeding programs in common bean, iii) Postulate the resistance genes carried by bean cultivars previously characterized on the basis of their reaction to pathotypes of the fungus. This information offers researchers and bean breeders the opportunity to select sources of resistance to the pathogen and the possibility of accumulating resistance genes in improved cultivars of commercial value for different regions of Mexico. An example could be the incorporation of the resistance genes from the differentials Kaboon (Co-12) and Tu (Co-5) into improved cultivars or the combination of genes from elite cultivars such as Negro INIFAP (postulated to carry the genes Co-12 or Co13) and Negro 8025 (postulated to carry the genes Co-6 or Co-8) in the generation of black seeded cultivars resistant to the majority of C. linde muthianum pathotypes found in the country.
Palavras-chave : Phaseolus vulgaris; anthracnose; genetic improvement; sources of resistance.