SOURCES OF RESISTANCE TO Colletotrichum lindemuthianum IN TRADITIONAL CULTIVARS OF COMMON BEAN FROM PARANA, BRAZIL

摘要

Anthracnose caused by Colletotrichum lindemuthianum (Sacc. & Magnus) Lams.-Scrib. is one of the most severe and widespread disease of common beans (Phaseolus vulgaris, L.). Given the wide variability of the pathogen and the potential for new virulentraces to arise, the use of the genetically resistant cultivars is an effective way to control this disease (Kelly et al., 1994). The genetic resistance of the host to C. Indemuthianum is not durable, and the plant breeding programs demand a continuous work and require in a permanent and enlarging form of gene pools, in which new genes can be introduced in new cultivars or in cultivars already existent as a way to increase resistance (Pastor-Corrales et al., 1995; Young and Kelly, 1996). Parana State isthe main Brazilian bean producing State and is an area where highly variable traditional populations of beans can be found (Alberini, 2001). Evaluation of genetic resistance of landrace beans from Parana to Andean and Mesoamerican races of C. lindemuthianum is needed prior to incorporation in new common bean cultivars as possible sources of resistance to anthracnose. The objective of this study was to characterize 26 landrace bean cultivars from Parana State, for their reaction to a wide range C. lindemuthianum races present in the state.