Abstract
The genetic resistance of Phaseolus vulgaris L. cultivar Michelite to races 8 and 64 of Colletotrichum lindemuthianum, causal agent of bean anthracnose, was characterized. Crosses were made between Michelite and Mexico 222 cultivars and the F2 population was inoculated with race 64 in order to study the inheritance of resistance to anthracnose in Michelite. The segregation of F2 population fitted in a ratio of 3R:1S, showing the presence of a dominant gene in Michelite gene conditioning resistance to race 64. Allelism tests were conducted with F2 populations derived from crosses between Michelite and AB 136, AND 277, BAT 93, Cornell 49-242, G 2333, Kaboon, Mexico 222, Michigan Dark Red Kidney (MRDK), Ouro Negro, Perry Marrow, PI 207262, TO, TU, and Widusa. All the cultivars (except Mexico 222) were resistant to race 64. While F2 derived from the Michelite x Mexico 222 was inoculated with race 8. Additionally, allelism tests indicated that the gene present in Michelite is independent from Co-1, Co-2, Co-3, Co-4, Co-5, Co-6, Co-7, Co-9 and Co-10 genes. The monogenic inheritance observed in Michelite and the independence of this gene from those previously characterized allow the authors to propose that the anthracnose resistant gene in Michelite should be named Co-11.
Highlights
The common bean (Phaseolus vulgaris L.) is one of the most important components of the Brazilian diet as it is a proven source of protein and a good source of carbohydrates and iron
The inheritance study showed that segregation in the F2 offspring from a cross between Michelite (R) x Mexico 222 (S) produced a F2 ratio of 3R:1S (p = 0.70), demonstrating that resistance to C. lindemuthianum race 64 in the Michelite cultivar is conferred by a dominant gene (Table 1)
This indicates the presence of two independent dominant genes conferring resistance to C. lindemuthianum, one of gene coming from the Michelite cultivar female parent and the other from the male parent
Summary
The common bean (Phaseolus vulgaris L.) is one of the most important components of the Brazilian diet as it is a proven source of protein and a good source of carbohydrates and iron. The yield of P. vulgaris can be affected by climatic conditions which can cause outbreaks of a large number of pests and diseases (Vieira, 1988). The anthracnose caused by Colletotrichum lindemuthianum is one of the most widespread and economically important fungal diseases of common bean (Phaseolus vulgaris L.), mainly occurring when plants are grown under high relative humidity and temperatures of between 13 °C and 26 °C. These climatic conditions favor infection by C. lindemuthianum which can cause losses in yield as high as 100% and, in less severe instances, lowering product quality by damaging the.
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