INFLUENCE OF PLANT AGE ON RESISTANCE OF DRY BEANS TO ANTHRACNOSE
Abstract
Disease resistance, at seedling stage, has been widely used in breeding programs because it is easier to recognize and select. However, the adult-plant resistance (APR) can be used to increase the durability of resistance. An experiment was carried with the cultivars Rio Negro, Rio Tibagi, Diamante Negro, Pérola, Xamego and Aporé, with the objective of identifying APR. Six successive planting dates of these cultivars were madc at seven-day intervals and inoculation with four pathotypes of Colletotrichum lindemuthianum. APR was observed in the cultivars Rio Negro and Rio Tibagi. However, a seedling resistance interferente in the latter was observed. Although the susceptible cultivars Diamante Negro and Pérola showed reduction in symptoms intensity with increase of age, they did not achieve the resistance level of 'Rio Negro' and 'Rio Tibagi'. The cultivars Aporé and Xamego showed seedling resistance to alI four isolates of the pathogen tested.
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