Resistência da soja à ferrugem-asiática avaliada pela análise da produtividade de gr？os

the main objectives of this work were to study the soybean resistance and/or tolerance to asian rust and to select the inbred lines more productive in relation to asian rust. data from six experiments involving the parental lines and their f2, f3 and f4 generations were used in this experiment. it was carried out in londrina, parana state, during the 2005/06, 2006/07 and 2007/08 cropping seasons. a completely randomized experiment with individual plants sown in hill plot was used (01 hill plot = 01 plant). soybean resistance and/or tolerance to asian rust is controlled by major and minor genes expressing mainly additive effects dispersed in the parents. it is possible to select inbred lines superior to the best yielding parent from most crosses. the narrow sense heritability for the yield trait under rust pressure ranged from average to high (0.324 to 0.815) at the f3 progeny level, which warrants gains from selection.