Different Behavior ofBrassica junceaandB. carinataas Sources ofPhoma lingamResistance in Experiments of Interspecific Transfer toB. napus

摘要

AbstractWith the aim to transferPhoma lingamresistance into rape, successful interspecific crosses were made between three oilseed rape varieties (Brassica napus) and the resistant speciesB. carinataandB. carinata.Although both hybrid typesB. napus×B. junceaandB. napus×B. carinatashowed the same high level of resistance as the respective resistant parent, the resistance could be only transferred fromjunceacrosses. After three backcross generations, lines morphologically undistinguishable from rape, fertile, and with a high degree of resistance were obtained. The resistance ofB. carinatawas practically lost in the first backcross. A possible explanation of this different behavior could be a higher recombination between the genomes B and C (junceacrosses) than between B and A (carinatacrosses). The: applied embryo culture increased the yield of hybrids and first backcross plants and reduced considerably the generation tim