Novel Brassica hybrids with different resistance to reveal unbalanced rDNA signal patterns.

Hybridization of with various Brassicaceae species can result in obtaining new forms with increased resistance to blackleg, a dangerous disease caused mainly by . In this study, we aimed to correlate the field resistance of selected hybrids to blackleg with chromosomal structure revealed by Fluorescence hybridization. Tested genotypes varied in the number of chromosomes and rDNA signals. The greatest variation was observed for A1-type chromosomes. Field evaluation also revealed significant differences in resistance. Performed analyses allowed to distinguish three × genotypes in which variable patterns of chromosomal structure might be connected to field resistance. However, a more thorough study, including the detection of all A-genome chromosomes, is required.