Reduction of the lenght of 1 RS.1BL translocation in the bread wheat variety "Yugoslavia"

This study was conducted to estimate the survival of 1RS.1BL wheat-rye translocations in a bread wheat (Triticum aestivum L. em Thell.) variety "Yugoslavia" including "Aurora" as a donor of translocation in its pedigree. The cultivar was cytologically checked by N-banding for the presence of 1RS.1BL translocation. Fluorescence in situ hybridization using total genomic biotin labelled rye DNA as a probe was used for identification and localisation of the translocation breakpoints and their size. At metaphase and interphase the introgressed rye segment was observed and photographed. Digital image analysing system with cooled CCD camera was used for overlapping the pictures of the probe signals and counterstained wheat chromosomes and helped to determine the position and extent breakpoint of this translocation. The translocation in this variety is probably restricted to the NOR region only, unlike in other 1RS.BL translocation lines ("Kavkaz") where the translocation carries at least the major part of the 1RS arm.