In the interphase nuclei of VT-5 plants there were large and dis-tinct sectors of green-labeled S. tuberosum chromatin visible. AfterGISH with genomic DNA of S. villosum to VT-4 hybrid metaphaseplate, the majority of the chromosomes showed hybridization sig-nals, although a group of chromosomes without signals was alsoobserved. In the metaphase plate (in prophase) of the analyzedVT-4 plant there were large and distinct sectors of pink-labeledS. villosum chromatin visible. Both euploid (VT-5) and aneuploid(VT-4) were somatic hybrids, possessing genomes from two fusionparents