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Identification of the potato chromosomes 1 (the longest one), 2 (the carrier of the nucleolar organizer, NOR) and 12 (the shortest one) is possible at mitosis using a combined Feulgen-haematoxylin staining or a Giemsa C-banding technique. In two aneuploids containing 27 chromosomes, three specimens of chromosome 1 were found through conventional staining. Variation of the length of the NORs and the size of the satellite of homologues or homoeologues of chromosome 2 was observed in various cytotypes. Pachytene analysis identified trisomics of chromosome 2 of interspecific origin, involving S. tuberosum L. ssp. tuberosum Hawkes and S. phureja Juz. et Buk., but only two specimens of chromosome 2 could be identified using the Giemsa C-banding technique. However, in six different interspecific chromosome 2-trisomics, three chromosomes per cell were found to show a hybridization signal by non-radioactive in situ hybridization with heterologous rDNA from pea. The high polymorphism of chromosomes observed after Giemsa C-banding made it impossible to bring the identity of the mitotic chromosomes in accordance with the results from pachytene identification in cells containing one triplicate chromosome.

Chromosome Identification in Potato Trisomics(2n=2x+1=25) by Conventional Staining, Giemsa C-banding and Non-radioactive in situ Hybridization.