[Determination of the composition and the allelic state of disease and pest resistance genes in potato parental lines using DNA markers].

The allelic dosage of disease and pest resistance genes was determined in 11 prospective potato varieties and hybrids by means of detecting the corresponding PCR DNA markers in their progeny from crosses with specially selected testers. It was revealed that most (65%) resistance genes in the analyzed parental lines were present as a single dominant allele (simplex). Nevertheless, we were able to find some multiplex lines valuable for breeding.

Assessment of the possibility of direct crossing between cultivated potato and two wild allotetraploid relatives.

The cultivated potato Solanum tuberosum L. is an autotetraploid with Endosperm Balance Number (EBN) of 4. There are some allotetraploid 2EBN wild species with desirable traits for potato improvement.