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-4) , 55-633. Jakubowski, T., Pytlowski, T. (2015). Influence of UV-C radiation on the degree of infection of stored potato tubers by Rhizoctonia Solani Kühn. Agricultural Engineering , 154(2), 35-43. Kita, A, Aniołkowski, K., Włodarczyk, E. (2003). Zmiany frakcji tłuszczowej w przechowywanych produktach przekąskowych. Zeszyty Naukowe Akademii Rolniczej we Wrocławiu , 35(2), 88-89. Kita, A. (2006). Wpływ wybranych parametrów technologicznych na jakość smażonych produktów przekąskowych. Zeszyty Naukowe Akademii Rolniczej we Wrocławiu, 537, Rozprawy 240. Krokida, M

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play a role? Journal of Food Composition and Analysis, 27: 32-37. EC No. 1881/2006. Commision Regulation (EC) No 1881/2006 of 19 December 2006 setting maximum levels for certain contaminants in foodstuffs. URL: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:364:0005:0024:EN :PDF (accessed 24/02/2015). FAN J., ZIADI N., BÉLANGER G., PARENT L.E., CAMBOURIS A., HU Z., 2009. Cadmium accumulation in potato tubers produced in Quebec. Canadian Journal of Soil Science, 89: 435-443. FC SR. Foodstuffs Codex of Slovak Republic, URL: http:// www

Abstract

Potato breeding clones were evaluated for resistance to late blight (agent Phytophthora infestans) using tuber inoculation tests and for presence of the resistance alleles of R1 and R3a genes in polymerase chain reaction tests. Among clones tested those expressing high, moderate and low resistance were identified. The data were analysed for the impact of R1 and R3a genes on tuber resistance to late blight in tested plant material. In previous evaluations performed on smaller amount of clones the tuber resistance levels significantly depended on presence/absence of the resistance allele of R3a gene and did not depend on presence of R1 gene allele. In the current study the statistical analyses did not prove the significant difference in resistance levels depending on presence of the resistance alleles, neither of R1 gene, nor of R3a gene. Tuber resistant clones bearing R3a gene resistance alleles still noticeably prevailed over the clones bearing the alleles of R1 gene as well as over the clones bearing the no resistance alleles of both genes. In several cases the resistance of clones with detected resistance allele of R1 gene was higher compared to those derived from the same crosses and showing amplification of the allele of R3a gene or those with no resistance alleles. Clones accumulating the resistance alleles of both (R1 and R3a) genes expressed high tuber resistance accompanied by necrotic reaction.