Ewa Zimnoch-Guzowska

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Solanum ×  michoacanum (Bitter.) Rydb. is a diploid, 1 EBN (Endosperm Balance Number) nothospecies, a relative of potato originating from the area of Morelia in Michoacán State of Mexico that is believed to be a natural hybrid of S. bulbocastanum × S. pinnatisectum. Both parental species and S. michoacanum have been described as sources of resistance to(More)
Resistance to Potato virus Y (PVY) is one of the most important traits in seed and ware potato production. Currently the tobacco-necrosis inducing PVYN strain including PVYN-Wi and PVYNTN dominates in the PVY population in Poland. The PVYO strain which dominated in early 1980s is rarely detected. Since early 1950s, breeding for PVY resistance in IHAR was a(More)
Phytophthora infestans (Mont.) de Bary, the causal organism of late blight, is economically the most important pathogen of potato and resistance against it has been one of the primary goals of potato breeding. Some potentially durable, broad-spectrum resistance genes against this disease have been described recently. However, to obtain durable resistance in(More)
In total, 154 accessions of wild potato species from VIR’s potato collection were screened at IHAR-PIB Młochów Research Center (Poland) for resistance to Phytophthora infestans and, a part of them, for resistance to Potato Virus X (PVX) and Potato Virus Y (PVY). High levels of leaf resistance to P. infestans were found in the accessions of Central American(More)
In this study, genotype by environment (G × E) interaction and biological stability of resistance to Phytophthora infestans were analyzed for 22 potato cultivars, using multidimensional statistical methods. Sergen 3 computer program, based on multiplicative model was applied to analyze the G × E interaction and regression analysis. The potato cultivars were(More)
Most QTL for leaf sucrose content map to positions that are similar to positions of QTL for tuber starch content in diploid potato. In the present study, using a diploid potato mapping population and Diversity Array Technology (DArT) markers, we identified twelve quantitative trait loci (QTL) for tuber starch content on seven potato chromosomes: I, II, III,(More)
Potato cultivar Bzura bred in 1986 is one of the few European cultivars outstanding in high level of durable resistance to late blight, but its resistance has not been characterized. The presented study was aimed at clarifying bases of durable resistance in Bzura by testing its resistance and resistance in progeny individuals. In ten-year field experiment(More)
Using DArT analysis, we demonstrated that all Solanum × michoacanum (+) S. tuberosum somatic hybrids contained all parental chromosomes. However, from 13.9 to 29.6 % of the markers from both parents were lost in the hybrids. Somatic hybrids are an interesting material for research of nucleus-cytoplasm interaction and sources of new nuclear and cytoplasmic(More)
Late blight is a devastating and worldwide potato and tomato disease caused by Phytophthora infestans (Mont.) de Bary. The aim of the study was to compare P. infestans isolates collected from potato and tomato plants by determining their virulence, aggressiveness, and sporulation intensity on both hosts in reciprocal testing with the goal of elucidating(More)
Two previously sequenced tobacco rattle virus (TRV) isolates, Slu24 and Deb57, from Polish potato fields have recombinant RNA2 species. The 3’-proximal region of the Slu24 RNA2 is derived from the 3’ terminus of its supporting RNA1, while that of the Deb57 RNA2 is derived from the 3’ terminus of the unrelated RNA1 from the isolate SYM or PpK20. Gene(More)