Sensitivity of 7 sugar beet collection materials to Cercospora beticola Sacc. was investigated in a laboratory test in vitro. For comparison 7 sugar beet varieties from different breeding (Balladyna, Janosik, Marcepan, Nevenka, Picasso, Schubert, Tunika) were included to this experiment. A tolerant variety Georgina was used as control. 2 populations of beets with reduced sensitivity to C. beticola (187800 and 187795) and 1 variety of sugar beet (Nevenka) were found in this investigation. No resistant beets were noticed. The results were compared with the symptoms of disease in a field test. Some of these genotypes can be used in research and breeding programs.
The aim of presented studies was to determine the response of 35 Avena sterilis L. accessions to the exogenous gibberellic acid supply. A. sterilis genotypes come from genebanks in Beltsville (USA), Saskatoon (Canada), Gatersleben (Germany) and Radzikow (Poland). Based on conducted analysis it could be found that Avena sterilis genotypes are very diversified in regard to the GA₃ reaction. The majority of analysed genotypes was susceptible to GA₃. AVE 2116, AVE 2122, AVE 2561, CN 25717 and PI 378832 were insensitive on GA₃. The shortest plant height among the insensitive genotypes were CN 25717 and PI 378832 accessions.