Местоположение издательства:Moscow, Russia (Federation)
Первая страница:19
Последняя страница:25
Аннотация:After two-step mutagenesis with nitrosomethyl urea the resistant to dimethomorph (DMM) mutants of Phytophthora infestans were obtained. The frequencies of mutations were low – 6,27 x 10-7 in their first step-mutagenesis and 6,4 x 10-8 – in the second. Lethal concentrations of DMM were increased from 2 mg/l to 8 mg/l. Fitness of mutants in vitro and in planta was low. Most of F1 hybrids between resistant to DMM and sensitive strains were phenotypic similar to sensitive parent. The rare resistant hybrid strains have decreasing fitness, teratic low-germinated sporangia, and were instable (on media without DMM they reverted to sensitivity and normal growth). The anomalous segregation in the F1 hyrids was analysed regarding to mating type inheritance, linkage between mating type and dimR loci, and death of resistant hybrids.
