O. N. Tikhodeev

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Recessive mutations only occurring in two genes (ribosomal suppressors sup1 and sup2) can be obtained using special selective system. We demonstrate that the absolute selectivity of the system is based on selection for simultaneous reversions to prototrophy in mutants requiring adenine and histidine in haploids marked by two different nonsense(More)
Special search for frameshift mutations, which are suppressed by the cytoplasmic [PSI] factor and by omnipotent nonsense suppressors (recessive mutations in the SUP35 and SUP45 genes), partially inactivating a translation termination complex, was initiated in the LYS2 gene in the yeast Saccharomyces cerevisiae. Mutations were obtained after exposure to UV(More)
Special search for frameshift mutations, which are suppressed by the cytoplasmic [PSI] factor and by omnipotent nonsense suppressors (recessive mutations in theSUP35and SUP45genes), partially inactivating a translation termination complex, was initiated in theLYS2gene in the yeast Saccharomyces cerevisiae.Mutations were obtained after exposure to UV light(More)
The present paper is devoted to the evolutionary role of genetic modules shuffing. The mechanisms capable to produce new molecular functions and significant complications of ontogenesis are reviewed. Two-step model of macroevolution is proposed. This model comprises: (1) Arising of a new combination of genetic modules. This step does not result in formation(More)
Flower variability was studied in natural populations of European starflower (Trientalis europaeaL.). The results showed that the flower structure in this species is determined by two parameters: the multiplicity of primordia of flower components and the uniformity of flower meristem development. The frequencies of nonuniformly developing flowers differs(More)
Blueberries are an increasingly important h~ticultural crop in New Zealand and other coun~es. Fruit ripen over an extended period, with considerable differences in storage and other qualities. Tissue concentrations of abscisic acid (ABA), 1-aminocyciopmpane-l-carboxylic acid (ACC), malonyl-ACC and also ACC oxidase activity and ethylene evolution were(More)
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