title: [Autosegregation of enzyme loci in agamospermous progenies of triploid plants of sugar beet (Beta vulgaris L.)].
abstract: The ratios of the phenotypic classes of glucosephosphate isomerase (GP12) and malate dehydrogenase (MDH1 and MDH2) were studied in agamospermous progenies of triploid sugar beet plants. The ratio of the phenotypic classes of these enzymes corresponds to the calculations based on the assumption of polyteny of chromosomes carrying alleles of the enzyme loci accompanied by the loss of extra copies of the alleles in the first division of a cell entering embryogenesis. An increase in the gene dosage due to polyteny leads to the appearance in the progeny with a definite frequency of alleles that were absent in the original parental plant. The notions of meiotic autosegregation and mitotic autosegregation characteristic of meiotic and mitotic agamospermy are introduced, as well as the term locus polygenotype characterizing not only the allelic composition and the number of chromosomes, but also the number of chromatids carrying alleles of the marker locus in the cell before its entry into embryogenesis.
authors.forename: E V
authors.initials: EV
authors.lastname: Levites
authors.forename: S S
authors.initials: SS
authors.lastname: Kirikovich
mesh_terms: D000483:Alleles; D027461:Beta vulgaris / Q000201:enzymology / Q000235:genetics*; D032461:Chromosomes, Plant / Q000235:genetics / Q000378:metabolism; D056426:Genetic Loci / Q000502:physiology*; D005956:Glucose-6-Phosphate Isomerase / Q000235:genetics* / Q000378:metabolism; D008291:Malate Dehydrogenase / Q000235:genetics* / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D011123:Polyploidy
chemical_list: D010940:Plant Proteins; D008291:Malate Dehydrogenase; D005956:Glucose-6-Phosphate Isomerase