title: [Semisterile meiotic mutant sy11 with heterologous chromosome synapsis in rye Secale cereale L].
abstract: A study was made of the expression and inheritance of the sy11 mutation, which alters homologous chromosome synapsis in meiotic prophase I of rye. The abnormal phenotype proved to be determined by a recessive allele of a single sy11 gene. Univalents and multivalents were observed in homozygotes for the mutant allele. Analysis of the synaptonemal complex revealed a combination of homologous and nonhomologous synapsis in the mutant. The nonhomologous synapsis frequency significantly decreased in the course of meiotic prophase I in the mutant. The number of chiasmata per bivalent in metaphase I was 1.1 x 0.01 versus 1.8 x 0.01 in wild-type plants, and the number of univalents was 2.7 x 0.06 versus 0.5 x 0.05 in wild-type plants. As a result, a broad range of abnormalities was observed at subsequent stages of meiosis and led to the formation of defective microspores. Mutant plants were semisterile.
authors: S V
authors: SV
authors: Golubtsov
authors: S P
authors: SP
authors: Sosnikhina
authors: I V
authors: IV
authors: Iordanskaia
authors: A V
authors: AV
authors: Voĭlokov
authors: E I
authors: EI
authors: Mikhaĭlova
authors: O L
authors: OL
authors: Kolomiets
authors: Iu F
authors: IuF
authors: Bogdanov
mesh_terms: D023902:Chromosome Pairing / Q000235:genetics*; D032461:Chromosomes, Plant / Q000235:genetics*; D008540:Meiosis / Q000235:genetics*; D009154:Mutation; D051479:Plant Infertility / Q000235:genetics*; D012434:Secale / Q000235:genetics*