[Mapping of meiotic genes in rye (Secale cereale L.): localization of sy19 mutation, impairing homologous synapsis, by means of isozyme and microsatellite markers].

The sy19 mutation, which impairs the homology of meiotic chromosome synapsis in rye, were mapped using a specially created F2 population by means of isozyme Acph 1 locus and microsatellite (SSR) markers. The sy19gene was localized in the chromosome 7R in the pericentromeric region of long armbased on the linked inheritance with the Acph 1 locus. The locus was linked with five rye SSR markers, with the Xrems 1234 locus being located closest to the sy19 gene (6.

[Mapping of meiotic genes in rye (Secale cereale L.): localization of sy18 mutation with impaired homologous synapsis using microsatellite markers].

The recessive spontaneous sy18 mutation with nonhomologous synapsis was mapped in rye. The sy18 gene was located in the centromeric region of chromosome 2R in relation to three rye SSR (simple sequence repeats) loci, i.e.

[Molecular genetic mapping of the sy1 and sy9 asynaptic genes in rye (Secale cereale L.) using microsatellite and isozyme markers].

Studies of phenotypical expression of synaptic mutations in combination with the localization of corresponding genes on a genetic map permit individual stages of the meiotic process to be differentiated. Two rye asynaptic genes, sy1 and sy9, were mapped with the use of microsatellite markers (SSR) in the pericentromeric regions of the long chromosome arms 7R and 2R, respectively. The sy9 gene cosegregated with two SSR markers Xscm43 and Xgwm132.

[Identification of leaf rust resistance genes in wheat (Triticum aestivum L.) cultivars using molecular markers].

A collection of 68 cultivars of common wheat has been screened for leaf rust resistance genes with the use of molecular markers. Markers of genes Lr1, Lr9, Lr10, Lr19, Lr20, Lr21, Lr24, and Lr26 have been used. It has been suggested that allele Xgwm295 be used as a marker for identifying the Lr34 gene.

[Modulation of the cat gene expression in E. coli cells by simple (AC)20 repeats].

Probable relationship between modulation of gene expression by simple repeating sequences and competition capacity of the host was studied. (AC)20 repeat can both stimulate and inhibit the expression of chloramphenicol acetyl transferase gene expression in E. coli cells depending on this gene's position.