Integration of Physical, Genetic, and Cytogenetic Mapping Data for Cellulose Synthase () Genes in Flax ( L.).

Flax, L., is a valuable multi-purpose plant, and currently, its genome is being extensively investigated. Nevertheless, mapping of genes in flax genome is still remaining a challenging task.

[The Use of Specific DNA Markers for the Identification of Alleles of the FAD3 Genes in Rape (Brassica napus L.)].

A search was conducted for the alleles responsible for the quality of food-grade rapeseed oil in a collection of 21 samples of spring and winter oilseed rape of Belarusian and Russian breeding. We also developed A- and C-gene-specific DNA markers to assess the genomic polymorphisms of rape for FAD3 genes and selected plants with a low content of linolenic acid for use in the selection process. The development of a method for identifying FAD3 alleles, which control the level of linolenic acid in rapeseed oil, as well as of the design for new dCAPS markers, enabled the identification of plants homozygous for individual FAD3A and/or FAD3C genes in the F2-generation.

Intraspecific chromosomal and genetic polymorphism in Brassica napus L. detected by cytogenetic and molecular markers.

The application of DNA intercalator 9-aminoacridine allowed us to increase the resolution of chromosome C-banding and DAPI-banding patterns and to investigate chromosomal polymorphism in karyotypes of seven spring and six winter rape varieties. It was shown that the pericentromeric and intercalary C-bands of most of the chromosomes in spring rape were smaller in size and less polymorphic than those of winter rape. More 26S and 5S rDNA sites were found in the winter rape karyotypes than the spring varieties.