title: The diversity of karyotypes and genomes within section Syllinum of the Genus Linum (Linaceae) revealed by molecular cytogenetic markers and RAPD analysis.
abstract: The wide variation in chromosome number found in species of the genus Linum (2n = 16, 18, 20, 26, 28, 30, 32, 36, 42, 72, 84) indicates that chromosomal mutations have played an important role in the speciation of this taxon. To contribute to a better understanding of the genetic diversity and species relationships in this genus, comparative studies of karyotypes and genomes of species within section Syllinum Griseb. (2n = 26, 28) were carried out. Elongated with 9-aminoacridine chromosomes of 10 species of section Syllinum were investigated by C- and DAPI/С-banding, CMA and Ag-NOR-staining, FISH with probes of rDNA and of telomere repeats. RAPD analysis was also performed. All the chromosome pairs in karyotypes of the studied species were identified. Chromosome DAPI/C-banding patterns of 28-chromosomal species were highly similar. Two of the species differed from the others in chromosomal location of rDNA sites. B chromosomes were revealed in all the 28-chromosomal species. Chromosomes of Linum nodiflorum L. (2n = 26) and the 28-chromosomal species were similar in DAPI/C-banding pattern and localization of several rDNA sites, but they differed in chromosomal size and number. The karyotype of L. nodiflorum was characterized by an intercalary site of telomere repeat, one additional 26S rDNA site and also by the absence of B chromosomes. Structural similarities between different chromosome pairs in karyotypes of the studied species were found indicating their tetraploid origin. RAPD analysis did not distinguish the species except L. nodiflorum. The species of section Syllinum probably originated from a common tetraploid ancestor. The 28-chromosomal species were closely related, but L. nodiflorum diverged significantly from the rest of the species probably due to chromosomal rearrangements occurring during evolution.
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Nadezhda L
authors.initials: NL
authors.lastname: Bolsheva
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Zelenin
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Inna V
authors.initials: IV
authors.lastname: Nosova
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Alexandra V
authors.initials: AV
authors.lastname: Amosova
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Tatiana E
authors.initials: TE
authors.lastname: Samatadze
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Olga Yu
authors.initials: OY
authors.lastname: Yurkevich
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Nataliya V
authors.initials: NV
authors.lastname: Melnikova
authors.affiliation: Russian Federal Research Institute for Fisheries and Oceanography, Moscow, Russia.
authors.forename: Daria A
authors.initials: DA
authors.lastname: Zelenina
authors.affiliation: Russian Federal Research Institute for Fisheries and Oceanography, Moscow, Russia.
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Volkov
authors.affiliation: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Olga V
authors.initials: OV
authors.lastname: Muravenko
mesh_terms: D002871:Chromosome Banding; D032461:Chromosomes, Plant / Q000737:chemistry / Q000648:ultrastructure*; D004275:DNA, Ribosomal / Q000235:genetics; D019597:Flax / Q000145:classification / Q000235:genetics*; D018740:Genetic Heterogeneity; D005819:Genetic Markers; D059646:Genome Size; D018745:Genome, Plant; D017404:In Situ Hybridization, Fluorescence; D059785:Karyotype; D007621:Karyotyping; D010802:Phylogeny; D019105:Random Amplified Polymorphic DNA Technique; D013194:Staining and Labeling; D016615:Telomere / Q000737:chemistry / Q000648:ultrastructure*; D057891:Tetraploidy
chemical_list: D004275:DNA, Ribosomal; D005819:Genetic Markers
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