title: Ac-like transposons in populations of wild diploid Triticeae species: comparative analysis of chromosomal distribution.
abstract: Data are presented on the intra- and interspecific differences/similarities in chromosomal patterns of Ac-like elements (hAT family) in ecologically contrasted populations of three Triticeae species - Aegilops speltoides, Triticum urartu, and Hordeum spontaneum. Application of original computer software made it possible to precisely map transposon clusters and to link them to known chromosomal markers (rDNA sites, centromeres, and heterochromatin regions). From our data we can specify the most visible features of Ac-like elements chromosomal distribution: preferential concentration in chromosomal proximal regions; high percentage of clusters on the border between euchromatin and heterochromatin; complementary chromosomal arrangement towards En/Spm transposons (CACTA); population-specific insertions into centromeres; more differences in total cluster numbers between populations of self-pollinated species than between populations of cross-pollinated species. The application of statistical simulation (Resampling) method to analysis of data indicates that ecology may play a certain role in dynamics of Ac-like elements. Comparison of real Ayala distances, as well as real chromosomal distribution of Ac-like elements in populations of two species with different mating systems with the same but randomly simulated parameters, revealed that non-random population structure in the Mediterranean floral zone suffers and becomes chaotic in the Irano-Turanian zone.
authors.affiliation: Institute of Evolution, University of Haifa, Mt Carmel, Haifa, 31905, Israel.
authors.forename: Ahu
authors.initials: A
authors.lastname: Altinkut
authors.forename: Violetta
authors.initials: V
authors.lastname: Kotseruba
authors.forename: Valery M
authors.initials: VM
authors.lastname: Kirzhner
authors.forename: Eviatar
authors.initials: E
authors.lastname: Nevo
authors.forename: Olga
authors.initials: O
authors.lastname: Raskina
authors.forename: Alexander
authors.initials: A
authors.lastname: Belyayev
mesh_terms: D001483:Base Sequence; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D018744:DNA, Plant; D004171:Diploidy; D002523:Edible Grain / Q000145:classification / Q000235:genetics*; D005828:Genetics, Population; D018745:Genome, Plant; D017403:In Situ Hybridization; D018749:RNA, Plant / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics; D012341:RNA, Ribosomal, 5S / Q000235:genetics; D018626:Retroelements; D013045:Species Specificity
chemical_list: D018744:DNA, Plant; D018749:RNA, Plant; D012335:RNA, Ribosomal; D012341:RNA, Ribosomal, 5S; C088179:RNA, ribosomal, 45S; D018626:Retroelements