title: B chromosomes of Aegilops speltoides are enriched in organelle genome-derived sequences.
abstract: B chromosomes (Bs) are dispensable components of the genome exhibiting non-Mendelian inheritance. Chromosome counts and flow cytometric analysis of the grass species Aegilops speltoides revealed a tissue-type specific distribution of the roughly 570 Mbp large B chromosomes. To address the question whether organelle-to-nucleus DNA transfer is a mechanism that drives the evolution of Bs, in situ hybridization was performed with labelled organellar DNA. The observed B-specific accumulation of chloroplast- and mitochondria-derived sequences suggests a reduced selection against the insertion of organellar DNA in supernumerary chromosomes. The distribution of B-localised organellar-derived sequences and other sequences differs between genotypes of different geographical origins.
authors.affiliation: Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Department of Genetics and Biotechnology, Moscow, Russia ; Leibniz-Institute of Plant Genetics and Crop Plant Research (IPK), Chromosome Structure and Function Laboratory, Gatersleben, Germany.
authors.forename: Alevtina
authors.initials: A
authors.lastname: Ruban
authors.affiliation: Leibniz-Institute of Plant Genetics and Crop Plant Research (IPK), Chromosome Structure and Function Laboratory, Gatersleben, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Fuchs
authors.affiliation: Laboratory of Plant Cytogenetics and Evolution, Department of Botany, Universidade Federal de Pernambuco, Recife, Brazil.
authors.forename: André
authors.initials: A
authors.lastname: Marques
authors.affiliation: Leibniz-Institute of Plant Genetics and Crop Plant Research (IPK), Chromosome Structure and Function Laboratory, Gatersleben, Germany.
authors.forename: Veit
authors.initials: V
authors.lastname: Schubert
authors.affiliation: Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Department of Genetics and Biotechnology, Moscow, Russia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Soloviev
authors.affiliation: Institute of Evolution, University of Haifa, Laboratory of Plant Molecular Cytogenetics, Haifa, Israel.
authors.forename: Olga
authors.initials: O
authors.lastname: Raskina
authors.affiliation: Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Laboratory of Molecular Karyology, Moscow, Russia.
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Badaeva
authors.affiliation: Leibniz-Institute of Plant Genetics and Crop Plant Research (IPK), Chromosome Structure and Function Laboratory, Gatersleben, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Houben
mesh_terms: D032461:Chromosomes, Plant / Q000235:genetics*; D018744:DNA, Plant / Q000235:genetics*; D018745:Genome, Plant / Q000235:genetics*; D009928:Organ Specificity; D015388:Organelles / Q000235:genetics*; D006109:Poaceae / Q000235:genetics*; D011110:Polymorphism, Genetic; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D018744:DNA, Plant