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B Chromosomes of Aegilops speltoides Are Enriched in Organelle Genome-Derived Sequences

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 w...

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Detalles Bibliográficos
Autores principales: Ruban, Alevtina, Fuchs, Jörg, Marques, André, Schubert, Veit, Soloviev, Alexander, Raskina, Olga, Badaeva, Ekaterina, Houben, Andreas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3936023/
https://www.ncbi.nlm.nih.gov/pubmed/24587288
http://dx.doi.org/10.1371/journal.pone.0090214
Descripción
Sumario: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.