B chromosomes of Aegilops speltoides are enriched in organelle genome-derived sequences.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 24587288.
- Also identified by DOI 10.1371/journal.pone.0090214 and PMC identifier 3936023.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
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.
Medical subject headings
- Chromosomes, Plant
- DNA, Plant
- Genome, Plant
- Organelles
- Poaceae
- Sequence Analysis, DNA