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Nat Commun. 2014 Oct 8;5:5070. doi: 10.1038/ncomms6070.

Chiasmatic and achiasmatic inverted meiosis of plants with holocentric chromosomes.

Author information

1
1] Department of Botany, Laboratory of Plant Cytogenetics and Evolution, Federal University of Pernambuco, Rua Nelson Chaves s/n, Recife, Pernambuco 50670-420, Brazil [2] Department of Chromosome Biology, Max F. Perutz Laboratories, University of Vienna, Dr Bohr-Gasse 9, Vienna A-1030, Austria.
2
Department of Botany, Laboratory of Plant Cytogenetics and Evolution, Federal University of Pernambuco, Rua Nelson Chaves s/n, Recife, Pernambuco 50670-420, Brazil.
3
Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstraße 3, Gatersleben 06466, Germany.
4
Department of Chromosome Biology, Max F. Perutz Laboratories, University of Vienna, Dr Bohr-Gasse 9, Vienna A-1030, Austria.

Abstract

Meiosis is a specialized cell division in sexually reproducing organisms before gamete formation. Following DNA replication, the canonical sequence in species with monocentric chromosomes is characterized by reductional segregation of homologous chromosomes during the first and equational segregation of sister chromatids during the second meiotic division. Species with holocentric chromosomes employ specific adaptations to ensure regular disjunction during meiosis. Here we present the analysis of two closely related plant species with holocentric chromosomes that display an inversion of the canonical meiotic sequence, with the equational division preceding the reductional. In-depth analysis of the meiotic divisions of Rhynchospora pubera and R. tenuis reveals that during meiosis I sister chromatids are bi-oriented, display amphitelic attachment to the spindle and are subsequently separated. During prophase II, chromatids are connected by thin chromatin threads that appear instrumental for the regular disjunction of homologous non-sister chromatids in meiosis II.

PMID:
25295686
PMCID:
PMC4190664
DOI:
10.1038/ncomms6070
[Indexed for MEDLINE]
Free PMC Article

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