| Role of endoreduplication and apomeiosis during parthenogenetic reproduction in the model brown alga Ectocarpus. | |
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MedLine Citation:
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PMID: 20618911 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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• The filamentous brown alga Ectocarpus has a complex life cycle, involving alternation between independent and morphologically distinct sporophyte and gametophyte generations. In addition to this basic haploid-diploid life cycle, gametes can germinate parthenogenetically to produce parthenosporophytes. This article addresses the question of how parthenosporophytes, which are derived from a haploid progenitor cell, are able to produce meiospores in unilocular sporangia, a process that normally involves a reductive meiotic division. • We used flow cytometry, multiphoton imaging, culture studies and a bioinformatics survey of the recently sequenced Ectocarpus genome to describe its life cycle under laboratory conditions and the nuclear DNA changes which accompany key developmental transitions. • Endoreduplication occurs during the first cell cycle in about one-third of parthenosporophytes. The production of meiospores by these diploid parthenosporophytes involves a meiotic division similar to that observed in zygote-derived sporophytes. By contrast, meiospore production in parthenosporophytes that fail to endoreduplicate occurs via a nonreductive apomeiotic event. • Our results highlight Ectocarpus's reproductive and developmental plasticity and are consistent with previous work showing that its life cycle transitions are controlled by genetic mechanisms and are independent of ploidy. |
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Authors:
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John H Bothwell; Dominique Marie; Akira F Peters; J Mark Cock; Susana M Coelho |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-02 |
Journal Detail:
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Title: The New phytologist Volume: 188 ISSN: 1469-8137 ISO Abbreviation: New Phytol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-15 Completed Date: 2011-01-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882884 Medline TA: New Phytol Country: England |
Other Details:
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Languages: eng Pagination: 111-21 Citation Subset: IM |
Affiliation:
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Queen's University Belfast, School of Biological Sciences, 97 Lisburn Road, Belfast, BT9 7BL, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Cell Nucleus
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metabolism DNA / metabolism Evolution, Molecular Gene Duplication* Geography Germ Cells, Plant / cytology, metabolism Meiosis / genetics* Models, Biological* Parthenogenesis / genetics* Phaeophyta / cytology*, genetics* Ploidies Poisson Distribution Reproduction / genetics |
| Chemical | |
Reg. No./Substance:
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9007-49-2/DNA |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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