A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis.
Plagiospora gracilis, a mucilaginous crustose red alga growing on subtidal pebbles on both coasts of the North Atlantic Ocean, forms distinctive tetrasporangia (red algal meiotic structures that release haploid tetraspores) but gametophytes have never been reported. In the absence of gametangia, the...
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ftunivbournem:oai:eprints.bournemouth.ac.uk:23752 2023-06-11T04:14:45+02:00 A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. Maggs, Christine Saunders, G.W. 2016-07-01 application/pdf http://eprints.bournemouth.ac.uk/23752/ https://eprints.bournemouth.ac.uk/23752/1/final%20submitted%20ms.%20Plagiospora.pdf en eng https://eprints.bournemouth.ac.uk/23752/1/final%20submitted%20ms.%20Plagiospora.pdf Maggs, C. and Saunders, G.W., 2016. A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. Botanical Journal of the Linnean Society, 182 (1), 1-13. cc_by_nc_nd_4 Article PeerReviewed 2016 ftunivbournem 2023-05-28T05:41:32Z Plagiospora gracilis, a mucilaginous crustose red alga growing on subtidal pebbles on both coasts of the North Atlantic Ocean, forms distinctive tetrasporangia (red algal meiotic structures that release haploid tetraspores) but gametophytes have never been reported. In the absence of gametangia, the taxonomic position of this monotypic genus has always been uncertain; it is currently placed provisionally in the Gloiosiphoniaceae (Gigartinales) by comparison with sporophytes of Gloiosiphonia obtained in culture. Dioecious gametophytic crusts of P. gracilis are now reported for the first time, forming gametangia in inconspicuous superficial sori. There is no evidence that fertilization ever occurs in the field although fertile males and female were collected together. In culture, tetraspores grew into tetrasporophytes for three successive generations, by presumed apomictic sporophyte recycling. The life history of P. gracilis may represent a late stage in the loss of sexual reproduction leading to tetraspore-to-tetrasporophyte life histories such as that in Hildenbrandia. Phylogenetic analysis of sequences of the rbcL, LSU (28S) rDNA and coxI (COI-5P) genes for P. gracilis with other Gigartinales resolved P. gracilis as a distinct lineage in a well-supported clade of the families Sphaerococcaceae, Gloiosiphoniaceae, Endocladiaceae, Nizymeniaceae and Phacelocarpaceae. We here propose the monotypic Plagiosporaceae fam. nov. to accommodate P. gracilis. Article in Journal/Newspaper North Atlantic Bournemouth University Research Online (BURO) |
institution |
Open Polar |
collection |
Bournemouth University Research Online (BURO) |
op_collection_id |
ftunivbournem |
language |
English |
description |
Plagiospora gracilis, a mucilaginous crustose red alga growing on subtidal pebbles on both coasts of the North Atlantic Ocean, forms distinctive tetrasporangia (red algal meiotic structures that release haploid tetraspores) but gametophytes have never been reported. In the absence of gametangia, the taxonomic position of this monotypic genus has always been uncertain; it is currently placed provisionally in the Gloiosiphoniaceae (Gigartinales) by comparison with sporophytes of Gloiosiphonia obtained in culture. Dioecious gametophytic crusts of P. gracilis are now reported for the first time, forming gametangia in inconspicuous superficial sori. There is no evidence that fertilization ever occurs in the field although fertile males and female were collected together. In culture, tetraspores grew into tetrasporophytes for three successive generations, by presumed apomictic sporophyte recycling. The life history of P. gracilis may represent a late stage in the loss of sexual reproduction leading to tetraspore-to-tetrasporophyte life histories such as that in Hildenbrandia. Phylogenetic analysis of sequences of the rbcL, LSU (28S) rDNA and coxI (COI-5P) genes for P. gracilis with other Gigartinales resolved P. gracilis as a distinct lineage in a well-supported clade of the families Sphaerococcaceae, Gloiosiphoniaceae, Endocladiaceae, Nizymeniaceae and Phacelocarpaceae. We here propose the monotypic Plagiosporaceae fam. nov. to accommodate P. gracilis. |
format |
Article in Journal/Newspaper |
author |
Maggs, Christine Saunders, G.W. |
spellingShingle |
Maggs, Christine Saunders, G.W. A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
author_facet |
Maggs, Christine Saunders, G.W. |
author_sort |
Maggs, Christine |
title |
A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
title_short |
A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
title_full |
A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
title_fullStr |
A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
title_full_unstemmed |
A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. |
title_sort |
new monotypic family for the enigmatic crustose red alga plagiospora gracilis. |
publishDate |
2016 |
url |
http://eprints.bournemouth.ac.uk/23752/ https://eprints.bournemouth.ac.uk/23752/1/final%20submitted%20ms.%20Plagiospora.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://eprints.bournemouth.ac.uk/23752/1/final%20submitted%20ms.%20Plagiospora.pdf Maggs, C. and Saunders, G.W., 2016. A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis. Botanical Journal of the Linnean Society, 182 (1), 1-13. |
op_rights |
cc_by_nc_nd_4 |
_version_ |
1768371015078903808 |