Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta)
Abstract Meiosis and syngamy generate an alternation between two ploidy stages, but the timing of these two processes varies widely across taxa, thereby generating life cycle diversity. One hypothesis suggests that life cycles with long‐lived haploid stages are correlated with selfing, asexual repro...
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Online Access: | http://dx.doi.org/10.1111/jpy.13339 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.13339 |
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crwiley:10.1111/jpy.13339 2024-09-15T17:48:41+00:00 Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) Heiser, Sabrina Amsler, Charles D. Stoeckel, Solenn McClintock, James B. Baker, Bill J. Krueger‐Hadfield, Stacy A. National Science Foundation Phycological Society of America University of Alabama at Birmingham 2023 http://dx.doi.org/10.1111/jpy.13339 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.13339 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ Journal of Phycology volume 59, issue 4, page 681-697 ISSN 0022-3646 1529-8817 journal-article 2023 crwiley https://doi.org/10.1111/jpy.13339 2024-07-11T04:36:45Z Abstract Meiosis and syngamy generate an alternation between two ploidy stages, but the timing of these two processes varies widely across taxa, thereby generating life cycle diversity. One hypothesis suggests that life cycles with long‐lived haploid stages are correlated with selfing, asexual reproduction, or both. Though mostly studied in angiosperms, selfing and asexual reproduction are often associated with marginal habitats. Yet, in haploid‐diploid macroalgae, these two reproductive modes have subtle but unique consequences whereby predictions from angiosperms may not apply. Along the western Antarctic Peninsula, there is a thriving macroalgal community, providing an opportunity to explore reproductive system variation in haploid‐diploid macroalgae at high latitudes where endemism is common. Plocamium sp. is a widespread and abundant red macroalga observed within this ecosystem. We sampled 12 sites during the 2017 and 2018 field seasons and used 10 microsatellite loci to describe the reproductive system. Overall genotypic richness and evenness were high, suggesting sexual reproduction. Eight sites were dominated by tetrasporophytes, but there was strong heterozygote deficiency, suggesting intergametophytic selfing. We observed slight differences in the prevailing reproductive mode among sites, possibly due to local conditions (e.g., disturbance) that may contribute to site‐specific variation. It remains to be determined whether high levels of selfing are characteristic of macroalgae more generally at high latitudes, due to the haploid‐diploid life cycle, or both. Further investigations of algal life cycles will likely reveal the processes underlying the maintenance of sexual reproduction more broadly across eukaryotes, but more studies of natural populations are required. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Wiley Online Library Journal of Phycology 59 4 681 697 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Meiosis and syngamy generate an alternation between two ploidy stages, but the timing of these two processes varies widely across taxa, thereby generating life cycle diversity. One hypothesis suggests that life cycles with long‐lived haploid stages are correlated with selfing, asexual reproduction, or both. Though mostly studied in angiosperms, selfing and asexual reproduction are often associated with marginal habitats. Yet, in haploid‐diploid macroalgae, these two reproductive modes have subtle but unique consequences whereby predictions from angiosperms may not apply. Along the western Antarctic Peninsula, there is a thriving macroalgal community, providing an opportunity to explore reproductive system variation in haploid‐diploid macroalgae at high latitudes where endemism is common. Plocamium sp. is a widespread and abundant red macroalga observed within this ecosystem. We sampled 12 sites during the 2017 and 2018 field seasons and used 10 microsatellite loci to describe the reproductive system. Overall genotypic richness and evenness were high, suggesting sexual reproduction. Eight sites were dominated by tetrasporophytes, but there was strong heterozygote deficiency, suggesting intergametophytic selfing. We observed slight differences in the prevailing reproductive mode among sites, possibly due to local conditions (e.g., disturbance) that may contribute to site‐specific variation. It remains to be determined whether high levels of selfing are characteristic of macroalgae more generally at high latitudes, due to the haploid‐diploid life cycle, or both. Further investigations of algal life cycles will likely reveal the processes underlying the maintenance of sexual reproduction more broadly across eukaryotes, but more studies of natural populations are required. |
author2 |
National Science Foundation Phycological Society of America University of Alabama at Birmingham |
format |
Article in Journal/Newspaper |
author |
Heiser, Sabrina Amsler, Charles D. Stoeckel, Solenn McClintock, James B. Baker, Bill J. Krueger‐Hadfield, Stacy A. |
spellingShingle |
Heiser, Sabrina Amsler, Charles D. Stoeckel, Solenn McClintock, James B. Baker, Bill J. Krueger‐Hadfield, Stacy A. Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
author_facet |
Heiser, Sabrina Amsler, Charles D. Stoeckel, Solenn McClintock, James B. Baker, Bill J. Krueger‐Hadfield, Stacy A. |
author_sort |
Heiser, Sabrina |
title |
Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
title_short |
Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
title_full |
Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
title_fullStr |
Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
title_full_unstemmed |
Tetrasporophytic bias coupled with heterozygote deficiency in Antarctic Plocamium sp. (Florideophyceae, Rhodophyta) |
title_sort |
tetrasporophytic bias coupled with heterozygote deficiency in antarctic plocamium sp. (florideophyceae, rhodophyta) |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/jpy.13339 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.13339 |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Journal of Phycology volume 59, issue 4, page 681-697 ISSN 0022-3646 1529-8817 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/jpy.13339 |
container_title |
Journal of Phycology |
container_volume |
59 |
container_issue |
4 |
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681 |
op_container_end_page |
697 |
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1810290181944639488 |