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To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina

Fungi have a large potential for flexibility in their mode of sexual reproduction, resulting in mating systems ranging from haploid selfing to outcrossing. However, we know little about which mating strategies are used in nature, and why, even in well‐studied model organisms. Here, we explored the f...

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Autores principales: Martinossi‐Allibert, Ivain, Ament‐Velásquez, Sandra Lorena, Saupe, Sven J., Johannesson, Hanna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10092876/
https://www.ncbi.nlm.nih.gov/pubmed/36263943
http://dx.doi.org/10.1111/jeb.14108
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author Martinossi‐Allibert, Ivain
Ament‐Velásquez, Sandra Lorena
Saupe, Sven J.
Johannesson, Hanna
author_facet Martinossi‐Allibert, Ivain
Ament‐Velásquez, Sandra Lorena
Saupe, Sven J.
Johannesson, Hanna
author_sort Martinossi‐Allibert, Ivain
collection PubMed
description Fungi have a large potential for flexibility in their mode of sexual reproduction, resulting in mating systems ranging from haploid selfing to outcrossing. However, we know little about which mating strategies are used in nature, and why, even in well‐studied model organisms. Here, we explored the fitness consequences of alternative mating strategies in the ascomycete fungus Podospora anserina. We measured and compared fitness proxies of nine genotypes in either diploid selfing or outcrossing events, over two generations, and with or without environmental stress. We showed that fitness was consistently lower in outcrossing events, irrespective of the environment. The cost of outcrossing was partly attributed to non‐self recognition genes with pleiotropic effects on fertility. We then predicted that when presented with options to either self or outcross, individuals would perform mate choice in favour of the reproductive strategy that yields higher fitness. Contrary to our prediction, individuals did not seem to avoid outcrossing when a choice was offered, in spite of the fitness cost incurred. Our results suggest that, although functionally diploid, P. anserina does not benefit from outcrossing in most cases. We outline different explanations for the apparent lack of mate choice in face of high fitness costs associated with outcrossing, including a new perspective on the pleiotropic effect of non‐self recognition genes.
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spelling pubmed-100928762023-04-13 To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina Martinossi‐Allibert, Ivain Ament‐Velásquez, Sandra Lorena Saupe, Sven J. Johannesson, Hanna J Evol Biol Research Articles Fungi have a large potential for flexibility in their mode of sexual reproduction, resulting in mating systems ranging from haploid selfing to outcrossing. However, we know little about which mating strategies are used in nature, and why, even in well‐studied model organisms. Here, we explored the fitness consequences of alternative mating strategies in the ascomycete fungus Podospora anserina. We measured and compared fitness proxies of nine genotypes in either diploid selfing or outcrossing events, over two generations, and with or without environmental stress. We showed that fitness was consistently lower in outcrossing events, irrespective of the environment. The cost of outcrossing was partly attributed to non‐self recognition genes with pleiotropic effects on fertility. We then predicted that when presented with options to either self or outcross, individuals would perform mate choice in favour of the reproductive strategy that yields higher fitness. Contrary to our prediction, individuals did not seem to avoid outcrossing when a choice was offered, in spite of the fitness cost incurred. Our results suggest that, although functionally diploid, P. anserina does not benefit from outcrossing in most cases. We outline different explanations for the apparent lack of mate choice in face of high fitness costs associated with outcrossing, including a new perspective on the pleiotropic effect of non‐self recognition genes. John Wiley and Sons Inc. 2022-10-20 2023-01 /pmc/articles/PMC10092876/ /pubmed/36263943 http://dx.doi.org/10.1111/jeb.14108 Text en © 2022 The Authors. Journal of Evolutionary Biology published by John Wiley & Sons Ltd on behalf of European Society for Evolutionary Biology. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Martinossi‐Allibert, Ivain
Ament‐Velásquez, Sandra Lorena
Saupe, Sven J.
Johannesson, Hanna
To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title_full To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title_fullStr To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title_full_unstemmed To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title_short To self or not to self? Absence of mate choice despite costly outcrossing in the fungus Podospora anserina
title_sort to self or not to self? absence of mate choice despite costly outcrossing in the fungus podospora anserina
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10092876/
https://www.ncbi.nlm.nih.gov/pubmed/36263943
http://dx.doi.org/10.1111/jeb.14108
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