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Emergence of a floral colour polymorphism by pollinator-mediated overdominance
Maintenance of polymorphism by overdominance (heterozygote advantage) is a fundamental concept in evolutionary biology. In most examples known in nature, overdominance is a result of homozygotes suffering from deleterious effects. Here we show that overdominance maintains a non-deleterious polymorph...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6325131/ https://www.ncbi.nlm.nih.gov/pubmed/30622247 http://dx.doi.org/10.1038/s41467-018-07936-x |
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author | Kellenberger, Roman T. Byers, Kelsey J. R. P. De Brito Francisco, Rita M. Staedler, Yannick M. LaFountain, Amy M. Schönenberger, Jürg Schiestl, Florian P. Schlüter, Philipp M. |
author_facet | Kellenberger, Roman T. Byers, Kelsey J. R. P. De Brito Francisco, Rita M. Staedler, Yannick M. LaFountain, Amy M. Schönenberger, Jürg Schiestl, Florian P. Schlüter, Philipp M. |
author_sort | Kellenberger, Roman T. |
collection | PubMed |
description | Maintenance of polymorphism by overdominance (heterozygote advantage) is a fundamental concept in evolutionary biology. In most examples known in nature, overdominance is a result of homozygotes suffering from deleterious effects. Here we show that overdominance maintains a non-deleterious polymorphism with black, red and white floral morphs in the Alpine orchid Gymnadenia rhellicani. Phenotypic, metabolomic and transcriptomic analyses reveal that the morphs differ solely in cyanidin pigments, which are linked to differential expression of an anthocyanidin synthase (ANS) gene. This expression difference is caused by a premature stop codon in an ANS-regulating R2R3-MYB transcription factor, which is heterozygous in the red colour morph. Furthermore, field observations show that bee and fly pollinators have opposite colour preferences; this results in higher fitness (seed set) of the heterozygous morph without deleterious effects in either homozygous morph. Together, these findings demonstrate that genuine overdominance exists in nature. |
format | Online Article Text |
id | pubmed-6325131 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-63251312019-01-10 Emergence of a floral colour polymorphism by pollinator-mediated overdominance Kellenberger, Roman T. Byers, Kelsey J. R. P. De Brito Francisco, Rita M. Staedler, Yannick M. LaFountain, Amy M. Schönenberger, Jürg Schiestl, Florian P. Schlüter, Philipp M. Nat Commun Article Maintenance of polymorphism by overdominance (heterozygote advantage) is a fundamental concept in evolutionary biology. In most examples known in nature, overdominance is a result of homozygotes suffering from deleterious effects. Here we show that overdominance maintains a non-deleterious polymorphism with black, red and white floral morphs in the Alpine orchid Gymnadenia rhellicani. Phenotypic, metabolomic and transcriptomic analyses reveal that the morphs differ solely in cyanidin pigments, which are linked to differential expression of an anthocyanidin synthase (ANS) gene. This expression difference is caused by a premature stop codon in an ANS-regulating R2R3-MYB transcription factor, which is heterozygous in the red colour morph. Furthermore, field observations show that bee and fly pollinators have opposite colour preferences; this results in higher fitness (seed set) of the heterozygous morph without deleterious effects in either homozygous morph. Together, these findings demonstrate that genuine overdominance exists in nature. Nature Publishing Group UK 2019-01-08 /pmc/articles/PMC6325131/ /pubmed/30622247 http://dx.doi.org/10.1038/s41467-018-07936-x Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Kellenberger, Roman T. Byers, Kelsey J. R. P. De Brito Francisco, Rita M. Staedler, Yannick M. LaFountain, Amy M. Schönenberger, Jürg Schiestl, Florian P. Schlüter, Philipp M. Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title | Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title_full | Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title_fullStr | Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title_full_unstemmed | Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title_short | Emergence of a floral colour polymorphism by pollinator-mediated overdominance |
title_sort | emergence of a floral colour polymorphism by pollinator-mediated overdominance |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6325131/ https://www.ncbi.nlm.nih.gov/pubmed/30622247 http://dx.doi.org/10.1038/s41467-018-07936-x |
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