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Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms

Rate variation in genes from all three genomes has been observed frequently in plant lineages with a parasitic and mycoheterotrophic mode of life. While the loss of photosynthetic ability leads to a relaxation of evolutionary constraints in genes involved in the photosynthetic apparatus, it remains...

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Autores principales: Lemaire, Benny, Huysmans, Suzy, Smets, Erik, Merckx, Vincent
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Japan 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159761/
https://www.ncbi.nlm.nih.gov/pubmed/21188459
http://dx.doi.org/10.1007/s10265-010-0395-5
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author Lemaire, Benny
Huysmans, Suzy
Smets, Erik
Merckx, Vincent
author_facet Lemaire, Benny
Huysmans, Suzy
Smets, Erik
Merckx, Vincent
author_sort Lemaire, Benny
collection PubMed
description Rate variation in genes from all three genomes has been observed frequently in plant lineages with a parasitic and mycoheterotrophic mode of life. While the loss of photosynthetic ability leads to a relaxation of evolutionary constraints in genes involved in the photosynthetic apparatus, it remains to be determined how prevalent increased substitution rates are in nuclear DNA of non-photosynthetic angiosperms. In this study we infer rates of molecular evolution of 18S rDNA of all parasitic and mycoheterotorphic plant families (except Lauraceae and Polygalaceae) using relative rate tests. In several holoparasitic and mycoheterotrophic plant lineages extremely high substitution rates are observed compared to other photosynthetic angiosperms. The position and frequency of these substitutions have been identified to understand the mutation dynamics of 18S rRNA in achlorophyllous plants. Despite the presence of significantly elevated substitution rates, very few mutations occur in major functional and structural regions of the small ribosomal molecule, providing evidence that the efficiency of the translational apparatus in non-photosynthetic plants has not been affected.
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spelling pubmed-31597612011-09-21 Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms Lemaire, Benny Huysmans, Suzy Smets, Erik Merckx, Vincent J Plant Res Regular Paper Rate variation in genes from all three genomes has been observed frequently in plant lineages with a parasitic and mycoheterotrophic mode of life. While the loss of photosynthetic ability leads to a relaxation of evolutionary constraints in genes involved in the photosynthetic apparatus, it remains to be determined how prevalent increased substitution rates are in nuclear DNA of non-photosynthetic angiosperms. In this study we infer rates of molecular evolution of 18S rDNA of all parasitic and mycoheterotorphic plant families (except Lauraceae and Polygalaceae) using relative rate tests. In several holoparasitic and mycoheterotrophic plant lineages extremely high substitution rates are observed compared to other photosynthetic angiosperms. The position and frequency of these substitutions have been identified to understand the mutation dynamics of 18S rRNA in achlorophyllous plants. Despite the presence of significantly elevated substitution rates, very few mutations occur in major functional and structural regions of the small ribosomal molecule, providing evidence that the efficiency of the translational apparatus in non-photosynthetic plants has not been affected. Springer Japan 2010-12-25 2011 /pmc/articles/PMC3159761/ /pubmed/21188459 http://dx.doi.org/10.1007/s10265-010-0395-5 Text en © The Author(s) 2010 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
spellingShingle Regular Paper
Lemaire, Benny
Huysmans, Suzy
Smets, Erik
Merckx, Vincent
Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title_full Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title_fullStr Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title_full_unstemmed Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title_short Rate accelerations in nuclear 18S rDNA of mycoheterotrophic and parasitic angiosperms
title_sort rate accelerations in nuclear 18s rdna of mycoheterotrophic and parasitic angiosperms
topic Regular Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159761/
https://www.ncbi.nlm.nih.gov/pubmed/21188459
http://dx.doi.org/10.1007/s10265-010-0395-5
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