High genetic variability and low local diversity in a population of arbuscular mycorrhizal fungi.

Details

Serval ID
serval:BIB_68F45AA1F8AA
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
High genetic variability and low local diversity in a population of arbuscular mycorrhizal fungi.
Journal
Proceedings of the National Academy of Sciences of the United States of America
Author(s)
Koch A.M., Kuhn G., Fontanillas P., Fumagalli L., Goudet J., Sanders I.R.
ISSN
0027-8424
Publication state
Published
Issued date
2004
Peer-reviewed
Oui
Volume
101
Number
8
Pages
2369-2374
Language
english
Abstract
Arbuscular mycorrhizal fungi (AMF) are ecologically important root symbionts of most terrestrial plants. Ecological studies of AMF have concentrated on differences between species; largely assuming little variability within AMF species. Although AMF are clonal, they have evolved to contain a surprisingly high within-species genetic variability, and genetically different nuclei can coexist within individual spores. These traits could potentially lead to within-population genetic variation, causing differences in physiology and symbiotic function in AMF populations, a consequence that has been largely neglected. We found highly significant genetic and phenotypic variation among isolates of a population of Glomus intraradices but relatively low total observed genetic diversity. Because we maintained the isolated population in a constant environment, phenotypic variation can be considered as variation in quantitative genetic traits. In view of the large genetic differences among isolates by randomly sampling two individual spores, <50% of the total observed population genetic diversity is represented. Adding an isolate from a distant population did not increase total observed genetic diversity. Genetic variation exceeded variation in quantitative genetic traits, indicating that selection acted on the population to retain similar traits, which might be because of the multigenomic nature of AMF, where considerable genetic redundancy could buffer the effects of changes in the genetic content of phenotypic traits. These results have direct implications for ecological research and for studying AMF genes, improving commercial AMF inoculum, and understanding evolutionary mechanisms in multigenomic organisms.
Keywords
Analysis of Variance, Evolution, Molecular, Genetic Variation, Mycorrhizae/classification, Mycorrhizae/genetics, Phenotype, Phylogeny, Trees/microbiology
Pubmed
Web of science
Open Access
Yes
Create date
19/11/2007 10:31
Last modification date
20/08/2019 14:24
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