Exploring the role of asexual multiplication in poplar rust epidemics: impact on diversity and genetic structure.
Identifieur interne : 000060 ( Main/Exploration ); précédent : 000059; suivant : 000061Exploring the role of asexual multiplication in poplar rust epidemics: impact on diversity and genetic structure.
Auteurs : Benoît Barrès [France] ; Cyril Dutech ; Axelle Andrieux ; Fabien Halkett ; Pascal FreySource :
- Molecular ecology [ 1365-294X ] ; 2012.
Descripteurs français
- KwdFr :
- ADN fongique (génétique), Analyse de séquence d'ADN (MeSH), Basidiomycota (génétique), Feuilles de plante (microbiologie), Génotype (MeSH), Génétique des populations (méthodes), Maladies des plantes (microbiologie), Populus (microbiologie), Reproduction asexuée (MeSH), Répétitions microsatellites (MeSH), Variation génétique (MeSH).
- MESH :
- génétique : ADN fongique, Basidiomycota.
- microbiologie : Feuilles de plante, Maladies des plantes, Populus.
- méthodes : Génétique des populations.
- Analyse de séquence d'ADN, Génotype, Reproduction asexuée, Répétitions microsatellites, Variation génétique.
English descriptors
- KwdEn :
- Basidiomycota (genetics), DNA, Fungal (genetics), Genetic Variation (MeSH), Genetics, Population (methods), Genotype (MeSH), Microsatellite Repeats (MeSH), Plant Diseases (microbiology), Plant Leaves (microbiology), Populus (microbiology), Reproduction, Asexual (MeSH), Sequence Analysis, DNA (MeSH).
- MESH :
- chemical , genetics : DNA, Fungal.
- genetics : Basidiomycota.
- methods : Genetics, Population.
- microbiology : Plant Diseases, Plant Leaves, Populus.
- Genetic Variation, Genotype, Microsatellite Repeats, Reproduction, Asexual, Sequence Analysis, DNA.
Abstract
Fungal plant pathogens, especially rust fungi (Pucciniales), are well known for their complex life cycles, which include phases of sexual and asexual reproduction. The effect of asexual multiplication on population genetic diversity has been investigated in the poplar rust fungus Melampsora larici-populina using a nested hierarchical sampling scheme. Four hierarchical levels were considered: leaf, twig, tree and site. Both cultivated and wild poplar stands were sampled at two time points at the start and end of rust epidemics. A total of 641 fungal isolates was analysed using nine microsatellite markers. This study revealed that the genetic signature of asexual multiplication in the wild poplar stand was seen only at lower hierarchical levels (leaf and twig). Moreover, we observed an erosion of clonal structure through time, with an increase in both gene and genotypic diversity. New genotypes contributed to host infection over time, which demonstrates the importance of allo-infection in the epidemic process in this host-pathogen system. Compared with the wild stands, the nearly lack of detection of clonal structure in the cultivated stands reflects the higher infection level on cultivated poplars. More generally, this genetic analysis illustrates the utility of population genetics approach for elucidating the proportion of asexual reproduction in the multiplication of isolates during an epidemic, and for proper quantification of asexual dispersal in plant pathogens.
DOI: 10.1111/mec.12008
PubMed: 22967194
Affiliations:
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The effect of asexual multiplication on population genetic diversity has been investigated in the poplar rust fungus Melampsora larici-populina using a nested hierarchical sampling scheme. Four hierarchical levels were considered: leaf, twig, tree and site. Both cultivated and wild poplar stands were sampled at two time points at the start and end of rust epidemics. A total of 641 fungal isolates was analysed using nine microsatellite markers. This study revealed that the genetic signature of asexual multiplication in the wild poplar stand was seen only at lower hierarchical levels (leaf and twig). Moreover, we observed an erosion of clonal structure through time, with an increase in both gene and genotypic diversity. New genotypes contributed to host infection over time, which demonstrates the importance of allo-infection in the epidemic process in this host-pathogen system. Compared with the wild stands, the nearly lack of detection of clonal structure in the cultivated stands reflects the higher infection level on cultivated poplars. More generally, this genetic analysis illustrates the utility of population genetics approach for elucidating the proportion of asexual reproduction in the multiplication of isolates during an epidemic, and for proper quantification of asexual dispersal in plant pathogens.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">22967194</PMID><DateCompleted><Year>2013</Year><Month>01</Month><Day>30</Day></DateCompleted><DateRevised><Year>2012</Year><Month>10</Month><Day>12</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1365-294X</ISSN><JournalIssue CitedMedium="Internet"><Volume>21</Volume><Issue>20</Issue><PubDate><Year>2012</Year><Month>Oct</Month></PubDate></JournalIssue><Title>Molecular ecology</Title><ISOAbbreviation>Mol Ecol</ISOAbbreviation></Journal><ArticleTitle>Exploring the role of asexual multiplication in poplar rust epidemics: impact on diversity and genetic structure.</ArticleTitle><Pagination><MedlinePgn>4996-5008</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/mec.12008</ELocationID><Abstract><AbstractText>Fungal plant pathogens, especially rust fungi (Pucciniales), are well known for their complex life cycles, which include phases of sexual and asexual reproduction. The effect of asexual multiplication on population genetic diversity has been investigated in the poplar rust fungus Melampsora larici-populina using a nested hierarchical sampling scheme. Four hierarchical levels were considered: leaf, twig, tree and site. Both cultivated and wild poplar stands were sampled at two time points at the start and end of rust epidemics. A total of 641 fungal isolates was analysed using nine microsatellite markers. This study revealed that the genetic signature of asexual multiplication in the wild poplar stand was seen only at lower hierarchical levels (leaf and twig). Moreover, we observed an erosion of clonal structure through time, with an increase in both gene and genotypic diversity. New genotypes contributed to host infection over time, which demonstrates the importance of allo-infection in the epidemic process in this host-pathogen system. Compared with the wild stands, the nearly lack of detection of clonal structure in the cultivated stands reflects the higher infection level on cultivated poplars. 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sortKey="Halkett, Fabien" sort="Halkett, Fabien" uniqKey="Halkett F" first="Fabien" last="Halkett">Fabien Halkett</name></noCountry><country name="France"><region name="Grand Est"><name sortKey="Barres, Benoit" sort="Barres, Benoit" uniqKey="Barres B" first="Benoît" last="Barrès">Benoît Barrès</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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