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Patterns of Genetic Diversification in the Invasive Hybrid Plant Pathogen Phytophthora × alni and Its Parental Species P. uniformis.

Identifieur interne : 000097 ( Main/Exploration ); précédent : 000096; suivant : 000098

Patterns of Genetic Diversification in the Invasive Hybrid Plant Pathogen Phytophthora × alni and Its Parental Species P. uniformis.

Auteurs : Goda Mizeriene [Suisse, Lituanie] ; Karel Cerny ; Vladimir Zyka ; J Zsef Bakonyi [Hongrie] ; Zoltán Rpád Nagy [République tchèque] ; Jonas Oliva [Espagne] ; Miguel Angel Redondo [Suède] ; Tamara Corcobado [République tchèque, Autriche] ; Jorge Martín-García [Portugal, Espagne] ; Simone Prospero [Suisse]

Source :

RBID : pubmed:32633698

Abstract

In pathogenic fungi and oomycetes, interspecific hybridization may lead to the formation of new species having a greater impact on natural ecosystems than the parental species. From the early 1990s, a severe alder (Alnus spp.) decline due to an unknown Phytophthora species was observed in several European countries. Genetic analyses revealed that the disease was caused by the triploid hybrid P. × alni, which originated in Europe from the hybridization of P. uniformis and P. × multiformis. Here, we investigated the population structure of P. × alni (158 isolates) and P. uniformis (85 isolates) in several European countries using microsatellite markers. Our analyses confirmed the genetic structure previously observed in other European populations, with P. uniformis populations consisting of at most two multilocus genotypes (MLGs) and P. × alni populations dominated by MLG Pxa-1. The genetic structure of P. × alni populations in the Czech Republic, Hungary and Sweden seemed to reflect the physical isolation of river systems. Most rare P. × alni MLGs showed a loss of heterozygosity (LOH) at one or a few microsatellite loci compared with other MLGs. This LOH may allow a stabilization within the P. × alni genome or a rapid adaptation to stress situations. Alternatively, alleles may be lost because of random genetic drift in small, isolated populations, with no effect on fitness of P. × alni. Additional studies would be necessary to confirm these patterns of population diversification and to better understand the factors driving it.

DOI: 10.1094/PHYTO-12-19-0475-R
PubMed: 32633698


Affiliations:


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Le document en format XML

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<title xml:lang="en">Patterns of Genetic Diversification in the Invasive Hybrid Plant Pathogen
<i>Phytophthora</i>
×
<i>alni</i>
and Its Parental Species
<i>P. uniformis</i>
.</title>
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<name sortKey="Zyka, Vladimir" sort="Zyka, Vladimir" uniqKey="Zyka V" first="Vladimir" last="Zyka">Vladimir Zyka</name>
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<name sortKey="Nagy, Zoltan Rpad" sort="Nagy, Zoltan Rpad" uniqKey="Nagy Z" first="Zoltán Rpád" last="Nagy">Zoltán Rpád Nagy</name>
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<name sortKey="Oliva, Jonas" sort="Oliva, Jonas" uniqKey="Oliva J" first="Jonas" last="Oliva">Jonas Oliva</name>
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<nlm:affiliation>Department Crop and Forest Sciences, University of Lleida, Alcalde Rovira Roure 191, 25198, Lleida, Spain.</nlm:affiliation>
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<nlm:affiliation>Joint Research Unit CTFC-Agrotecnio, Alcalde Rovira Roure 191 Lleida, 25198, Spain.</nlm:affiliation>
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<wicri:regionArea>Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Box 7026, 750 07 Uppsala</wicri:regionArea>
<wicri:noRegion>750 07 Uppsala</wicri:noRegion>
</affiliation>
</author>
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<name sortKey="Corcobado, Tamara" sort="Corcobado, Tamara" uniqKey="Corcobado T" first="Tamara" last="Corcobado">Tamara Corcobado</name>
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<country xml:lang="fr">Espagne</country>
<wicri:regionArea>Department of Plant Production and Forest Resources, University of Valladolid, Avenida de Madrid 44, 34071 Palencia</wicri:regionArea>
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<div type="abstract" xml:lang="en">In pathogenic fungi and oomycetes, interspecific hybridization may lead to the formation of new species having a greater impact on natural ecosystems than the parental species. From the early 1990s, a severe alder (
<i>Alnus</i>
spp.) decline due to an unknown
<i>Phytophthora</i>
species was observed in several European countries. Genetic analyses revealed that the disease was caused by the triploid hybrid
<i>P.</i>
×
<i>alni</i>
, which originated in Europe from the hybridization of
<i>P. uniformis</i>
and
<i>P.</i>
×
<i>multiformis</i>
. Here, we investigated the population structure of
<i>P.</i>
×
<i>alni</i>
(158 isolates) and
<i>P. uniformis</i>
(85 isolates) in several European countries using microsatellite markers. Our analyses confirmed the genetic structure previously observed in other European populations, with
<i>P. uniformis</i>
populations consisting of at most two multilocus genotypes (MLGs) and
<i>P.</i>
×
<i>alni</i>
populations dominated by MLG Pxa-1. The genetic structure of
<i>P.</i>
×
<i>alni</i>
populations in the Czech Republic, Hungary and Sweden seemed to reflect the physical isolation of river systems. Most rare
<i>P.</i>
×
<i>alni</i>
MLGs showed a loss of heterozygosity (LOH) at one or a few microsatellite loci compared with other MLGs. This LOH may allow a stabilization within the
<i>P.</i>
×
<i>alni</i>
genome or a rapid adaptation to stress situations. Alternatively, alleles may be lost because of random genetic drift in small, isolated populations, with no effect on fitness of
<i>P.</i>
×
<i>alni</i>
. Additional studies would be necessary to confirm these patterns of population diversification and to better understand the factors driving it.</div>
</front>
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<ArticleTitle>Patterns of Genetic Diversification in the Invasive Hybrid Plant Pathogen
<i>Phytophthora</i>
×
<i>alni</i>
and Its Parental Species
<i>P. uniformis</i>
.</ArticleTitle>
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<Abstract>
<AbstractText>In pathogenic fungi and oomycetes, interspecific hybridization may lead to the formation of new species having a greater impact on natural ecosystems than the parental species. From the early 1990s, a severe alder (
<i>Alnus</i>
spp.) decline due to an unknown
<i>Phytophthora</i>
species was observed in several European countries. Genetic analyses revealed that the disease was caused by the triploid hybrid
<i>P.</i>
×
<i>alni</i>
, which originated in Europe from the hybridization of
<i>P. uniformis</i>
and
<i>P.</i>
×
<i>multiformis</i>
. Here, we investigated the population structure of
<i>P.</i>
×
<i>alni</i>
(158 isolates) and
<i>P. uniformis</i>
(85 isolates) in several European countries using microsatellite markers. Our analyses confirmed the genetic structure previously observed in other European populations, with
<i>P. uniformis</i>
populations consisting of at most two multilocus genotypes (MLGs) and
<i>P.</i>
×
<i>alni</i>
populations dominated by MLG Pxa-1. The genetic structure of
<i>P.</i>
×
<i>alni</i>
populations in the Czech Republic, Hungary and Sweden seemed to reflect the physical isolation of river systems. Most rare
<i>P.</i>
×
<i>alni</i>
MLGs showed a loss of heterozygosity (LOH) at one or a few microsatellite loci compared with other MLGs. This LOH may allow a stabilization within the
<i>P.</i>
×
<i>alni</i>
genome or a rapid adaptation to stress situations. Alternatively, alleles may be lost because of random genetic drift in small, isolated populations, with no effect on fitness of
<i>P.</i>
×
<i>alni</i>
. Additional studies would be necessary to confirm these patterns of population diversification and to better understand the factors driving it.</AbstractText>
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