Investigation of horizontal gene transfer in poplar/Amanita muscaria ectomycorrhizas.
Identifieur interne : 003E89 ( Main/Exploration ); précédent : 003E88; suivant : 003E90Investigation of horizontal gene transfer in poplar/Amanita muscaria ectomycorrhizas.
Auteurs : Chi Zhang [Allemagne] ; Rüdiger Hampp ; Uwe NehlsSource :
- Environmental biosafety research [ 1635-7922 ]
Descripteurs français
- KwdFr :
- MESH :
- analyse : ADN des plantes, ADN fongique.
- génétique : Amanita, Populus, Symbiose.
- Mycorhizes, Transfert horizontal de gène, Transformation génétique, Végétaux génétiquement modifiés.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : DNA, Fungal, DNA, Plant.
- genetics : Amanita, Populus, Symbiosis.
- Gene Transfer, Horizontal, Mycorrhizae, Plants, Genetically Modified, Transformation, Genetic.
Abstract
Fine roots of forest trees form together with certain soil fungi symbiotic structures (ectomycorrhizas), where fungal hyphae are in intimate contact with plant cells. Due to root cell degeneration, plant DNA is released and could be taken up by the fungus. The possibility that horizontal gene transfer might result in a risk for the environment should be evaluated before a massive release of genetically engineered trees into nature occurs, even though only a few convincing examples of horizontal gene transfer are known. Transgenic poplars containing a construct of the Streptomyces hygroscopicus bar gene under the control of the Cochliobolus heterostrophus GPD (glyceraldehyde-3-phosphate dehydrogenase) promoter were generated by Agrobacterium-mediated transformation. The functionality of this construct in the ectomycorrhizal model fungus Amanita muscaria was previously verified by protoplast-based fungal transformation. 35,000 ectomycorrhizas, formed between transgenic poplars and non-transgenic A. muscaria hyphae, were isolated and transferred to selective agar plates. Putative herbicide-resistant fungal colonies were obtained after the first round of selection. However, none of these colonies survived a transfer onto fresh selection medium, nor did they contain the bar gene, indicating that no horizontal gene transfer from poplar to A. muscaria occurred during symbiosis under axenic conditions. However, since ectomycorrhizas are associated under natural conditions with viruses, bacteria and other fungi, these additional associations should be evaluated in future.
DOI: 10.1051/ebr:2006004
PubMed: 16827551
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<author><name sortKey="Zhang, Chi" sort="Zhang, Chi" uniqKey="Zhang C" first="Chi" last="Zhang">Chi Zhang</name>
<affiliation wicri:level="3"><nlm:affiliation>Universität Tübingen, Botanisches Institut, Physiologische Okologie der Pflanzen, Auf der Morgenstelle 1, 72076 Tübingen, Germany.</nlm:affiliation>
<country xml:lang="fr">Allemagne</country>
<wicri:regionArea>Universität Tübingen, Botanisches Institut, Physiologische Okologie der Pflanzen, Auf der Morgenstelle 1, 72076 Tübingen</wicri:regionArea>
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<affiliation wicri:level="3"><nlm:affiliation>Universität Tübingen, Botanisches Institut, Physiologische Okologie der Pflanzen, Auf der Morgenstelle 1, 72076 Tübingen, Germany.</nlm:affiliation>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amanita (genetics)</term>
<term>DNA, Fungal (analysis)</term>
<term>DNA, Plant (analysis)</term>
<term>Gene Transfer, Horizontal (MeSH)</term>
<term>Mycorrhizae (MeSH)</term>
<term>Plants, Genetically Modified (MeSH)</term>
<term>Populus (genetics)</term>
<term>Symbiosis (genetics)</term>
<term>Transformation, Genetic (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>ADN des plantes (analyse)</term>
<term>ADN fongique (analyse)</term>
<term>Amanita (génétique)</term>
<term>Mycorhizes (MeSH)</term>
<term>Populus (génétique)</term>
<term>Symbiose (génétique)</term>
<term>Transfert horizontal de gène (MeSH)</term>
<term>Transformation génétique (MeSH)</term>
<term>Végétaux génétiquement modifiés (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>DNA, Fungal</term>
<term>DNA, Plant</term>
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<keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>ADN des plantes</term>
<term>ADN fongique</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Amanita</term>
<term>Populus</term>
<term>Symbiosis</term>
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<keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Amanita</term>
<term>Populus</term>
<term>Symbiose</term>
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<keywords scheme="MESH" xml:lang="en"><term>Gene Transfer, Horizontal</term>
<term>Mycorrhizae</term>
<term>Plants, Genetically Modified</term>
<term>Transformation, Genetic</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Mycorhizes</term>
<term>Transfert horizontal de gène</term>
<term>Transformation génétique</term>
<term>Végétaux génétiquement modifiés</term>
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<front><div type="abstract" xml:lang="en">Fine roots of forest trees form together with certain soil fungi symbiotic structures (ectomycorrhizas), where fungal hyphae are in intimate contact with plant cells. Due to root cell degeneration, plant DNA is released and could be taken up by the fungus. The possibility that horizontal gene transfer might result in a risk for the environment should be evaluated before a massive release of genetically engineered trees into nature occurs, even though only a few convincing examples of horizontal gene transfer are known. Transgenic poplars containing a construct of the Streptomyces hygroscopicus bar gene under the control of the Cochliobolus heterostrophus GPD (glyceraldehyde-3-phosphate dehydrogenase) promoter were generated by Agrobacterium-mediated transformation. The functionality of this construct in the ectomycorrhizal model fungus Amanita muscaria was previously verified by protoplast-based fungal transformation. 35,000 ectomycorrhizas, formed between transgenic poplars and non-transgenic A. muscaria hyphae, were isolated and transferred to selective agar plates. Putative herbicide-resistant fungal colonies were obtained after the first round of selection. However, none of these colonies survived a transfer onto fresh selection medium, nor did they contain the bar gene, indicating that no horizontal gene transfer from poplar to A. muscaria occurred during symbiosis under axenic conditions. However, since ectomycorrhizas are associated under natural conditions with viruses, bacteria and other fungi, these additional associations should be evaluated in future.</div>
</front>
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<Title>Environmental biosafety research</Title>
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<Abstract><AbstractText>Fine roots of forest trees form together with certain soil fungi symbiotic structures (ectomycorrhizas), where fungal hyphae are in intimate contact with plant cells. Due to root cell degeneration, plant DNA is released and could be taken up by the fungus. The possibility that horizontal gene transfer might result in a risk for the environment should be evaluated before a massive release of genetically engineered trees into nature occurs, even though only a few convincing examples of horizontal gene transfer are known. Transgenic poplars containing a construct of the Streptomyces hygroscopicus bar gene under the control of the Cochliobolus heterostrophus GPD (glyceraldehyde-3-phosphate dehydrogenase) promoter were generated by Agrobacterium-mediated transformation. The functionality of this construct in the ectomycorrhizal model fungus Amanita muscaria was previously verified by protoplast-based fungal transformation. 35,000 ectomycorrhizas, formed between transgenic poplars and non-transgenic A. muscaria hyphae, were isolated and transferred to selective agar plates. Putative herbicide-resistant fungal colonies were obtained after the first round of selection. However, none of these colonies survived a transfer onto fresh selection medium, nor did they contain the bar gene, indicating that no horizontal gene transfer from poplar to A. muscaria occurred during symbiosis under axenic conditions. However, since ectomycorrhizas are associated under natural conditions with viruses, bacteria and other fungi, these additional associations should be evaluated in future.</AbstractText>
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