Increased trehalose biosynthesis in Hartig net hyphae of ectomycorrhizas.
Identifieur interne : 002F64 ( Main/Exploration ); précédent : 002F63; suivant : 002F65Increased trehalose biosynthesis in Hartig net hyphae of ectomycorrhizas.
Auteurs : M Nica Fajardo L Pez [Allemagne] ; Philipp M Nner ; Anita Willmann ; Rüdiger Hampp ; Uwe NehlsSource :
- The New phytologist [ 0028-646X ] ; 2007.
Descripteurs français
- KwdFr :
- Amanita (enzymologie), Amanita (génétique), Amanita (métabolisme), Analyse de séquence d'ADN (MeSH), Azote (métabolisme), Expression des gènes (MeSH), Glucosyltransferases (génétique), Glucosyltransferases (métabolisme), Hyphae (enzymologie), Hyphae (métabolisme), Mycorhizes (enzymologie), Mycorhizes (métabolisme), Métabolisme glucidique (MeSH), Phosphoric monoester hydrolases (génétique), Phosphoric monoester hydrolases (métabolisme), Populus (microbiologie), Populus (physiologie), Symbiose (physiologie), Séquence d'acides aminés (MeSH), Tréhalose (biosynthèse), Tréhalose (métabolisme).
- MESH :
- biosynthèse : Tréhalose.
- enzymologie : Amanita, Hyphae, Mycorhizes.
- génétique : Amanita, Glucosyltransferases, Phosphoric monoester hydrolases.
- microbiologie : Populus.
- métabolisme : Amanita, Azote, Glucosyltransferases, Hyphae, Mycorhizes, Phosphoric monoester hydrolases, Tréhalose.
- physiologie : Populus, Symbiose.
- Analyse de séquence d'ADN, Expression des gènes, Métabolisme glucidique, Séquence d'acides aminés.
English descriptors
- KwdEn :
- Amanita (enzymology), Amanita (genetics), Amanita (metabolism), Amino Acid Sequence (MeSH), Carbohydrate Metabolism (MeSH), Gene Expression (MeSH), Glucosyltransferases (genetics), Glucosyltransferases (metabolism), Hyphae (enzymology), Hyphae (metabolism), Mycorrhizae (enzymology), Mycorrhizae (metabolism), Nitrogen (metabolism), Phosphoric Monoester Hydrolases (genetics), Phosphoric Monoester Hydrolases (metabolism), Populus (microbiology), Populus (physiology), Sequence Analysis, DNA (MeSH), Symbiosis (physiology), Trehalose (biosynthesis), Trehalose (metabolism).
- MESH :
- chemical , biosynthesis : Trehalose.
- chemical , genetics : Glucosyltransferases, Phosphoric Monoester Hydrolases.
- enzymology : Amanita, Hyphae, Mycorrhizae.
- genetics : Amanita.
- metabolism : Amanita, Glucosyltransferases, Hyphae, Mycorrhizae, Nitrogen, Phosphoric Monoester Hydrolases, Trehalose.
- microbiology : Populus.
- physiology : Populus, Symbiosis.
- Amino Acid Sequence, Carbohydrate Metabolism, Gene Expression, Sequence Analysis, DNA.
Abstract
To obtain photoassimilates in ectomycorrhizal symbiosis, the fungus has to create a strong sink, for example, by conversion of plant-derived hexoses into fungus-specific compounds. Trehalose is present in large quantities in Amanita muscaria and may thus constitute an important carbon sink. In Amanita muscaria-poplar (Populus tremula x tremuloides) ectomycorrhizas, the transcript abundances of genes encoding key enzymes of fungal trehalose biosynthesis, namely trehalose-6-phosphate synthase (TPS), trehalose-6-phosphate phosphatase (TPP) and trehalose phosphorylase (TP), were increased. When mycorrhizas were separated into mantle and Hartig net, TPS, TPP and TP expression was specifically enhanced in Hartig net hyphae. Compared with the extraradical mycelium, TPS and TPP expression was only slightly increased in the fungal sheath, while the increase in the expression of TP was more pronounced. TPS enzyme activity was also elevated in Hartig net hyphae, displaying a direct correlation between transcript abundance and turnover rate. In accordance with enhanced gene expression and TPS activity, trehalose content was 2.7 times higher in the Hartig net. The enhanced trehalose biosynthesis at the plant-fungus interface indicates that trehalose is a relevant carbohydrate sink in symbiosis. As sugar and nitrogen supply affected gene expression only slightly, the strongly increased expression of the investigated genes in mycorrhizas is presumably developmentally regulated.
DOI: 10.1111/j.1469-8137.2007.01983.x
PubMed: 17388901
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Amanita (genetics)</term>
<term>Amanita (metabolism)</term>
<term>Amino Acid Sequence (MeSH)</term>
<term>Carbohydrate Metabolism (MeSH)</term>
<term>Gene Expression (MeSH)</term>
<term>Glucosyltransferases (genetics)</term>
<term>Glucosyltransferases (metabolism)</term>
<term>Hyphae (enzymology)</term>
<term>Hyphae (metabolism)</term>
<term>Mycorrhizae (enzymology)</term>
<term>Mycorrhizae (metabolism)</term>
<term>Nitrogen (metabolism)</term>
<term>Phosphoric Monoester Hydrolases (genetics)</term>
<term>Phosphoric Monoester Hydrolases (metabolism)</term>
<term>Populus (microbiology)</term>
<term>Populus (physiology)</term>
<term>Sequence Analysis, DNA (MeSH)</term>
<term>Symbiosis (physiology)</term>
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<term>Trehalose (metabolism)</term>
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<term>Amanita (génétique)</term>
<term>Amanita (métabolisme)</term>
<term>Analyse de séquence d'ADN (MeSH)</term>
<term>Azote (métabolisme)</term>
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<term>Glucosyltransferases (génétique)</term>
<term>Glucosyltransferases (métabolisme)</term>
<term>Hyphae (enzymologie)</term>
<term>Hyphae (métabolisme)</term>
<term>Mycorhizes (enzymologie)</term>
<term>Mycorhizes (métabolisme)</term>
<term>Métabolisme glucidique (MeSH)</term>
<term>Phosphoric monoester hydrolases (génétique)</term>
<term>Phosphoric monoester hydrolases (métabolisme)</term>
<term>Populus (microbiologie)</term>
<term>Populus (physiologie)</term>
<term>Symbiose (physiologie)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Tréhalose (biosynthèse)</term>
<term>Tréhalose (métabolisme)</term>
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<term>Hyphae</term>
<term>Mycorhizes</term>
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<term>Hyphae</term>
<term>Mycorrhizae</term>
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<term>Glucosyltransferases</term>
<term>Phosphoric monoester hydrolases</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Amanita</term>
<term>Glucosyltransferases</term>
<term>Hyphae</term>
<term>Mycorrhizae</term>
<term>Nitrogen</term>
<term>Phosphoric Monoester Hydrolases</term>
<term>Trehalose</term>
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<keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr"><term>Populus</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Populus</term>
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<term>Carbohydrate Metabolism</term>
<term>Gene Expression</term>
<term>Sequence Analysis, DNA</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Analyse de séquence d'ADN</term>
<term>Expression des gènes</term>
<term>Métabolisme glucidique</term>
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<front><div type="abstract" xml:lang="en">To obtain photoassimilates in ectomycorrhizal symbiosis, the fungus has to create a strong sink, for example, by conversion of plant-derived hexoses into fungus-specific compounds. Trehalose is present in large quantities in Amanita muscaria and may thus constitute an important carbon sink. In Amanita muscaria-poplar (Populus tremula x tremuloides) ectomycorrhizas, the transcript abundances of genes encoding key enzymes of fungal trehalose biosynthesis, namely trehalose-6-phosphate synthase (TPS), trehalose-6-phosphate phosphatase (TPP) and trehalose phosphorylase (TP), were increased. When mycorrhizas were separated into mantle and Hartig net, TPS, TPP and TP expression was specifically enhanced in Hartig net hyphae. Compared with the extraradical mycelium, TPS and TPP expression was only slightly increased in the fungal sheath, while the increase in the expression of TP was more pronounced. TPS enzyme activity was also elevated in Hartig net hyphae, displaying a direct correlation between transcript abundance and turnover rate. In accordance with enhanced gene expression and TPS activity, trehalose content was 2.7 times higher in the Hartig net. The enhanced trehalose biosynthesis at the plant-fungus interface indicates that trehalose is a relevant carbohydrate sink in symbiosis. As sugar and nitrogen supply affected gene expression only slightly, the strongly increased expression of the investigated genes in mycorrhizas is presumably developmentally regulated.</div>
</front>
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<ArticleTitle>Increased trehalose biosynthesis in Hartig net hyphae of ectomycorrhizas.</ArticleTitle>
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<Abstract><AbstractText>To obtain photoassimilates in ectomycorrhizal symbiosis, the fungus has to create a strong sink, for example, by conversion of plant-derived hexoses into fungus-specific compounds. Trehalose is present in large quantities in Amanita muscaria and may thus constitute an important carbon sink. In Amanita muscaria-poplar (Populus tremula x tremuloides) ectomycorrhizas, the transcript abundances of genes encoding key enzymes of fungal trehalose biosynthesis, namely trehalose-6-phosphate synthase (TPS), trehalose-6-phosphate phosphatase (TPP) and trehalose phosphorylase (TP), were increased. When mycorrhizas were separated into mantle and Hartig net, TPS, TPP and TP expression was specifically enhanced in Hartig net hyphae. Compared with the extraradical mycelium, TPS and TPP expression was only slightly increased in the fungal sheath, while the increase in the expression of TP was more pronounced. TPS enzyme activity was also elevated in Hartig net hyphae, displaying a direct correlation between transcript abundance and turnover rate. In accordance with enhanced gene expression and TPS activity, trehalose content was 2.7 times higher in the Hartig net. The enhanced trehalose biosynthesis at the plant-fungus interface indicates that trehalose is a relevant carbohydrate sink in symbiosis. As sugar and nitrogen supply affected gene expression only slightly, the strongly increased expression of the investigated genes in mycorrhizas is presumably developmentally regulated.</AbstractText>
</Abstract>
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<ChemicalList><Chemical><RegistryNumber>B8WCK70T7I</RegistryNumber>
<NameOfSubstance UI="D014199">Trehalose</NameOfSubstance>
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<Chemical><RegistryNumber>EC 2.4.1.-</RegistryNumber>
<NameOfSubstance UI="D005964">Glucosyltransferases</NameOfSubstance>
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<Chemical><RegistryNumber>EC 2.4.1.15</RegistryNumber>
<NameOfSubstance UI="C023180">trehalose-6-phosphate synthase</NameOfSubstance>
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<NameOfSubstance UI="C023181">alpha,alpha-trehalose phosphorylase</NameOfSubstance>
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<Chemical><RegistryNumber>EC 3.1.3.12</RegistryNumber>
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<MeshHeadingList><MeshHeading><DescriptorName UI="D000545" MajorTopicYN="N">Amanita</DescriptorName>
<QualifierName UI="Q000201" MajorTopicYN="N">enzymology</QualifierName>
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<MeshHeading><DescriptorName UI="D010744" MajorTopicYN="N">Phosphoric Monoester Hydrolases</DescriptorName>
<QualifierName UI="Q000235" MajorTopicYN="N">genetics</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName>
<QualifierName UI="Q000382" MajorTopicYN="Y">microbiology</QualifierName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D017422" MajorTopicYN="N">Sequence Analysis, DNA</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D013559" MajorTopicYN="N">Symbiosis</DescriptorName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D014199" MajorTopicYN="N">Trehalose</DescriptorName>
<QualifierName UI="Q000096" MajorTopicYN="Y">biosynthesis</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<name sortKey="Nehls, Uwe" sort="Nehls, Uwe" uniqKey="Nehls U" first="Uwe" last="Nehls">Uwe Nehls</name>
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{{Explor lien |wiki= Bois |area= MycorrhizaeV1 |flux= Main |étape= Exploration |type= RBID |clé= pubmed:17388901 |texte= Increased trehalose biosynthesis in Hartig net hyphae of ectomycorrhizas. }}
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