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Guillaume Bécard - One of the best experts on this subject based on the ideXlab platform.
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strigolactones stimulate arbuscular mycorrhizal fungi by activating mitochondria
PLOS Biology, 2006Co-Authors: Arnaud Besserer, Guillaume Bécard, Jean-charles Portais, Virginie Puechpages, Patrick Kiefer, Victoria Gomezroldan, Alain Jauneau, Christophe Roux, Nathalie SejalondelmasAbstract:The association of arbuscular mycorrhizal (AM) fungi with plant roots is the oldest and ecologically most important symbiotic relationship between higher plants and microorganisms, yet the mechanism by which these fungi detect the presence of a plant host is poorly understood. Previous studies have shown that roots secrete a Branching Factor (BF) that strongly stimulates Branching of hyphae during germination of the spores of AM fungi. In the BF of Lotus, a strigolactone was found to be the active molecule. Strigolactones are known as germination stimulants of the parasitic plants Striga and Orobanche. In this paper, we show that the BF of a monocotyledonous plant, Sorghum, also contains a strigolactone. Strigolactones strongly and rapidly stimulated cell proliferation of the AM fungus Gigaspora rosea at concentrations as low as 10 −13 M. This effect was not found with other sesquiterperne lactones known as germination stimulants of parasitic weeds. Within 1 h of treatment, the density of mitochondria in the fungal cells increased, and their shape and movement changed dramatically. Strigolactones stimulated spore germination of two other phylogenetically distant AM fungi, Glomus intraradices and Gl. claroideum. This was also associated with a rapid increase of mitochondrial density and respiration as shown with Gl. intraradices. We conclude that strigolactones are important rhizospheric plant signals involved in stimulating both the pre-symbiotic growth of AM fungi and the germination of parasitic plants.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for the development of AM fungi.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for...
Alain Jauneau - One of the best experts on this subject based on the ideXlab platform.
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strigolactones stimulate arbuscular mycorrhizal fungi by activating mitochondria
PLOS Biology, 2006Co-Authors: Arnaud Besserer, Guillaume Bécard, Jean-charles Portais, Virginie Puechpages, Patrick Kiefer, Victoria Gomezroldan, Alain Jauneau, Christophe Roux, Nathalie SejalondelmasAbstract:The association of arbuscular mycorrhizal (AM) fungi with plant roots is the oldest and ecologically most important symbiotic relationship between higher plants and microorganisms, yet the mechanism by which these fungi detect the presence of a plant host is poorly understood. Previous studies have shown that roots secrete a Branching Factor (BF) that strongly stimulates Branching of hyphae during germination of the spores of AM fungi. In the BF of Lotus, a strigolactone was found to be the active molecule. Strigolactones are known as germination stimulants of the parasitic plants Striga and Orobanche. In this paper, we show that the BF of a monocotyledonous plant, Sorghum, also contains a strigolactone. Strigolactones strongly and rapidly stimulated cell proliferation of the AM fungus Gigaspora rosea at concentrations as low as 10 −13 M. This effect was not found with other sesquiterperne lactones known as germination stimulants of parasitic weeds. Within 1 h of treatment, the density of mitochondria in the fungal cells increased, and their shape and movement changed dramatically. Strigolactones stimulated spore germination of two other phylogenetically distant AM fungi, Glomus intraradices and Gl. claroideum. This was also associated with a rapid increase of mitochondrial density and respiration as shown with Gl. intraradices. We conclude that strigolactones are important rhizospheric plant signals involved in stimulating both the pre-symbiotic growth of AM fungi and the germination of parasitic plants.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for the development of AM fungi.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for...
Marc Buee - One of the best experts on this subject based on the ideXlab platform.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for the development of AM fungi.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for...
Raoul Ranjeva - One of the best experts on this subject based on the ideXlab platform.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for the development of AM fungi.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for...
M Rossignol - One of the best experts on this subject based on the ideXlab platform.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for the development of AM fungi.
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the pre symbiotic growth of arbuscular mycorrhizal fungi is induced by a Branching Factor partially purified from plant root exudates
Molecular Plant-microbe Interactions, 2000Co-Authors: Marc Buee, Alain Jauneau, M Rossignol, Raoul Ranjeva, Guillaume BécardAbstract:Arbuscular mycorrhizal (AM) symbiosis is an association between obligate biotrophic fungi and more than 80% of land plants. During the pre-symbiotic phase, the host plant releases critical metabolites necessary to trigger fungal growth and root colonization. We describe the isolation of a semipurified fraction from exudates of carrot hairy roots, highly active on germinating spores of Gigaspora gigantea, G. rosea, and G. margarita. This fraction, isolated on the basis of its activity on hyphal Branching, contains a root Factor (one or several molecules) that stimulates, directly or indirectly, G. gigantea nuclear division. We demonstrate the presence of this active Factor in root exudates of all mycotrophic plant species tested (eight species) but not in those of nonhost plant species (four species). We negatively tested the hypothesis that it was a flavonoid or a compound synthesized via the flavonoid pathway. We propose that this root Factor, yet to be chemically characterized, is a key plant signal for...