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Registros recuperados: 8
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An STE12 gene identified in the mycorrhizal fungus Glomus intraradices restores infectivity of a hemibiotrophic plant pathogen Inra
Tollot, M.; Wong Sak Hoi, J.; Van Tuinen, D.; Arnould, C.; Chatagnier, O.; Dumas, B.; Gianinazzi-Pearson, V.; Seddas, P..
* • Mechanisms of root penetration by arbuscular mycorrhizal (AM) fungi are unknown and investigations are hampered by the lack of transformation systems for these unculturable obligate biotrophs. Early steps of host infection by hemibiotrophic fungal phytopathogens, sharing common features with those of AM fungal colonization, depend on the transcription factor STE12.* • Using degenerated primers and rapid amplification of cDNA ends, we isolated the full-length cDNA of an STE12-like gene, GintSTE, from Glomus intraradices and profiled GintSTE expression by real-time and in situ RT-PCR. GintSTE activity and function were investigated by heterologous complementation of a yeast ste12Δ mutant and a Colletotrichum lindemuthianum clste12Δ mutant.* • Sequence...
Tipo: Journal Article Palavras-chave: MYCORHIZES ARBUSCULAIRES; GLOMUS INTRARADICES.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201126f1390e&uri=/notices/prodinra1/2011/06/
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Development and activity of Glomus intraradices as affected by co-existence with Glomus claroideum in one root system Inra
Janoušková, M.; Seddas, P.; Mrnka, L.; Van Tuinen, D.; Dvořáčková, A.; Tollot, M.; Gianinazzi-Pearson, V.; Vosátka, M.; Gollotte, A..
The co-existence of two arbuscular mycorrhizal fungal (AMF) species, Glomus intraradices and Glomus claroideum, in the root systems of plants was investigated in a greenhouse experiment aimed at reconstructing interactions during an early stage of primary succession on a coal-mine spoil bank in Central Europe. Two plant species, Tripleurospermum inodorum and Calamagrostis epigejos, were inoculated either with one or both AMF species. Fungal development, determined by trypan blue and alkaline phosphatase staining as well as by PCR amplification of rRNA genes with species-specific primers, and the expression of five genes with different metabolic functions in the intraradical structures of G. intraradices were followed after 6 and 9 weeks of cultivation. The...
Tipo: Journal Article Palavras-chave: MYCORHIZES A ARBUSCULES; PHOSPHATASE ALCALINE; MYCELIUM INTRARADICAL ALKALINE PHOSPHATASE; ARBUSCULAR MYCORRHIZA; GENE EXPRESSION; INTRARADICAL MYCELIUM; NESTED PCR.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20119c7b67f7&uri=/notices/prodinra1/2011/05/
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Plant-driven selection of microbes Inra
Hartmann, A.; Schmid, M.; Van Tuinen, D.; Berg, G..
The rhizodeposition of plants dramatically influence the surrounding soil and its microflora. Root exudates have pronounced selective and promoting effects on specific microbial populations which are able to respond with chemotaxis and fast growth responses, such that only a rather small subset of the whole soil microbial diversity is finally colonizing roots successfully. The exudates carbon compounds provide readily available nutrient and energy sources for heterotrophic organisms but also contribute e.g. complexing agents, such as carboxylates, phenols or siderophores for the mobilization and acquisition of rather insoluble minerals. Root exudation can also quite dramatically alter the pH- and redox-milieu in the rhizosphere. In addition, not only...
Tipo: Journal Article Palavras-chave: EXSUDATION RACINAIRE; RHIZODEPOSITION; DIVERITE MICROBIENNE; MYCORHIZES A ARBUSCULES; ANTIMICROBIEN ROOT EXUDATION; RHIZODEPOSITION; MICROBIAL DIVERSITY; RHIZOSPHERE BACTERIA; MYCORRHIZAL FUNGI; ARBUSCULAR MYCORRHIZA; ECTOMYCORRHIZA; ANTIMICROBIALS; SIGNALLING COMPOUNDS; PLANT GROWTH PROMOTION; BIOLOGICAL CONTROL; "BIASED RHIZOSPHERE CONCEPT".
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011720427a9&uri=/notices/prodinra1/2011/05/
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Preferential colonization of Solanum tuberosum L. roots by the fungus Glomus intraradices in arable soil of a potato farming area Inra
Cesaro, P.; Van Tuinen, D.; Copetta, A.; Chatagnier, O.; Berta, G.; Gianinazzi, S.; Lingua, G..
The symbiosis between plant roots and arbuscular mycorrhizal (AM) fungi has been shown to affect both the diversity and productivity of agricultural communities. In this study, we characterized the AM fungal communities of Solanum tuberosum L. (potato) roots and of the bulk soil in two nearby areas of northern Italy, in order to verify if land use practices had selected any particular AM fungus with specificity to potato plants. The AM fungal large-subunit (LSU) rRNA genes were subjected to nested PCR, cloning, sequencing, and phylogenetic analyses. One hundred eighty-three LSU rRNA sequences were analyzed, and eight monophyletic ribotypes, belonging to Glomus groups A and B, were identified. AM fungal communities differed between bulk soil and potato...
Tipo: Journal Article Palavras-chave: CHAMPIGNON MYCORHIZIEN ARBUSCULAIRE; GLOMUS INTRARADICES.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20116d5da732&uri=/notices/prodinra1/2011/05/
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Stimulation of Defense Reactions in Medicago truncatula by Antagonistic Lipopeptides from Paenibacillus sp. Strain B2 Inra
Selim, S.; Negrel, J.; Wendehenne, D.; Ochatt, S.; Van Tuinen, D..
With the aim of obtaining new strategies to control plant diseases, we investigated the ability of antagonistic lipopolypeptides (paenimyxin) from Paenibacillus sp. strain B2 to elicit hydrogen peroxide (H2O2) production and several defense-related genes in the model legume Medicago truncatula. For this purpose, M. truncatula cell suspensions were used and a pathosystem between M. truncatula and Fusarium acuminatum was established. In M. truncatula cell cultures, the induction of H2O2 reached a maximum 20 min after elicitation with paenimyxin, whereas concentrations higher than 20 µM inhibited H2O2 induction and this was correlated with a lethal effect. In plant roots incubated with different concentrations of paenimyxin for 24 h before inoculation...
Tipo: Journal Article Palavras-chave: LIPOPEPTIDE MEDICAGO TRUNCATULA; PANIBACILLUS SP. STRAIN B2.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201175a49d98&uri=/notices/prodinra1/2011/05/
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Symbiosis-related pea genes modulate fungal and plant gene expression during the arbuscule stage of mycorrhiza with Glomus intraradices Inra
Kuznetsova, E.; Seddas-Dozolme, P.; Tollot, M.; Van Tuinen, D.; Borisov, A.; Gianinazzi, S.; Gianinazzi-Pearson, V..
The arbuscular mycorrhiza association results from a successful interaction between genomes of the plant and fungal symbiotic partners. In this study, we analyzed the effect of inactivation of late-stage symbiosis-related pea genes on symbiosis-associated fungal and plant molecular responses in order to gain insight into their role in the functional mycorrhizal association. The expression of a subset of ten fungal and eight plant genes, previously reported to be activated during mycorrhiza development, was compared in Glomus intraradices-inoculated wild-type and isogenic genotypes of pea mutated for the PsSym36, PsSym33, and PsSym40 genes where arbuscule formation is inhibited or fungal turnover modulated, respectively. Microdissection was used to...
Tipo: Journal Article Palavras-chave: MYCORHIZES A ARBUSCULES; GLOMUS INTRARADICES.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011268ce933&uri=/notices/prodinra1/2011/05/
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Symbiosis-related plant genes modulate molecular responses in an arbuscular mycorrhizal fungus during early root interactions Inra
Seddas, P.M.A.; Arias, M.C.; Arnould, C.; Van Tuinen, D.; Godfroy, O.; Aït Benhassou, H.; Gouzy, J.; Morandi, D.; Dessaint, F.; Gianinazzi-Pearson, V..
To gain further insight into the role of the plant genome in arbuscular mycorrhiza (AM) establishment, we investigated whether symbiosis-related plant genes affect fungal gene expression in germinating spores and at the appressoria stage of root interactions. Glomus intraradices genes were identified in expressed sequence tag libraries of mycorrhizal Medicago truncatula roots by in silico expression analyses. Transcripts of a subset of genes, with predicted functions in transcription, protein synthesis, primary or secondary metabolism, or of unknown function, were monitored in spores and germinating spores and during interactions with roots of wild-type or mycorrhiza-defective (Myc–) mutants of M. truncatula. Not all the fungal genes were active in...
Tipo: Journal Article Palavras-chave: ARBUSCULAR MYCORRHIZAL FUNGUS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201131e440a3&uri=/notices/prodinra1/2011/05/
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Transcription of two blue copper-binding protein isogenes is highly correlated with arbuscular mycorrhizal development in Medicago truncatula Inra
Paradi, I.; Van Tuinen, D.; Morandi, D.; Ochatt, S.; Robert, F.; Jacas, L.; Dumas-Gaudot, E..
Expression profiling of two paralogous arbuscular mycorrhizal (AM)-specific blue copper-binding gene (MtBcp1a and MtBcp1b) isoforms was performed by real-time quantitative polymerase chain reaction in wild-type Medicago truncatula Jemalong 5 (J5) during the mycorrhizal development with Glomus intraradices for up to 7 weeks. Time-course analysis in J5 showed that expression of both MtBcp1 genes increased continuously and correlated strongly with the colonization intensity and arbuscule content. MtPT4, selected as a reference gene of the functional plant-fungus association, showed a weaker correlation to mycorrhizal development. In a second experiment, a range of mycorrhizal mutants of the wild-type J5 was assessed. Strictly AM-penetration-defective TRV25-C...
Tipo: Journal Article Palavras-chave: MYCRORHIZE ARBUSCULAIRE MEDICAGO TRUNCATULA; GLOMUS INTRARADICES.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011ff079437&uri=/notices/prodinra1/2011/05/
Registros recuperados: 8
Primeira ... 1 ... Última
 

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