Biotransformation of viridin, an antifungal produced by biocontrol agent, with non-viridin producing microorganisms is studied. The results show that some environmental non-targeted microorganisms are able to reduce it in the known phytotoxin viridiol, and its 3-epimer. Consequently, this reduction, which happens in some cases by detoxification mechanism, could be disastrous for the plant in a biocontrol of plant disease. However, a process fermentation/biotransformation could be an efficient approach for the preparation of this phytotoxin.
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Bioconversion of antifungal viridin to phytotoxin viridiol by environmental non-viridin producing microorganisms.
Bioorg Chem
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Laboratoire Molécules de Communication et Adaptation des Micro-organismes (MCAM), Muséum national d'Histoire naturelle, CNRS; CP54, 57 Rue Cuvier, 75005 Paris, France. Electronic address:
Biotransformation of viridin, an antifungal produced by biocontrol agent, with non-viridin producing microorganisms is studied. The results show that some environmental non-targeted microorganisms are able to reduce it in the known phytotoxin viridiol, and its 3-epimer. Consequently, this reduction, which happens in some cases by detoxification mechanism, could be disastrous for the plant in a biocontrol of plant disease.
View Article and Find Full Text PDFHyfraxinic Acid, a Phytotoxic Tetrasubstituted Octanoic Acid, Produced by the Ash ( L.) Pathogen Together with Viridiol and Some of Its Analogues.
J Agric Food Chem
December 2019
Dipartimento Scienze Chimiche , Università di Napoli Federico II , Complesso Universitario Monte S. Angelo, Via Cintia 4 , 80126 Napoli , Italy.
A new tetrasubstituted octanoic acid, named hyfraxinic acid (), was isolated together with known 1-deoxyviridiol (), viridiol (), nodulisporiviridin M (), and demethoxyviridiol () from the organic extract of responsible for ash ( L.) dieback in Europe. Hyfraxinic acid () was characterized, using spectroscopic methods, as 2,4-dihydroxy-7-methyl-6-methyleneoctanoic acid.
View Article and Find Full Text PDFGenotypes of Fraxinus excelsior with different susceptibility to the ash dieback pathogen Hymenoscyphus pseudoalbidus and their response to the phytotoxin viridiol - a metabolomic and microscopic study.
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June 2014
Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Almas allé 5, PO Box 7026, SE-750 07 Uppsala, Sweden.
Eight European ash (Fraxinus excelsior) genotypes with different known susceptibility to Hymenoscyphus pseudoalbidus were tested against the phytotoxin viridiol and their response described at the microscopic and metabolomic level. All ash genotypes were sensitive to the toxin and necrosis was detectable after 24h. Among the three viridiol concentrations used in the experiment, the lowest concentration (14.
View Article and Find Full Text PDFStructure reassignment of the fungal metabolite TAEMC161 as the phytotoxin viridiol.
J Nat Prod
May 2003
Department of Chemistry, University of Pittsburgh, Pennsylvania 15260, USA.
Two-dimensional NMR analyses including HMBC, NOESY, and ROESY as well as 1D NOE experiments led to a reassignment of the structure of the recently identified Trichoderma hamatum metabolite TAEMC161 (1) as the previously known viridiol (2). In addition, GIAO-calculated (13)C NMR chemical shifts of 1 and 2 provided strong support for the revised structure.
View Article and Find Full Text PDFConversion of viridin to viridiol by viridin-producing fungi.
Can J Microbiol
November 1987
Department of Plant Pathology, University of California, Berkeley 94720.
The fungistatic compound viridin, produced by the fungus Gliocladium virens, was found to be irreversibly reduced to the phytotoxin viridiol in liquid culture. Conversion occurred only in the presence of viridin-producing fungi and was subsequent to viridin production. Radiolabelled viridin was rapidly taken up by the mycelium of G.
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