Identification of phytotoxins from <Emphasis Type="Italic">Botryosphaeria obtusa</Emphasis>, a pathogen of black dead arm disease of grapevine |
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| Authors: | Jules Désiré Djoukeng Suzanna Polli Philippe Larignon Eliane Abou-Mansour |
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| Institution: | 1.Institute of Biology,University of Neuchatel,Neuchatel,Switzerland;2.Institut Fran?ais de la Vigne et du Vin, Unité Rh?ne-Méditerranée,Domaine de Donadille,Rodilhan,France;3.Plant Biology Department,University of Fribourg,Fribourg,Switzerland |
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| Abstract: | A bioassay-guided fractionation of a culture filtrate of Botryosphaeria obtusa led to the isolation of four dihydroisocoumarins, named mellein 1, 4-hydroxymellein 2, 7-hydroxymellein 3 and the new 4,7-dihydroxymellein
4. LC-UV-DAD-MS analysis of vine wood infected by B. obtusa revealed the presence of mellein (1). Botryosphaeria obtusa was also able to oxidise wood δ
-resveratrol into the dimer delta-viniferin. The structures of isolated phytotoxins were established on the basis of IR, MS, 1D and 2D NMR. |
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| Keywords: | Black dead arm Botryosphaeria obtusa Grapevine disease Isocoumarins Melleins Phytotoxins |
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