Rôle déterminant des stilbènes dans la résistance au mildiou de la vigne
作者： Francine Voinesco , Katia Gindro , Olivier Viret , Virginia Alonso-Villaverde Iglesias , Jean-Laurent Spring
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摘要: Des feuilles de differents cepages vigne (Vitis vinifera L.), sensibles (Chasselas) ou resistants au mildiou (Solaris et 2091), ainsi que d'une espece immune (Muscadinia rotundifolia) ont ete infectees avec du (Plasmopara viticola). Les echantillons analyses par differentes methodes microscopiques evalues quant a leur capacite synthetiser des composes toxiques pour le (phytoalexines stilbeniques), specifiquement aux sites infections. Sur Chasselas, les resultats montre produit structures d'infections fonctionnelles (haustoria) peut achever son cycle developpement. En effet, ce cepage sensible ne synthetise la piceide, molecule non toxique mildiou. Par contre, developpement est interrompu sur resistants. Solaris 2091, l'arret intervient apres formation d'haustoria, correle forte production respectivement δ-viniferine pterostilbene localisee sous gouttes d'infection. Chez Muscadine, bloque deja moment penetration (pas formations d'haustoria fonctionnels). La stilbenes se fait exactement d'infection, concentrations moins vingt fois superieures celles decrits precedemment. Le role essentiel dans resistance Vitis spp. discute.
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