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Biosynthesis of phytoalexins is a plant defence strategy against pathogens. Shoots of the apple (Malus × domestica) cultivar ‘Holsteiner Cox’ formed biphenyls and dibenzofurans when inoculated with the fire blight bacterium, Erwinia amylovora. The phytoalexins were only present in the transition zone of stems, whereas the leaves were devoid of the defence compounds. The scaffold of the phytoalexins...
In the rosaceous subtribe Pyrinae (formerly subfamily Maloideae), pathogen attack leads to formation of biphenyls and dibenzofurans. Accumulation of these phytoalexins was studied in greenhouse-grown grafted shoots of Malus domestica cv. ‘Holsteiner Cox’ and Pyrus communis cv. ‘Conference’ after inoculation with the fire blight bacterium, Erwinia amylovora. No phytoalexins were found in leaves. However,...
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