Abstract
The objective of the present research was to introduce genes with antifungal potential into the commercially important apple cvs. Elstar and Holsteiner Cox in order to establish resistance against fungal diseases. The gene encoding the stilbene synthase (Vst1) from Vitis vinifera L., responsible for the synthesis of the phytoalexin resveratrol in grapevine, and the gene for a polygalacturonase-inhibiting protein (PGIP) from kiwi ( Actinidia deliciosa) were transferred into Holsteiner Cox and Elstar via Agrobacterium tumefaciens-mediated transformation. A total of nine transgenic Holsteiner Cox clones and one transgenic E clone carrying the stilbene-synthase gene as well as three transgenic Holsteiner Cox lines harbouring the polygalacturonase-inhibiting protein from Kiwi were identified via polymerase chain reaction and Southern blot analysis. High performance liquid chromatography analysis revealed the accumulation of a resveratrol-derivate, a glycoside, in transgenic Vst1 plants.
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