Vorlaufzüchtung der Kartoffel auf quantitative Phytophthora-Resistenz im ILK Groß Lüsewitz in der Ressortforschung des BMELV

Pre-breeding for quantitative resistance of potato to late blight at the Institute of Agricultural Crops Groß Lüsewitz in the departmental research of BMELVQuantitative (partial, horizontal, polygenic or relative) resistance of potato foliage to Phytophthora infestans (Mont.) de Bary is the difficult, but durable alternative to the simple inherited race-specific hypersensitivity, which was overcome before a new gene for resistance could be introduced into a new potato cultivar. Polygenic determined resistance occurred in a part of the progeny which decreased with the distance to used wild species. Higher demands on methods of assessment are to consider and changes in breeding methods are necessary. These demands were international not consequently or not fulfilled and good results in using of blight resistance could not be reached. There from unjustified disregard followed for this type of resistance. The given results prove that quantitative blight resistance on foliage and tubers can be combined with all desired traits of potato including earliness and quality. This is just the opposite of the teaching of science and experience of variety breeding. Reason for that is explained in this paper. Continuation of pre-breeding for quantitative late blight resistance of potato in departmental research of BMELV is legitimated by it’s potential contribution to environmental and consumer protection, by the breeding results up till now, by world-wide shortage of blight resistant pre-breeding material and cultivars, by the potential competitive advantage of German breeding enterprises from it, by it’s potential for sustainable agriculture, by necessity to counteract the loss of genes in potato breeding and by the demand on suitable potato material for basic and applied research in Germany.