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

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Pre-breeding for quantitative resistance of potato to late blight at the Institute of Agricultural Crops Groß Lüsewitz focuses on developing durable, polygenic resistance to Phytophthora infestans. This approach contrasts with the simpler, race-specific hypersensitivity that often fails before new resistance genes can be integrated into potato cultivars. The study reveals that polygenic resistance is present in some progeny, diminishing with the distance from wild species. It highlights the need for improved assessment methods and adjustments in breeding practices, as international standards have not been consistently met, resulting in a lack of significant progress in utilizing blight resistance. This has led to an unjustified neglect of quantitative resistance. The findings demonstrate that this form of resistance can coexist with desirable potato traits, including earliness and quality, challenging existing scientific and breeding assumptions. The continuation of pre-breeding efforts is justified by its potential benefits for environmental and consumer protection, the current global shortage of resistant breeding materials, the competitive edge it could provide to German breeders, its role in sustainable agriculture, the need to preserve genetic diversity, and the demand for suitable potato varieties for research in Germany.