Ulrich Darsow Pořadí knih

This work explores the pre-breeding and breeding of potatoes for quantitative resistance to Phytophthora infestans affecting both foliage and tubers, addressing challenges, solutions, and outcomes. The pursuit of late blight resistance has revealed the complexities of quantitative resistance, which is difficult to assess and progress in due to polygenic inheritance and the lengthy breeding process involving wild species as resistance sources. While R-genes offer immediate resistance, quantitative resistance is more durable. However, economic and methodological challenges have hindered breeding efforts, with chemical protection often seen as a viable alternative, though breeding could reduce its use by a third. Over 40 years of pre-breeding at ZL Gross Luesewitz has led to new methods and breeding materials, necessitating a reevaluation of the value of quantitative resistance and its integration with other traits. The slow progress in combining resistance with these traits highlights the need for changes in selection systems to enhance breeding efficiency. The research also analyzes P. infestans pathogenicity, global resistance levels, and the factors contributing to inadequate resistance. Comprehensive methodologies for assessing blight resistance and the utilization of wild species are discussed, supported by extensive references. The document concludes with insights into the future application of quantitative late blight res

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.