Efforts to clone the gene(s) responsible for strong field resistance in cv. ![]() demissum in both diploid and tetraploid populations of potato. We have previously mapped QTLs for field resistance to P. New lineages of the A2 mating type appear to be more aggressive and overcome previously strong sources of resistances. infestans populations is currently being observed in many European potato growing regions, including the UK. infestans populations are highly adaptable and have the ability to evolve quite rapidly. ![]() Breeding for resistance is challenging as P. Current management practices rely heavily on multiple fungicide applications (up to 20 per season) for disease control. Late blight, caused by the oomycete pathogen Phytophthora infestans, is the most devastating potato disease and outbreaks can have global impacts as, for example, seen during the Irish potato famine in 1845-1846 (Figure 1, below). Information concerning pathogen population changes are integrated into our work, allowing us to assess the potential durability of the sources of resistance with which we work. We work in close collaboration with plant pathology colleagues. ![]() Using a combination of genetic and genomics approaches, our aim is to characterise resistance loci, develop markers suitable for marker-assisted breeding and, ultimately, to clone the genes responsible for resistance. This programme has provided parents for commercially funded breeding of finished cultivars and has delivered cultivars for various potato markets, such as Lady Balfour for organic production. Since 1989 the Institute has conducted a multitrait (MT) pre-breeding programme to combine disease resistances with quality traits required for modern potato cultivars. Currently, multidisciplinary research at the James Hutton Institute focuses mainly on identifying and understanding resistance to the major pathogens of potato, such as late blight, caused by the oomycete pathogen Phytophthora infestans, and potato cyst nematodes (PCN). Currently, multidisciplinary research at the James Hutton Institute focuses mainly on identifying and understanding resistance to the major pathogens of potato, such as late blight and potato cyst nematodes.Ĭultivated potatoes are constantly exposed to various pathogens that, if successful in overcoming the plant’s defences, pose a serious threat to production.
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