Vinsamlegast notið þetta auðkenni þegar þið vitnið til verksins eða tengið í það: http://hdl.handle.net/1946/19712
Potato blight, caused by the Phytophthora infestans (Mont.) de Bary, is one of the most devastating potato diseases (Schepers 2000), causing serious problems in countries with high relative humidity, cool nights and warm days in summer. Damaged potato foliage reduces the assimilation surface which results in reduced yield. Resistance to the blight is controlled by major R genes and an unknown number of genes expressing quantitative parameters of the resistance (Lara et al. 2006). Solanum demissum is characterized by the highest efficiency of polygenes (Ballvora et al. 2012). Resistance of potato varieties to P. Infestans is one of the most important breeding objectives. Potato varieties relatively resistant to P. infestans have been developed, but their resistance may weaken due to changes in pathogen race composition. Furthermore, as only a limited gene pool is used for breeding for potato blight resistance, the disease can affect large groups of varieties at the same time in different years. According to Hansen et al. (2005), in Europe, varieties initially classified as resistant are being severely infected by the disease as a result of shifts in pathogen populations.
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