Phytophthora infestans potato resistance

Mooi, J.C. (1965). Experiments on testing field resistance to Phytophthora infestans by inoculating cut leaves of potato varieties , European Potato Journal, 8, 182-183. 

Stewart, H. E. (1990). Effect of plant age and inoculum concentration on expression of major gene resistance to Phytophthora infestans in detached potato leaflets , Mycological Research, 94, 823-826. 

Douches, D. S., Bamberg, J. B., Kirk, W., Jastrzebski, K., Niemira, B. A., Coombs, J., Bisognin, D. A., Felcher, K. J. (2001). Evaluation of wild Solanum species for resistance to the US-8 genotype of Phytophthora infestans utilizing a fine-screening teehnique. American Journal of Potato Research, 78, 159-165. 

Zimnoch-Guzowska,E. L.,R.,Kryszczuk, A.,Maciejewska,U., Szczerbakowa, A., Wielgat,B. (2003). Resistance to Phytophthora infestans in somatic hybrids of Solanum nigrum L. and diploid potato. Theoretical and Applied Genetics 107, 43 8. 

Zlesak, D. C., Thill, C. A. (2004). Foliar resistance to Phytophthora infestans (Mont.) de Bary (US-8) in 13 Mexican and South American Solanum species having EBNs of 1, 2, and 4 and implications for breeding. American Journal of Potato Research, 81, 421 29. 

A basic principle in plant pathology is that fungicides are used for crops that lack natural resistance to the fungus involved. Two notorious examples are Phytophthora infestans on potato and Venturia inaequalis on apple. ISfo farmer would go to the labor and expense to spray his potatoes or his apples if he could have plants that successfully fight off their fungi. This principle says further that the amount of fungicide needed or the frequency of application is inversely proportional to natural resistance. 

In phenylamide-resistant strains, phenylamides are not able to inhibit ribosomal RNA synthesis, as is indicated by the inability of metalaxyl to interfere with uridine incorporation in a phenylamide-resistant strain of P. megasperma f. sp. megasperma obtained in the laboratory after mutagenic treatment (14) and a phenylamide-resistant strain of Phytophthora infestans (Table III) originating from a potato field (15). 

Glyco-alkaloids are responsible, at least in part, for the resistance of several other species to various agricultural pests. A t.l.c. system for the quantitative determination of potato glyco-alkaloids has been reported. The enzymic hydrolysis of a-chaconine and a-solanine and the hydrolysis of solanine by the potato blight fungus, Phytophthora infestans, ° have been studied. Techniques for studying the alkaloids of Solanum species have been reviewed. ... 

Cohen, Y., Gisi, U. and Mosinger, E. 1991. Systemic Resistance of Potato Plants Against Phytophthora infestans Induced by Unsaturated Fatty Acids. Physiological and Molecular Plant Pathology. 38 255-263. 

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