Differential reaction of potato hosts to foreign and domestic potato physiologic races of phytophthora infestans
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The potato physiologic races of P. infestans and genes for resistance reported by Black in Scotland, Mastenbroek in the Netherlands, and Mills and Peterson in the United States were found to match or fall into a definite pattern of relationship. Ten distinct isolate groups identified from the reactions of the isolates on the three sets of differential hosts matched the international races 1; 2; 4; 1,2; 1.4; 2,4; 1,2.4; 1,3,4; and 2,3,4. Canadian isolates were identified as races 1,2; 1,2,3; 1,2,4; and 1,2,3,4. One West Virginia isolate was identified as race 3. These 13 different races together with 2 others (1,3 and 3,4) described by Black but not available for study, bring the total number of potato races of P. infestans found to fifteen. Only race 2,3 has not been found from the possible sixteen that can be identified on present differential hosts. The results confirm the interrelationship of genes and races reported in a joint paper by the above four authors. A few isolates gave reactions different from those described for them, but they reacted as one of the other races. Either the cultures were mis-labeled or changed while growing in pure culture. Therefore, the proposed international system of designating potato races of P. infestans and genes for resistance to these races appears to be a valid and workable one for the present.
KeywordsAMERICAN Potato Journal Phytophthora Infestans Potato Jour Physiologic Race Differential Host
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