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Development of Potato Cyst-Nematodes in Roots of Resistant Solanum Tuberosum Ssp. Andigena and S. Vernei Hybrids

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For more content, see Nematology.

Development of potato cyst-nematodes in roots of resistant potato plants was studied using a technique which confined invasion to a limited portion of the root system. Comparisons were made between development in plants with the major resistance gene H1 derived from Solanum tuberosum ssp. andigena, plants with polygenic resistance derived from S. vernei, and a susceptible cultivar. One population of Globodera rostochiensis pathotype Ro1 and one of G. pallida pathotype Pa3 were used, with development in roots observed until 37 d after inoculation. Numbers of juveniles invading root systems were not clearly related to resistance but in all combinations of potato and nematode where resistance was found there was a decrease in rate of nematode development which varied in degree but occurred with both types of resistance. This appears to be the main effect of resistance on nematode multiplication. These findings are discussed in relation to earlier reported work on partial resistance.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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