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Host Ranges of Globodera Species Within Solanum Subgenus Leptostemonum

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For more content, see Nematology.

Host ranges of 35 populations of Globodera spp. from the Americas and pathotypes from Europe were tested on 19 Solanum subgenus Leptostemonum spp. representing different taxonomic sub-groupings and geographical distributions. Cluster and principal co-ordinate analyses showed intraspecific variation in all Globodera spp. except G. tabacum. European populations of pathotypes Ro1 to Ro5 and Pa2 had smaller host ranges than populations of Globodera from the Americas and hypotheses are advanced to explain the phenomenon. North and Central American Globodera spp. could not be differentiated; similarities between populations of different species were often equal to or greater than those within the same species. G. airginiae and the "Mexican cyst-nematode" were most similar followed by G. solanacearum and G. tabacum. G. pallida and G. rostochiensis were more distinct. The pattern of resistance did not correspond directly to taxonomic sub-groupings of Leptostemonum as sections, e. g. Acanthophora and Lasiocarpa, contained resistant and susceptible species. A closer correspondence was found with geographical distribution of solanums; indigenous Old World species with little or no exposure to Globodera were uniformly susceptible, whereas resistance was found in indigenous American solanums likely to have been in contact with Globodera. The hypothesis is advanced that susceptibility is the basic condition in Solanum and that resistance has been selected in response to nematode attack, circumvention of resistance subsequently arising in some Globodera populations.

Affiliations: 1: Nematology Department, Rothamsted Experimental Station, Harpenden, Herts


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