A pathotype (i.e., strain, or race) of a parasite which has been chosen for use in the one-pathotype technique in a horizontal resistance breeding program. The designated pathotype is cultured on the designated host for the entire duration of the breeding program. All the original parents of the breeding population are chosen on the basis of their susceptibility to the designated pathotype, which is used to inoculate every screening population. This will ensure that all vertical resistances are matched during the screening for horizontal resistance, regardless of how the vertical resistance genes may have recombined during the breeding process. Only one designated pathotype may be chosen for each species of parasite. The one pathotype technique is necessary only when vertical resistances occur in the host species. However, its use is not always necessary, even then, and alternative techniques exist. Consult a specialist or see Self-Organising Crop Improvement (shareware at this website) for further information).
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