Identification of the vertical genes

It is not necessary to know which vertical resistance genes are present in the designated host and pathotype. The only things that matter are (i) that there is only one designated pathotype of each species of parasite, (ii) that all the original parents of the screening population are susceptible to that designated pathotype, and (iii) that the designated pathotype is used to inoculate every screening population.

However, if the identity of the vertical genes is known, and this information is readily available, a designated host with many vertical resistance genes is preferable to one with only a few genes. This is because a designated host with many genes will permit a wider range of original parents.

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