TABLE CONTENTS

Virulence of Globodera pallida in Relation to Resistance in Potato
Blok, V.C. (1), M.S. Phillips (1), G. Bryan, G. (1) & Dale, F. (1)
(1) Plant Pathology Programme, Scottish Crop Research Institute, Invergowrie, Dundee, Scotland, UK DD2
5DA
Globodera pallida is the most damaging nematode pest to UK agriculture and occurs in many
potato growing regions worldwide. A number of sources of resistance to G. pallida have been
identified in the Commonwealth Potato Collection (CPC) and are used in the potato breeding
program at SCRI. High level resistance from Solanum tuberosum spp. andigena CPC2802
has been introgressed into potato cultivar Vales Everest and the reproduction of many isolates
of G. pallida is greatly reduced on it. Markers are being developed to assist with the
introgression of resistance from CPC2802 and S. vernei and new sources of resistance from
the CPC are also being assessed.
Repeated reproduction of G. pallida populations on potato clones with resistance derived
from Solanum vernei or CPC2802 leads to selection for increased virulence which is specific
to the source of resistance used. Comparisons of several expressed sequences from
populations of G. pallida with differing levels of reproductive ability on clones derived from
S. vernei have revealed a relationship between sequence polymorphisms in chorismate
mutase, and increased virulence.
5 th International Congress of Nematology, 2008 129