Resistances to turnip mosaic potyvirus in Arabidopsis thaliana

The responses of a collection of Arabidopsis thaliana ecotypes to mechanica l inoculation with turnip mosaic potyvirus were assessed. The virus induced characteristic severe symptoms of infection in systemically infected plant s, Resistance was found in four ecotypes: Bay-0, Di-0, Er-0, and Or-0, Enzy me-linked immunosorbent assay results of the resistant ecotypes suggested t hat ecotypes Di-0, Er-0, and Or-0 actually consist of mixed genotypes with resistances acting at different levels in the virus life cycle, Another for m of resistance was found in ecotype Bay-0, for which several lines of evid ence indicated an interference with viral cell-to-cell movement in the inoc ulated leaves.