A GLASSHOUSE TEST FOR DETECTING RESISTANCE OF PLUM GENOTYPES TO PLUM POX VIRUS

21 plum cultivars and hybrids were investigated by double grafting in the glasshouse concerning their symptom expression and PPV concentration.

Highly susceptible and more or less quantitative resistant genotypes showed leaf mottling and were proved also highly susceptible to natural infection by aphids in the field.

Genotypes classified as highly quantitative resistant to and possibly immune from PPV mostly showed no leaf symptoms.
Natural infections in the field have not been detected after 5 years.

Hypersensitive genotypes showed tip necrosis or necrotic leaf spotting after double grafting and were also not infected in the field within 5 years.

Genotypes of the highly susceptible group achieved mostly higher values in ELISA than genotypes of the second group.
The extinction values of the hypersensitive genotypes differed rather strongly in dependence on the strength of necrosis.

Double grafting seems to be a suitable method for a fast detecting of hypersensitivity to PPV in plum genotypes.

V International Symposium on Plum and Prune Genetic, Breeding and Pomology

H. Kegler, M. Grüntzig, E. Fuchs

https://doi.org/10.17660/ActaHortic.1994.359.22