ISHS Acta Horticulturae 386: XVI International Symposium on Fruit Tree Virus diseases
DIFFERENT HOST REACTIONS CAN INVOLVE FIELD RESISTANCE OF PLUM GENOTYPES TO PLUM POX VIRUS |
| Authors: | H. Kegler, E. Fuchs, M. Grüntzig, W. Hartmann |
| Abstract:
Plum genotypes remaining healthy under natural conditions despite a high infection preasure can be designated as field resistant. Mechanisms resulting in this trait may be different and can be due to a defence to the vector as well as to the virus. Different types of resistance to plum pox virus (PPV) were detected after graft inoculation in plums. They can be connected with field resistance so far as the defence mechanisms of the host genotype are directed against the virus. Among 45 plum genotypes investigated over a period of 8 years, 22 (= 48.9 %) were proved field resistant. Experimentally infected trees of the same genotypes reacted partially in a different manner. Graft infected genotypes evaluated as highly resistant or immune and hypersensitive respectively, could be detected as field resistant and virusfree in any case. However, genotypes assessed as moderate resistant or highly susceptible after graft infection were proved field resistant to a lesser part, but mostly as field susceptible. Therefore, experimental testing of plum genotypes for PPV resistance has to be checked under natural conditions with a high infection preasure for a longer time. | |
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