ISHS Acta Horticulturae 695: I International Symposium on Tomato Diseases
EFFICIENCY OF POT-1 MEDIATED RESISTANCE IN LYCOPERSICON HIRSUTUM PI 247087 TOWARDS ITALIAN PVY ISOLATES |
| Authors: | A. Fanigliulo, S. Comes, G. Parrella, R. Pacella, A. Crescenzi |
| Keywords: | Potato virus Y, resistance, pot-1, Lycopersicon hirsutum, PI 247087 |
| Abstract:
Potato virus Y (PVY) is widespread in Italian tomato crops, often causing serious yield and quality losses. The use of genetic resistance is considered the best strategy to control the virus so far. The recessive pot-1 gene from the tomato wild relative Lycopersicon hirsutum PI 247087 controls PVY accumulation in inoculated leaves. Nevertheless, a virulent strain able to overcome the pot-1 mediated resistance, carrying a single aminoacidic change in the viral protein genome-linked (VPg), has been recently described. In order to evaluate the resistance stability to PVY, seventeen PVY Italian isolates from tomato, pepper and wild species have been recovered in the main tomato growing areas of Italy. They have been used in mechanical inoculation tests on the resistant PI 247087 accession and on a susceptible tomato line and have been checked weekly by back inoculation on herbaceous hosts and by DAS-ELISA for virus presence and symptoms development, both in inoculated and upper, non-inoculated leaves. None of the tested PVY isolates was detected in PI 247087 inoculated leaves, whereas high levels of virus accumulation were detected in tomato susceptible lines. Results clearly indicate the efficiency of pot-1 mediated resistance to PVY towards a collection of PVY Italian isolates, an interesting aspect to take into account in the constitution of tomato varieties for Italian cultivations. | |
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