Functional degeneration of the resistance gene nsv against Melon necrotic spot virus at low temperature
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Abstract
The single recessive gene, nsv, which confers resistance against Melon necrotic spot virus (MNSV), has recently been used to develop virus-resistant melon cultivars in Japan. However, the Chiba isolate of MNSV, a common isolate in Japan, infected resistant cultivars when inoculated melon plants were grown at 15°C. Viral RNAs accumulated in protoplasts from resistant cultivars at both 15 and 20°C. Mechanical inoculation of the cotyledons caused MNSV to spread throughout the leaves at 15°C, but not at 20°C. These results support our novel hypothesis that a temperature-sensitive inactivation of disease resistance genes occurs at the nsv locus in melon cultivars with the resistance gene grown at temperatures below 20°C.
Keywords
Cell-to-cell movement Methyl bromide Olpidium bornovanus Protoplast Recessive resistance Viral replicationAbbreviations
- DAS-ELISA
double-antibody sandwich enzyme-linked immunosorbent assay
- dpi
days post-inoculation
- eIF4E
eukaryotic initiation factor 4E
- hpi
hours post-inoculation
- IgG
immunoglobulin G
- MNSV
Melon necrotic spot virus
- PBS
phosphate-buffered saline
- USDA-ARS
United States Department of Agriculture Agricultural Research Station
- UTR
untranslated region
Notes
Acknowledgements
We are grateful to T. Meshi for helpful comments and discussion. We also thank L.M. Knight for critical reading of this manuscript. This study was supported, in part, by a Grant-in-Aid as part of The Research Project for Utilizing Advanced Technologies in Agriculture, Forestry and Fisheries administered by the Ministry of Agriculture, Forestry and Fisheries in Japan.
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