Characterization of viral agents present in tomato crops in Arica and Parinacota Region of Northern Chile
In Arica and Parinacota Region, the Azapa valley is the main tomato producer for fresh consumption. In last years, due to fluctuating climatic conditions presented in this region, a series of viral diseases were detected which, according to estimates in the field, have a high impact on production. T...
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| Format: | doctoral thesis |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/249760 |
| Online Access: | https://hdl.handle.net/10533/249760 |
| Access Level: | Open access |
| Keyword: | Ciencias Agrícolas Otras Ciencias Agrícolas |
| Summary: | In Arica and Parinacota Region, the Azapa valley is the main tomato producer for fresh consumption. In last years, due to fluctuating climatic conditions presented in this region, a series of viral diseases were detected which, according to estimates in the field, have a high impact on production. The objective of this research was to determine the prevalence and geographical distribution of three emerging virus diseases: Tomato yellow vein streak virus (TYVSV), Peru tomato virus (PTV) and Tomato leaf deformation virus (ToLDeV), present in tomato in this region and to characterize the symptomatology and genome. The results showed the three viruses studied were founded in single and multiple infection, being the begomoviruses TYVSV and ToLDeV those that presented the highest prevalence. In the case of PTV, the biological characterization of one new isolates of PTV collected in tomato crop in Azapa valley was described. In other hand, through this study it was determine the first report of Southern tomato virus STV, and correspond to the first identification this virus affecting tomatoes in South America. Finally, in this research report a resistance-breaking isolate of Tomato spotted wilt virus TSWV infecting resistant pepper cultivars in the north of Chile. Key words: Arica and Parinacota region, Tomato yellow vein streak virus, Tomato leaf deformation virus, Peru tomato virus, prevalence, molecular characterization, Southern tomato virus, resistance-breaking |
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