A naturally occurring recombinant DNA-A of a typical bipartite begomovirus does not require the cognate DNA-B to infect Nicotiana benthamiana systemically
| Autor: | P. F. Alfenas, Rafaelo M. Galvão, Francisco Murilo Zerbini, Andrea C. Mariano, Elizabeth P. B. Fontes, Márcia Rogéria de Almeida, Eduardo C. Andrade, Dirce F. Luz |
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| Rok vydání: | 2003 |
| Předmět: |
Sequence analysis
Molecular Sequence Data Nicotiana benthamiana Genome Virus law.invention chemistry.chemical_compound DNA-A DNA-B Solanum lycopersicum Species Specificity law Virology Tobacco Cloning Molecular Virus classification Phylogeny Recombination Genetic biology Base Sequence Begomovirus food and beverages Sequence Analysis DNA biology.organism_classification Geminiviridae chemistry DNA Viral Recombinant DNA Sequence Alignment DNA Brazil |
| Zdroj: | LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV |
| ISSN: | 0022-1317 |
| Popis: | Species of the genusBegomovirus(familyGeminiviridae) found in the western hemisphere typically have a bipartite genome that consists of two 2·6 kb DNA genomic components, DNA-A and DNA-B. We have identified and cloned genomic components of a new tomato-infecting begomovirus from Brazil, for which the name Tomato crinkle leaf yellows virus (TCrLYV) is proposed, and a DNA-A variant of Tomato chlorotic mottle virus (ToCMV-[MG-Bt1]). Sequence analysis revealed that TCrLYV was most closely related to ToCMV, although it was sufficiently divergent to be considered a distinct virus species. Furthermore, these closely related viruses induce distinguishable symptoms in tomato plants. With respect to ToCMV-[MG-Bt1] DNA-A, evidence is presented that suggests a recombinant origin. It possesses a hybrid genome on which the replication compatible module (AC1 and replication origin) was probably donated by ToCMV-[BA-Se1] and the remaining sequences appear to have originated from Tomato rugose mosaic virus (ToRMV). Despite the high degree of sequence conservation with its predecessors, ToCMV-[MG-Bt1] differs significantly in its biological properties. Although ToCMV-[MG-Bt1] DNA-A did not infect tomato plants, it systemically infectedNicotiana benthamiana, induced symptoms of mottling and accumulated viral DNA in the apical leaves in the absence of a cognate DNA-B. The modular rearrangement that resulted in ToCMV-[MG-Bt1] DNA-A may have provided this virus with a more aggressive nature. Our results further support the notion that interspecies recombination may play a significant role in geminivirus diversity and their emergence as agriculturally important pathogens. |
| Databáze: | OpenAIRE |
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