期刊
VIROLOGY
卷 303, 期 2, 页码 317-326出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/viro.2002.1633
关键词
begomovirus; Bemisia tabaci transmission; field survey geminivirus; host range; Lycopersicon esculentum; Phaseolus vulgaris; natural recombination; Tomato yellow leaf curl disease
类别
This work provides evidence of the significant contribution of recombination to the genetic diversification of emerging begomovirus populations. In southern Spain, Tomato yellow leaf curl Sardinia virus (TYLCSV) and Tomato yellow leaf curl virus (TYLCV) are distinct geminivirus species that coexist in the field and contribute to the tomato yellow leaf curl disease epidemic. A natural recombinant between TYLCSV and TYLCV has been detected and an infectious clone of a recombinant isolate (ES421/99) was obtained and characterized. Analysis of its genome showed that the recombination sites are located in the intergenic region in which a conserved stem-loop structure occurs and at the T-end of the replication enhancer protein open reading frame. ES421/99 exhibited a hovel pathogenic phenotype that might provide it With a selective advantage over the parental genotypes. This agrees with results from field studies which revealed that the recombinant strain is becoming prevalent in the region in which it was detected. (C) 2002 Elsevier Science (USA).
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