Molecular characterization of a begomovirus associated with tomato leaf curl disease in Uganda
During the summer of 2003, leaf curl symptoms were observed in tomato (Lycopersicon esculentum) plantings in the Iganga District of Uganda. Begomoviral infection was suspected. Twelve symptomatic samples were collected. Begomoviral DNA was extracted and amplified using polymerase chain reaction (PCR...
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Published in | Plant disease Vol. 90; no. 2; p. 246 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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United States
01.02.2006
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Abstract | During the summer of 2003, leaf curl symptoms were observed in tomato (Lycopersicon esculentum) plantings in the Iganga District of Uganda. Begomoviral infection was suspected. Twelve symptomatic samples were collected. Begomoviral DNA was extracted and amplified using polymerase chain reaction (PCR) with the begomovirus-specific degenerate primer pair PAL1v1978/PAR1c715 (4). The expected 1.4-kb PCR products were obtained from 11 of 12 samples. The 1.4-kb PCR product of one of the samples was cloned and sequenced. Based on the sequence of the 1.4-kb DNA product, specific primers were designed to complete the DNA-A sequence. The DNA-A consisted of 2,747 nucleotides (GenBank Accession No. DQ127170) and was found to contain seven predicted open reading frames (ORFs V1, V2, C1, C2, C3, C4, and C5). A BLAST analysis was conducted with geminivirus sequences available in the GenBank database at the National Center for Biotechnology Information (Bethesda, MD), and MegAlign (DNASTAR, Inc, Madison, WI) software was used for further comparisons. The DNA-A sequence of the virus associated with leaf curl of tomato from Uganda showed less than 79% sequence identity with cassava mosaic viruses from Uganda (GenBank/EMBL Accession Nos. AF126800, AF126802, AF126804, AF126806, and Z83257), the only begomoviruses from the country so far in the public domain. Highest sequence identity (83%) was with Tomato leaf curl Mayotte virus from Dembeni, Mayotte, Comoros Islands (ToLCYTV-[Dem], EMBL Accession No. AJ865341). Pairwise comparison with ToLCYTV-[Dem] showed 60, 88, 91, 82, 84, 86, and 80% sequence identities in the intergenic region, V2, V1, C1, C2, C3, and C4 ORFs, respectively. Only low sequence identities (ranging from 71 to 82%) were obtained with other tomato bego-moviruses reported from Africa (GenBank/EMBL Accession Nos. AF261885, AJ865337-AJ865340, AY044137-AY044139, AY502934, AY502936, AY594174, AY736854, and U73498). There was no evidence for the presence of DNA-B or DNA-beta using PCR with the DNA-B specific primer pairs DNABLC1/DNABLV2 and DNABLC2/DNABLV2 (2) and the DNA-beta primer pair Beta01/Beta02 (1), respectively. Detection of possible recombination was by RDP2 software (3) using DNA-A sequences of begomoviruses from Uganda and tomato begomoviruses from Africa. The DNA-A was found to contain a small recombinant fragment from ToLCYTV-[Dem] in the 411 to 969 nucleotide position with 92% sequence identity. Based on DNA-A sequence comparisons, the tomato leaf curl virus from Uganda most likely constitutes a distinct new begomovirus. References: (1) R. W. Briddon et al. Mol. Biotechnol. 20:315, 2002. (2) S. K. Green et al. Plant Dis. 85:1286, 2001. (3) D. P. Martin et al. Bioinformatics 21:260, 2005. (4) M. R. Rojas et al. Plant Dis.77:340, 1993. |
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AbstractList | During the summer of 2003, leaf curl symptoms were observed in tomato (Lycopersicon esculentum) plantings in the Iganga District of Uganda. Begomoviral infection was suspected. Twelve symptomatic samples were collected. Begomoviral DNA was extracted and amplified using polymerase chain reaction (PCR) with the begomovirus-specific degenerate primer pair PAL1v1978/PAR1c715 (4). The expected 1.4-kb PCR products were obtained from 11 of 12 samples. The 1.4-kb PCR product of one of the samples was cloned and sequenced. Based on the sequence of the 1.4-kb DNA product, specific primers were designed to complete the DNA-A sequence. The DNA-A consisted of 2,747 nucleotides (GenBank Accession No. DQ127170) and was found to contain seven predicted open reading frames (ORFs V1, V2, C1, C2, C3, C4, and C5). A BLAST analysis was conducted with geminivirus sequences available in the GenBank database at the National Center for Biotechnology Information (Bethesda, MD), and MegAlign (DNASTAR, Inc, Madison, WI) software was used for further comparisons. The DNA-A sequence of the virus associated with leaf curl of tomato from Uganda showed less than 79% sequence identity with cassava mosaic viruses from Uganda (GenBank/EMBL Accession Nos. AF126800, AF126802, AF126804, AF126806, and Z83257), the only begomoviruses from the country so far in the public domain. Highest sequence identity (83%) was with Tomato leaf curl Mayotte virus from Dembeni, Mayotte, Comoros Islands (ToLCYTV-[Dem], EMBL Accession No. AJ865341). Pairwise comparison with ToLCYTV-[Dem] showed 60, 88, 91, 82, 84, 86, and 80% sequence identities in the intergenic region, V2, V1, C1, C2, C3, and C4 ORFs, respectively. Only low sequence identities (ranging from 71 to 82%) were obtained with other tomato bego-moviruses reported from Africa (GenBank/EMBL Accession Nos. AF261885, AJ865337-AJ865340, AY044137-AY044139, AY502934, AY502936, AY594174, AY736854, and U73498). There was no evidence for the presence of DNA-B or DNA-beta using PCR with the DNA-B specific primer pairs DNABLC1/DNABLV2 and DNABLC2/DNABLV2 (2) and the DNA-beta primer pair Beta01/Beta02 (1), respectively. Detection of possible recombination was by RDP2 software (3) using DNA-A sequences of begomoviruses from Uganda and tomato begomoviruses from Africa. The DNA-A was found to contain a small recombinant fragment from ToLCYTV-[Dem] in the 411 to 969 nucleotide position with 92% sequence identity. Based on DNA-A sequence comparisons, the tomato leaf curl virus from Uganda most likely constitutes a distinct new begomovirus. References: (1) R. W. Briddon et al. Mol. Biotechnol. 20:315, 2002. (2) S. K. Green et al. Plant Dis. 85:1286, 2001. (3) D. P. Martin et al. Bioinformatics 21:260, 2005. (4) M. R. Rojas et al. Plant Dis.77:340, 1993. |
Author | Tsai, W.S Shih, S.L Ssekyewa, C Green, S.K |
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SubjectTerms | Begomovirus genome host plants pathogen identification plant viruses sequence alignment sequence analysis Solanum lycopersicum var. lycopersicum Tomato leaf curl disease tomatoes viral DNA |
Title | Molecular characterization of a begomovirus associated with tomato leaf curl disease in Uganda |
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