Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran
| dc.contributor.author | Briddon, Rob W | |
| dc.contributor.author | Heydarnejad, Jahangir | |
| dc.contributor.author | Khosrowfar, Fakhrosadat | |
| dc.contributor.author | Massumi, Hossain | |
| dc.contributor.author | Martin, Darren P | |
| dc.contributor.author | Varsani, Arvin | |
| dc.date.accessioned | 2016-07-26T10:20:37Z | |
| dc.date.available | 2016-07-26T10:20:37Z | |
| dc.date.issued | 2010 | |
| dc.date.updated | 2016-07-26T10:19:23Z | |
| dc.description.abstract | From 2006 onwards turnip crops in Fars province, Iran, have been noted with unusual leaf curling and vein swelling symptoms which are characteristic of the leafhopper-transmitted viruses of the genus Curtovirus (family Geminiviridae). Rolling circle amplification was used to clone viruses from five turnip isolates exhibiting leaf curl symptoms. Analysis of the sequences showed them to have >93% sequence identity and to be distinct from all other geminiviruses previously characterised. Analysis of the sequence of this virus, for which we propose the name Turnip curly top virus (TCTV), showed it to have a genome arrangement in the complementary-sense similar to that of curtoviruses (consisting of four overlapping genes) but only two open reading frames in the virion-sense (the curtoviruses encode three). The complementarysense genes are homologous to those of curtoviruses but show little sequence identity to their curtovirus homologs, with the exception of the product of the C4 open reading frame (ORF) which shows ∼70.6% amino acid sequence identity to the C4 of the North American curtoviruses, Pepper curly top virus and Beet mild curly top virus. For curtoviruses the C4 protein is a symptom determinant, which likely explains the similarity of TCTV symptoms to those of curtoviruses. In the virion-sense the predicted product of the V2 ORF of TCTV shows no significant similarity with any proteins in the databases whereas the product of the V1 ORF (encoding the coat protein [CP] of geminiviruses) shows low levels of sequence identity to the CPs of curtoviruses. These findings show TCTV to be a highly divergent geminivirus with similarities to viruses of the genus curtovirus. The significance of these findings, particularly the taxonomic implications are discussed. | en_ZA |
| dc.identifier | http://dx.doi.org/10.1016/j.virusres.2010.05.016 | |
| dc.identifier.apacitation | Briddon, R. W., Heydarnejad, J., Khosrowfar, F., Massumi, H., Martin, D. P., & Varsani, A. (2010). Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran. <i>Virus Research</i>, http://hdl.handle.net/11427/20753 | en_ZA |
| dc.identifier.chicagocitation | Briddon, Rob W, Jahangir Heydarnejad, Fakhrosadat Khosrowfar, Hossain Massumi, Darren P Martin, and Arvin Varsani "Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran." <i>Virus Research</i> (2010) http://hdl.handle.net/11427/20753 | en_ZA |
| dc.identifier.citation | Briddon, R. W., Heydarnejad, J., Khosrowfar, F., Massumi, H., Martin, D. P., & Varsani, A. (2010). Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran. Virus research, 152(1), 169-175. | en_ZA |
| dc.identifier.issn | 0168-1702 | en_ZA |
| dc.identifier.ris | TY - Journal Article AU - Briddon, Rob W AU - Heydarnejad, Jahangir AU - Khosrowfar, Fakhrosadat AU - Massumi, Hossain AU - Martin, Darren P AU - Varsani, Arvin AB - From 2006 onwards turnip crops in Fars province, Iran, have been noted with unusual leaf curling and vein swelling symptoms which are characteristic of the leafhopper-transmitted viruses of the genus Curtovirus (family Geminiviridae). Rolling circle amplification was used to clone viruses from five turnip isolates exhibiting leaf curl symptoms. Analysis of the sequences showed them to have >93% sequence identity and to be distinct from all other geminiviruses previously characterised. Analysis of the sequence of this virus, for which we propose the name Turnip curly top virus (TCTV), showed it to have a genome arrangement in the complementary-sense similar to that of curtoviruses (consisting of four overlapping genes) but only two open reading frames in the virion-sense (the curtoviruses encode three). The complementarysense genes are homologous to those of curtoviruses but show little sequence identity to their curtovirus homologs, with the exception of the product of the C4 open reading frame (ORF) which shows ∼70.6% amino acid sequence identity to the C4 of the North American curtoviruses, Pepper curly top virus and Beet mild curly top virus. For curtoviruses the C4 protein is a symptom determinant, which likely explains the similarity of TCTV symptoms to those of curtoviruses. In the virion-sense the predicted product of the V2 ORF of TCTV shows no significant similarity with any proteins in the databases whereas the product of the V1 ORF (encoding the coat protein [CP] of geminiviruses) shows low levels of sequence identity to the CPs of curtoviruses. These findings show TCTV to be a highly divergent geminivirus with similarities to viruses of the genus curtovirus. The significance of these findings, particularly the taxonomic implications are discussed. DA - 2010 DB - OpenUCT DP - University of Cape Town J1 - Virus Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2010 SM - 0168-1702 T1 - Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran TI - Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran UR - http://hdl.handle.net/11427/20753 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/20753 | |
| dc.identifier.uri | http://www.sciencedirect.com/science/article/pii/S0168170210001838 | |
| dc.identifier.vancouvercitation | Briddon RW, Heydarnejad J, Khosrowfar F, Massumi H, Martin DP, Varsani A. Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran. Virus Research. 2010; http://hdl.handle.net/11427/20753. | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher | Elsevier | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | Virus Research | en_ZA |
| dc.source.uri | http://www.sciencedirect.com/science/article/pii/S0168170210001838 | |
| dc.subject.other | Geminivirus | |
| dc.subject.other | Curtovirus | |
| dc.subject.other | Turnip | |
| dc.title | Turnip curly top virus, a highly divergent geminivirus infecting turnip in Iran | en_ZA |
| dc.type | Journal Article | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Article | en_ZA |