Summary
During a survey conducted in October 2005, cucurbit leaf samples showing virus-like symptoms were collected from the major cucurbit-growing areas in Tunisia. DAS-ELISA showed the presence of Moroccan watermelon mosaic virus (MWMV, Potyvirus), detected for the first time in Tunisia, in samples from the region of Cap Bon (Northern Tunisia). MWMV isolate TN05-76 (MWMV-Tn) was characterized biologically and its full-length genome sequence was established. MWMV-Tn was found to have biological properties similar to those reported for the MWMV type strain from Morocco. Phylogenetic analysis including the comparison of complete amino-acid sequences of 42 potyviruses confirmed that MWMV-Tn is related (65% amino-acid sequence identity) to Papaya ringspot virus (PRSV) isolates but is a member of a distinct virus species. Sequence analysis on parts of the CP gene of MWMV isolates from different geographical origins revealed some geographic structure of MWMV variability, with three different clusters: one cluster including isolates from the Mediterranean region, a second including isolates from western and central Africa, and a third one including isolates from the southern part of Africa. A significant correlation was observed between geographic and genetic distances between isolates. Isolates from countries in the Mediterranean region where MWMV has recently emerged (France, Spain, Portugal) have highly conserved sequences, suggesting that they may have a common and recent origin. MWMV from Sudan, a highly divergent variant, may be considered an evolutionary intermediate between MWMV and PRSV.
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Correspondence: H. Lecoq, INRA, Station de Pathologie Végétale, Domaine Saint Maurice, B.P. 94, 84143 Montfavet cedex, France
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Yakoubi, S., Desbiez, C., Fakhfakh, H. et al. Biological characterization and complete nucleotide sequence of a Tunisian isolate of Moroccan watermelon mosaic virus . Arch Virol 153, 117–125 (2008). https://doi.org/10.1007/s00705-007-1074-2
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DOI: https://doi.org/10.1007/s00705-007-1074-2