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Biological and molecular characterization of Moroccan watermelon mosaic virus and potyvirus isolate from eastern Sudan

Lecoq, H., Dafalla, G., Desbiez, C., Wipf-Scheibel, C., Delecolle, B., Lanina, T., Ullah, Z., Grumet, R.
Plant disease 2001 v.85 no.5 pp. 547-552
Cucumis melo, Potyvirus, plant diseases and disorders, host range, coat proteins, amino acid sequences, strains, immunology, nucleotide sequences, Sudan
A potyvirus (Su-94-54) was isolated from a naturally infected snake cucumber (Cucumis melo var. flexuosus) plant with severe mosaic and leaf deformation symptoms collected in Eastern Sudan. This isolate has a host range limited to cucurbits and is serologically distantly related to Moroccan watermelon mosaic virus (MWMV) and to Papaya ringspot virus (PRSV). Coat protein sequence analysis of Su-94-54 and MWMV and comparison with other potyviruses indicate that Su-94-54 is more closely related to MWMV than to any other potyvirus. Based on the amino acid sequence identity in the core part of the coat protein with MWMV (86%), this isolate could be regarded as a distinct species. However, because of biological, cytological, and serological affinities with MWMV, we propose that this isolate be considered as a strain of MWMV, possibly an evolutionary intermediate between MWMV and PRSV, until more is known on the structure of the PRSV subgroup within the genus Potyvirus.