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Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
Published on: July 27, 2018
Watermelon mosaic virus-Morocco is a distinct potyvirus
N M McKern1, P M Strike, O W Barnett
1CSIRO, Division of Biomolecular Engineering, Parkville, Victoria, Australia.
Archives of Virology
|January 1, 1993
Summary
The Morocco isolate of watermelon mosaic virus (WMV) is a distinct potyvirus. Analysis of its coat protein sequence revealed significant differences compared to related viruses like WMV2 and papaya ringspot virus (PRSV-W).
Area of Science:
- Plant Virology
- Molecular Biology
- Biochemistry
Background:
- Watermelon mosaic virus (WMV) is a significant plant pathogen affecting cucurbits.
- Accurate classification of virus isolates is crucial for disease management and epidemiological studies.
- Potyviruses, a large genus of plant viruses, are often differentiated by their coat protein sequences.
Purpose of the Study:
- To determine the taxonomic relationship of the Morocco isolate of watermelon mosaic virus (WMV-Morocco) to other known potyviruses.
- To investigate if WMV-Morocco represents a distinct species within the Potyviridae family.
Main Methods:
- Comparative analysis of tryptic peptide profiles of WMV-Morocco's coat protein using high-performance liquid chromatography (HPLC).
- Sequencing of five tryptic peptides from the WMV-Morocco coat protein.
- Comparison of obtained peptide sequences with homologous sequences from related potyviruses, including WMV2, soybean mosaic virus, papaya ringspot virus (PRSV-W), and zucchini yellow mosaic virus.
Main Results:
- Tryptic peptide profiles indicated substantial differences in the coat protein sequence of WMV-Morocco compared to WMV2, PRSV-W, and other related potyviruses.
- Sequence identity between WMV-Morocco coat protein peptides and those of PRSV-W, WMV2, and zucchini yellow mosaic virus ranged from 61% to 68%.
- These sequence similarities are below the threshold typically observed between strains of the same potyvirus species.
Conclusions:
- WMV-Morocco should be classified as a distinct potyvirus species, separate from previously characterized WMV isolates and related potyviruses.
- The coat protein sequence serves as a reliable molecular marker for differentiating potyvirus species.
- This finding has implications for understanding WMV diversity and developing targeted control strategies.
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