Archives of Virology (2007) 152, 479-488

E.M. Ateka, E. Barg, R.W. Njeru, G. Thompson and H.J. Vetten (2007)
Biological and molecular variability among geographically diverse isolates of Sweet potato virus 2
Archives of Virology 152 (3), 479-488
Abstract: Sweet potato virus 2 (SPV2) is a tentative member of the genus Potyvirus, family Potyviridae. In addition to the type isolate of SPV2 recently characterised in greater detail, twelve additional isolates of this virus were obtained from sweet potato clones originating from China, Portugal, South Africa and Zambia. Sequences of the coat protein (CP) gene and 3' non-translated region (NTR) were determined. Comparisons of the CP gene sequences of these isolates revealed nucleotide and amino acid sequence identities ranging from 81 to 99% and from 86 to 99%, respectively. Phylogenetic analysis of sequences distinguished several groups, which partially correlated with the geographic origin of the isolates, and indicated that some isolates from South Africa and a Zambian isolate are most distinct both in CP and 3'NTR sequences. Host range studies of a selected number of isolates revealed some differences in test plant reactions, which appeared to correlate to some extent with the geographic origin and molecular distinctness of the SPV2 isolates. The results strongly suggest the occurrence of biologically and genetically diverse strains of SPV2.
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Research topic(s) for pests/diseases/weeds:
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sweet potato virus 2		Portugal (continental)
	Sweet potato virus 2		South Africa
	Sweet potato virus 2		Zambia