A distinct Bemisia tabaci (Gennadius) (Hemiptera: Sternorrhyncha: Aleyrodidae) genotype cluster is associated with the epidemic of severe cassava mosaic virus disease in Uganda

J. P. Legg, R. French, D. Rogan, G. Okao-Okuja, Judith K Brown

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

During the 1990s, an epidemic of cassava mosaic virus disease caused major losses to cassava production in Uganda. Two factors associated with the epidemic were the occurrence of a novel recombinant begomovirus, EACMV-Ug, and unusually high populations of the whitefly vector, Bemisia tabaci. Here we present molecular evidence for the occurrence of two cassava-colonizing B. tabaci genotype clusters, Ug1 and Ug2, one of which, Ug2, can be consistently associated with the CMD epidemic in Uganda at the time of collection in 1997. By contrast, a second genotype cluster, Ug1, only occurred 'at' or 'ahead of' the epidemic 'front', sometimes in mixtures with Ug2. Comparison of mitochondrial cytochrome oxidase I gene sequences for Ug1 and Ug2 and well-studied B. tabaci reference populations indicated that the two Ugandan populations exhibited ≅ 8% divergence, suggesting they represent distinct sub-Saharan African lineages. Neither Ugandan genotype cluster was identified as the widely distributed, polyphagous, and highly fecund B biotype of Old World origin, with which they both diverged by ≅ 8%. Within genotype cluster divergence of Ug1 at 0.61±0.1% was twice that of Ug2 at 0.35±0.1%. Mismatch analysis suggested that Ug2 has undergone a recent population expansion and may be of non-Ugandan origin, whereas Ug1 has diverged more slowly, and is likely to be an indigenous genotype cluster.

Original languageEnglish (US)
Pages (from-to)1219-1229
Number of pages11
JournalMolecular Ecology
Volume11
Issue number7
DOIs
StatePublished - 2002

Fingerprint

African cassava mosaic virus
Sternorrhyncha
Mosaic Viruses
Manihot
Hemiptera
Uganda
cassava
Bemisia tabaci
Electron Transport Complex IV
Virus Diseases
Aleyrodidae
Viruses
virus
genotype
Genes
Genotype
Population
East African cassava mosaic virus
Begomovirus
divergence

Keywords

  • Cassava mosaic geminiviruses
  • CMD
  • EACMV-Ug
  • Molecular markers
  • MtCO1
  • Whiteflies

ASJC Scopus subject areas

  • Ecology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

A distinct Bemisia tabaci (Gennadius) (Hemiptera : Sternorrhyncha: Aleyrodidae) genotype cluster is associated with the epidemic of severe cassava mosaic virus disease in Uganda. / Legg, J. P.; French, R.; Rogan, D.; Okao-Okuja, G.; Brown, Judith K.

In: Molecular Ecology, Vol. 11, No. 7, 2002, p. 1219-1229.

Research output: Contribution to journalArticle

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