Dataset Information

Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa.

ABSTRACT: Maize streak virus strain A (MSV-A), the causal agent of maize streak disease, is today one of the most serious biotic threats to African food security. Determining where MSV-A originated and how it spread transcontinentally could yield valuable insights into its historical emergence as a crop pathogen. Similarly, determining where the major extant MSV-A lineages arose could identify geographical hot spots of MSV evolution. Here, we use model-based phylogeographic analyses of 353 fully sequenced MSV-A isolates to reconstruct a plausible history of MSV-A movements over the past 150 years. We show that since the probable emergence of MSV-A in southern Africa around 1863, the virus spread transcontinentally at an average rate of 32.5 km/year (95% highest probability density interval, 15.6 to 51.6 km/year). Using distinctive patterns of nucleotide variation caused by 20 unique intra-MSV-A recombination events, we tentatively classified the MSV-A isolates into 24 easily discernible lineages. Despite many of these lineages displaying distinct geographical distributions, it is apparent that almost all have emerged within the past 4 decades from either southern or east-central Africa. Collectively, our results suggest that regular analysis of MSV-A genomes within these diversification hot spots could be used to monitor the emergence of future MSV-A lineages that could affect maize cultivation in Africa.

SUBMITTER: Monjane AL

PROVIDER: S-EPMC3165777 | biostudies-literature | 2011 Sep

REPOSITORIES: biostudies-literature

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Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa.

Monjane Adérito L AL Harkins Gordon W GW Martin Darren P DP Lemey Philippe P Lefeuvre Pierre P Shepherd Dionne N DN Oluwafemi Sunday S Simuyandi Michelo M Zinga Innocent I Komba Ephrem K EK Lakoutene Didier P DP Mandakombo Noella N Mboukoulida Joseph J Semballa Silla S Tagne Appolinaire A Tiendrébéogo Fidèle F Erdmann Julia B JB van Antwerpen Tania T Owor Betty E BE Flett Bradley B Ramusi Moses M Windram Oliver P OP Syed Rizwan R Lett Jean-Michel JM Briddon Rob W RW Markham Peter G PG Rybicki Edward P EP Varsani Arvind A

Journal of virology 20110629 18

Maize streak virus strain A (MSV-A), the causal agent of maize streak disease, is today one of the most serious biotic threats to African food security. Determining where MSV-A originated and how it spread transcontinentally could yield valuable insights into its historical emergence as a crop pathogen. Similarly, determining where the major extant MSV-A lineages arose could identify geographical hot spots of MSV evolution. Here, we use model-based phylogeographic analyses of 353 fully sequenced ...[more]

PMID: 21715477

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Project description:The evolutionary history underlying gradients in species richness is still subject to discussions and understanding the past niche evolution might be crucial in estimating the potential of taxa to adapt to changing environmental conditions. In this study we intend to contribute to elucidation of the evolutionary history of liverwort species richness distributions along elevational gradients at a global scale. For this purpose, we linked a comprehensive data set of genus occurrences on mountains worldwide with a time-calibrated phylogeny of liverworts and estimated mean diversification rates (DivElev) and mean ages (AgeElev) of the respective genera per elevational band. In addition, we reconstructed the ancestral temperature preferences of the genera. We found that diversification rates increase linearly with temperature, and hence decrease with elevation. This pattern is mainly driven by epiphytic genera. In contrast, overall genus age is highest at intermediate elevations where liverwort species richness peaks and decreases towards both ends of the elevational and thermal gradient. Our results further indicate that the ancestral lineages from which the extant liverwort genera descended had a preference for cool and humid habitats. We conclude that the extant liverwort species diversity accumulated over long time under these climatic conditions, which are today prevailing at mid-elevations of the world's mountains. Subsequently, liverworts expanded their ranges from these temperate areas towards warm (with high diversification rates) and cold regions (with low diversification rates), located in contemporaneous (tropical) lowlands and high mountains, respectively. The conserved preference for temperate climates shared by the majority of liverwort lineages gives reason to the assumption that they will not be able to cope with the conditions induced by rapid climate warming, whereas the current low-elevation radiation may be less affected by climate change.

Dataset Information

Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa.

Publications

Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa.

Similar Datasets

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