Journal
SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41598-021-00518-w
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Funding
- l'Agence Nationale pour la Recherche (JCJC MUSEOBACT) [ANR17-CE35-0009-01]
- European Regional Development Fund (ERDF) [GURDT I2016-1731-0006632]
- Region Reunion
- French Agropolis Foundation (Labex Agro -Montpellier, E-SPACE ) [1504004, 1600-004]
- European Community Research Infrastructure Action under the FP7 Capacities Program & CIRAD/AI-CRESI-3/2016 [GBTAF-6437, GB-TAF-7130]
- French Ministry of Higher Education, Research and Innovation, France
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The study presents the first historical genome of a 90-year-old African cassava mosaic virus (ACMV), reconstructed using ancient genomics technology. This sheds light on the evolutionary history of viral plant diseases and emphasizes the importance of natural history collections in studying crop viral diseases.
Emerging viral diseases of plants are recognised as a growing threat to global food security. However, little is known about the evolutionary processes and ecological factors underlying the emergence and success of viruses that have caused past epidemics. With technological advances in the field of ancient genomics, it is now possible to sequence historical genomes to provide a better understanding of viral plant disease emergence and pathogen evolutionary history. In this context, herbarium specimens represent a valuable source of dated and preserved material. We report here the first historical genome of a crop pathogen DNA virus, a 90-year-old African cassava mosaic virus (ACMV), reconstructed from small RNA sequences bearing hallmarks of small interfering RNAs. Relative to tip-calibrated dating inferences using only modern data, those performed with the historical genome yielded both molecular evolution rate estimates that were significantly lower, and lineage divergence times that were significantly older. Crucially, divergence times estimated without the historical genome appeared in discordance with both historical disease reports and the existence of the historical genome itself. In conclusion, our study reports an updated time-frame for the history and evolution of ACMV and illustrates how the study of crop viral diseases could benefit from natural history collections.
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