Diversification of Rice Yellow Mottle Virus and Related Viruses Spans the History of Agriculture from the Neolithic to the Present

PLoS Pathogens

Séverine Lacombe¹  Denis Fargette²  Agnès Pinel-Galzi²  Eugénie Hébrard²  Gnissa Konaté³  Oumar Traoré³  Drissa Sérémé³ 

[1] Institut de Recherche pour le Développement (IRD), UMR GDP, Montpellier, France;Institut de Recherche pour le Développement (IRD), UMR RPB, Montpellier, France;Institut de l'Environnement et de Recherches Agricoles (INERA), Laboratoire de Biotechnologie et de Virologie Végétale, Kamboinsé, Ouagadougou, Burkina Faso

关键词: Plant viral pathogens;    Viral evolution;    Neolithic period;    Sequence analysis;    Plant evolution;    Speciation;    Agriculture;    Rice;   

DOI  :  10.1371/journal.ppat.1000125

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

The mechanisms of evolution of plant viruses are being unraveled, yet the timescale of their evolution remains an enigma. To address this critical issue, the divergence time of plant viruses at the intra- and inter-specific levels was assessed. The time of the most recent common ancestor (TMRCA) of Rice yellow mottle virus (RYMV; genus Sobemovirus) was calculated by a Bayesian coalescent analysis of the coat protein sequences of 253 isolates collected between 1966 and 2006 from all over Africa. It is inferred that RYMV diversified approximately 200 years ago in Africa, i.e., centuries after rice was domesticated or introduced, and decades before epidemics were reported. The divergence time of sobemoviruses and viruses of related genera was subsequently assessed using the age of RYMV under a relaxed molecular clock for calibration. The divergence time between sobemoviruses and related viruses was estimated to be approximately 9,000 years, that between sobemoviruses and poleroviruses approximately 5,000 years, and that among sobemoviruses approximately 3,000 years. The TMRCA of closely related pairs of sobemoviruses, poleroviruses, and luteoviruses was approximately 500 years, which is a measure of the time associated with plant virus speciation. It is concluded that the diversification of RYMV and related viruses has spanned the history of agriculture, from the Neolithic age to the present.

【 授权许可】

CC BY