The evolution of plant virus transmission pathways

JOURNAL OF THEORETICAL BIOLOGY

卷:396

Article

Hamelin, Frederic M.¹  Allen, Linda J. S.²  Prendeville, Holly R.³  Hajimorad, M. Reza⁴  Jeger, Michael J.⁵ 

[1] Agrocampus Ouest, Dept Ecol, IGEPP UMR1349, F-35042 Rennes, France

[2] Texas Tech Univ, Dept Math & Stat, Lubbock, TX 79409 USA

[3] US Forest Serv, USDA, Pacific NW Res Stn, Corvallis, OR 97331 USA

[4] Univ Tennessee, Dept Entomol & Plant Pathol, Knoxville, TN 37996 USA

[5] Univ London Imperial Coll Sci Technol & Med, Ctr Environm Policy, Div Ecol & Evolut, Ascot SL5 7PY, Berks, England

关键词: Horizontal;    Vertical;    Seed;    Pollen;    Vector;    Adaptive dynamics;    Frequency-dependent;    Density-dependent;    Evolutionary branching;    Evolutionary bi-stability;   

DOI  :  10.1016/j.jtbi.2016.02.017

来源: Elsevier

【 摘 要 】

The evolution of plant virus transmission pathways is studied through transmission via seed, pollen, or a vector. We address the questions: under what circumstances does vector transmission make pollen transmission redundant? Can evolution lead to the coexistence of multiple virus transmission pathways? We restrict the analysis to an annual plant population in which reproduction through seed is obligatory. A semi-discrete model with pollen, seed, and vector transmission is formulated to investigate these questions. We assume vector and pollen transmission rates are frequency-dependent and density-dependent, respectively. An ecological stability analysis is performed for the semi-discrete model and used to inform an evolutionary study of trade-offs between pollen and seed versus vector transmission. Evolutionary dynamics critically depend on the shape of the trade-off functions. Assuming a trade-off between pollen and vector transmission, evolution either leads to an evolutionarily stable mix of pollen and vector transmission (concave trade-off) or there is evolutionary bistability (convex trade-off); the presence of pollen transmission may prevent evolution of vector transmission. Considering a trade-off between seed and vector transmission, evolutionary branching and the subsequent coexistence of pollen-borne and vector-borne strains is possible. This study contributes to the theory behind the diversity of plant-virus transmission patterns observed in nature. (C) 2016 Elsevier Ltd All rights reserved.

【 授权许可】

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