Testing the roles of vertical transmission and drought stress in the prevalence of heritable fungal endophytes in annual grass populations
| Autor: | Jennifer A. Rudgers, Alan Shadow, Marion Donald, Marina Omacini, Brittany R. Cavazos, Teresa Bohner, Tom E. X. Miller, Michelle E. Sneck |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Drought stress FUNGAL ENDOPHYTE Physiology Drought tolerance Zoology Stable equilibrium Plant Science Poaceae 010603 evolutionary biology 01 natural sciences Ciencias Biológicas Symbiosis Stress Physiological DEMOGRAPHY Endophytes Lolium Epichloё VERTICAL TRANSMISSION Analysis of Variance High prevalence biology Epichloe Environmental stressor SYMBIOSIS Fungal endophyte food and beverages Lolium multiflorum Ecología biology.organism_classification Droughts MUTUALISM CIENCIAS NATURALES Y EXACTAS 010606 plant biology & botany LOLIUM MULTIFLORUM |
| Zdroj: | The New phytologist. 219(3) |
| ISSN: | 1469-8137 |
| Popis: | Beneficial inherited symbionts are expected to reach high prevalence in host populations, yet many are observed at intermediate prevalence. Theory predicts that a balance of fitness benefits and efficiency of vertical transmission may interact to stabilize intermediate prevalence. We established populations of grass hosts (Lolium multiflorum) that varied in prevalence of a heritable fungal endophyte (Epichloё occultans), allowing us to infer long-term equilibria by tracking change in prevalence over one generation. We manipulated an environmental stressor (elevated precipitation), which we hypothesized would reduce the fitness benefits of symbiosis, and altered the efficiency of vertical transmission by replacing endophyte-positive seeds with endophyte-free seeds. Endophytes and elevated precipitation both increased host fitness, but symbiont effects were not stronger in the drier treatment, suggesting that benefits of symbiosis were unrelated to drought tolerance. Reduced transmission suppressed the inferred equilibrium prevalence from 42.6% to 11.7%. However, elevated precipitation did not modify prevalence, consistent with the result that it did not modify fitness benefits. Our results demonstrate that failed transmission can influence the prevalence of heritable microbes and that intermediate prevalence can be a stable equilibrium due to forces that allow symbionts to increase (fitness benefits) but prevent them from reaching fixation (failed transmission). Fil: Cavazos, Brittany R.. Rice University; Estados Unidos Fil: Bohner, Teresa F.. Rice University; Estados Unidos Fil: Donald, Marion L.. Rice University; Estados Unidos Fil: Sneck, Michelle E.. Rice University; Estados Unidos Fil: Shadow, Alan. United States Department of Agriculture; Estados Unidos Fil: Omacini, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina Fil: Rudgers, Jennifer A.. University of New Mexico; Estados Unidos Fil: Miller, Tom E. X.. Rice University; Estados Unidos |
| Databáze: | OpenAIRE |
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