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Roger Guevara

Red de Biología Evolutiva
Carretera Antigua a Coatepec 351 (Jardín Botánico)
El Haya
Xalapa, Ver 91070
Mexico
roger.guevara@inecol.edu.mx
Born in Mexico City,
BsC Universidad Veracruzana
PhD Bath University
Postdoc Stanford University



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Journal articles

2012
Ana Aguilar-Chama, Roger Guevara (2012)  Mycorrhizal colonization does not affect tolerance to defoliation of an annual herb in different light availability and soil fertility treatments but increases flower size in light-rich environments   OECOLOGIA 168: 1. 131-139 January  
Abstract: Heterogeneous distribution of resources in most plant populations results in a mosaic of plant physiological responses tending to maximize plant ï¬tness. This includes plant responses to trophic interactions such as herbivory and mycorrhizal symbiosis which are concurrent in most plants. We explored ï¬tness costs of 50% manual defoliation and mycorrhizal inoculation in Datura stramonium at different light availability and soil fertility environments in a greenhouse experiment. Overall, we showed that non-inoculated and mycorrhiza-inoculated plants did not suffer from 50% manual defoliation in all the tested combinations of light availability and soil fertility treatments, while soil nutrients and light availability predominately affected plant responses to the mycorrhizal inoculation. Fifty percent defoliation had a direct negative effect on reproductive traits whereas mycorrhiza-inoculated plants produced larger ï¬owers than non-inoculated plants when light was not a limiting factor. Although D. stramonium is a facultative selï¬ng species, other investigations had shown clear advantages of cross-pollination in this species; therefore, the effects of mycorrhizal inoculation on ï¬ower size observed in this study open new lines of inquiry for our understanding of plant responses to trophic interactions. Also in this study, we detected shifts in the limiting resources affecting plant responses to trophic interactions.
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