dc.creatorGómez González, Susana
dc.creatorOjeda, Fernando
dc.creatorTorres Morales, Patricio
dc.creatorPalma, Jazmín
dc.date.accessioned2016-12-19T17:59:07Z
dc.date.available2016-12-19T17:59:07Z
dc.date.created2016-12-19T17:59:07Z
dc.date.issued2016
dc.identifierPLoS One 11(7): e0159655 Jul 2016
dc.identifier10.1371/journal.pone.0159655
dc.identifierhttps://repositorio.uchile.cl/handle/2250/141964
dc.description.abstractPost-fire recruitment by seeds is regarded as an adaptive response in fire-prone ecosystems. Nevertheless, little is known about which heritable seed traits are functional to the main signals of fire (heat and smoke), thus having the potential to evolve. Here, we explored whether three seed traits (pubescence, dormancy and shape) and fire regime modulate seed response to fire cues(heat and smoke). As a model study system, we used Helenium aromaticum (Asteraceae), a native annual forb from the Chilean matorral, where fires are anthropogenic. We related seed trait values with fitness responses (germination and survival) after exposure to heat-shock and smoke experimental treatments on seeds from 10 H. aromaticum wild populations. We performed a phenotypic selection experiment to examine the relationship of seed traits with post-treatment fitness within a population (adaptive hypothesis). We then explored whether fire frequency in natural habitats was associated with trait expression across populations, and with germination and survival responses to experimental fire-cues. We found that populations subjected to higher fire frequency had, in average, more rounded and pubescent seeds than populations from rarely burned areas. Populations with more rounded and pubescent seeds were more resistant to 80 degrees C heat-shock and smoke treatments. There was correlated selection on seed traits: pubescent-rounded or glabrouscent-elongated seeds had the highest probability of germinating after heat-shock treatments. Seed pubescence and shape in H. aromaticum are heritable traits that modulate adaptive responses to fire. Our results provide new insights into the process of plant adaptation to fire and highlight the relevance of human-made fires as a strong evolutionary agent in the Anthropocene.
dc.languageen
dc.publisherPublic Library Science
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile
dc.sourcePLoS One
dc.titleSeed Pubescence and Shape Modulate Adaptive Responses to Fire Cues
dc.typeArtículo de revista


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