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Abstract
Seed germination is one of the earliest phenotypes expressed by plants, and the accuracy to germinate in the correct time and place is essential for plant population fitness. Cues that regulate germination have been exhaustively characterized in laboratory experiments. However, the way in which seed populations respond to these cues and the ecological meanings of this phenomenon are scarcely known. To help filling this gap, we studied the thermic [ver mas...]
dc.contributor.authorLopez, Aldana
dc.contributor.authorMarchelli, Paula
dc.contributor.authorBatlla, Diego
dc.contributor.authorLopez, Dardo Ruben
dc.contributor.authorArana, María Veronica
dc.date.accessioned2019-04-10T18:29:01Z
dc.date.available2019-04-10T18:29:01Z
dc.date.issued2019-04
dc.identifier.issn0168-1923
dc.identifier.otherhttps://doi.org/10.1016/j.agrformet.2019.04.002
dc.identifier.urihttp://hdl.handle.net/20.500.12123/4868
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S016819231930142X
dc.description.abstractSeed germination is one of the earliest phenotypes expressed by plants, and the accuracy to germinate in the correct time and place is essential for plant population fitness. Cues that regulate germination have been exhaustively characterized in laboratory experiments. However, the way in which seed populations respond to these cues and the ecological meanings of this phenomenon are scarcely known. To help filling this gap, we studied the thermic regulation of seed germination and its link with local climatic characteristics in Festuca pallescens populations, an iconic perennial grass species of Patagonia. By coupling thermal time models with field and environmental data, we evaluated seed responsiveness to temperature during germination of nine Festuca pallescens populations distributed across their complete longitudinal range in North Patagonia. The idea behind this experimental design was to search for inter-population differences in early life traits relevant for recruitment of the species, and associate seed traits with local environmental characteristics. F. pallescens populations showed strong differences in seed sensitivity to temperature for the thermal regulation of the germination rate, described by the population mean thermal time for germination (θ(50)) and its standard deviation (σθ). The greatest values of θ(50) and σθ corresponded to populations inhabiting harsh environments. Moreover, θ(50) of the different populations showed strong correlations with their local thermal environmental parameters, indicating a relation between seed physiological traits and climate across the longitudinal gradient. We did not observe inter-population differences in the minimum temperature that allows germination (Tb = -0.47 ± 0.19 °C). Higher θ(50) and σθ in populations from harsh climates may constitute a strategy of the species to increase fitness in hostile habitats, preventing anticipated germination and promoting a slower seed bank depletion in regions where establishment is highly limited.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceAgricultural and Forest Meteorology 272-273 : 81-90 (2019)es_AR
dc.subjectFenotiposes_AR
dc.subjectPhenotypeseng
dc.subjectFestucaes_AR
dc.subjectGerminaciónes_AR
dc.subjectGerminationeng
dc.subject.otherRegulación Térmicaes_AR
dc.subject.otherRegión Patagónica
dc.titleSeed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagoniaes_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEstación Experimental Agropecuaria Barilochees_AR
dc.description.filFil: Lopez, Aldana Soledad. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.description.filFil: Marchelli, Paula. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.description.filFil: Batlla, Diego. Universidad de Buenos Aires. Facultad de Agronomía. Catedra de Cerealicultura; Argentinaes_AR
dc.description.filFil: Lopez, Dardo Ruben. Instituto Nacional de Tecnología Agropecuaria (INTA). Estacion Experimental Agropecuaria Manfredi. Estación Forestal Villa Dolores; Argentinaes_AR
dc.description.filFil: Arana, María Verónica. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche, Instituto de Investigaciones Forestales y Agropecuarias Bariloche. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.subtypecientifico


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