Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass

Autores
Quiroga, R. Emiliano; Golluscio, Rodolfo; Blanco, Lisandro Javier; Fernández, Roberto J.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history (semiarid/subhumid × heavily grazed/lightly grazed), established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves (starch) in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller (and with more erect tillers) than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones.
Fil: Quiroga, R. Emiliano. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Golluscio, Rodolfo. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Blanco, Lisandro Javier. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Fernández, Roberto J.. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Materia
Argentinean Arid Chaco Region
Avoidance
Common Garden
Convergence
Defoliation
Drought
Evolution
Natural Selection
Resistance
Tolerance
Trichloris Crinita
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/73439

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network_name_str CONICET Digital (CONICET)
spelling Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrassQuiroga, R. EmilianoGolluscio, RodolfoBlanco, Lisandro JavierFernández, Roberto J.Argentinean Arid Chaco RegionAvoidanceCommon GardenConvergenceDefoliationDroughtEvolutionNatural SelectionResistanceToleranceTrichloris Crinitahttps://purl.org/becyt/ford/4.2https://purl.org/becyt/ford/4It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history (semiarid/subhumid × heavily grazed/lightly grazed), established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves (starch) in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller (and with more erect tillers) than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones.Fil: Quiroga, R. Emiliano. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Golluscio, Rodolfo. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Blanco, Lisandro Javier. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Fernández, Roberto J.. Universidad de Buenos Aires. Facultad de Agronomía; ArgentinaEcological Society of America2010-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/73439Quiroga, R. Emiliano; Golluscio, Rodolfo; Blanco, Lisandro Javier; Fernández, Roberto J.; Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass; Ecological Society of America; Ecological Applications; 20; 7; 10-2010; 1876-18891051-0761CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1890/09-0641.1info:eu-repo/semantics/altIdentifier/url/https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/09-0641.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:28:41Zoai:ri.conicet.gov.ar:11336/73439instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:28:41.896CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
title Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
spellingShingle Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
Quiroga, R. Emiliano
Argentinean Arid Chaco Region
Avoidance
Common Garden
Convergence
Defoliation
Drought
Evolution
Natural Selection
Resistance
Tolerance
Trichloris Crinita
title_short Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
title_full Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
title_fullStr Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
title_full_unstemmed Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
title_sort Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass
dc.creator.none.fl_str_mv Quiroga, R. Emiliano
Golluscio, Rodolfo
Blanco, Lisandro Javier
Fernández, Roberto J.
author Quiroga, R. Emiliano
author_facet Quiroga, R. Emiliano
Golluscio, Rodolfo
Blanco, Lisandro Javier
Fernández, Roberto J.
author_role author
author2 Golluscio, Rodolfo
Blanco, Lisandro Javier
Fernández, Roberto J.
author2_role author
author
author
dc.subject.none.fl_str_mv Argentinean Arid Chaco Region
Avoidance
Common Garden
Convergence
Defoliation
Drought
Evolution
Natural Selection
Resistance
Tolerance
Trichloris Crinita
topic Argentinean Arid Chaco Region
Avoidance
Common Garden
Convergence
Defoliation
Drought
Evolution
Natural Selection
Resistance
Tolerance
Trichloris Crinita
purl_subject.fl_str_mv https://purl.org/becyt/ford/4.2
https://purl.org/becyt/ford/4
dc.description.none.fl_txt_mv It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history (semiarid/subhumid × heavily grazed/lightly grazed), established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves (starch) in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller (and with more erect tillers) than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones.
Fil: Quiroga, R. Emiliano. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Golluscio, Rodolfo. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Blanco, Lisandro Javier. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Fernández, Roberto J.. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
description It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history (semiarid/subhumid × heavily grazed/lightly grazed), established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves (starch) in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller (and with more erect tillers) than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones.
publishDate 2010
dc.date.none.fl_str_mv 2010-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/73439
Quiroga, R. Emiliano; Golluscio, Rodolfo; Blanco, Lisandro Javier; Fernández, Roberto J.; Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass; Ecological Society of America; Ecological Applications; 20; 7; 10-2010; 1876-1889
1051-0761
CONICET Digital
CONICET
url http://hdl.handle.net/11336/73439
identifier_str_mv Quiroga, R. Emiliano; Golluscio, Rodolfo; Blanco, Lisandro Javier; Fernández, Roberto J.; Aridity and grazing as convergent selective forces: An experiment with an Arid Chaco bunchgrass; Ecological Society of America; Ecological Applications; 20; 7; 10-2010; 1876-1889
1051-0761
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1890/09-0641.1
info:eu-repo/semantics/altIdentifier/url/https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/09-0641.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Ecological Society of America
publisher.none.fl_str_mv Ecological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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