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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/73439
Ver los metadatos del registro completo
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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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1844614291418775552 |
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13.070432 |