Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis
Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- and belowground dry matter production, (2) root survival, and (3) concentrat...
| Autores principales: | , , , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
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Fundacion Romulo Raggio
2024
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/19380 https://www.techscience.com/phyton/v79nall/36944 https://doi.org/10.32604/phyton.2010.79.055 |
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| author | Gittins Lopez, Cecilia Gabriela Busso, Carlos Alberto Becker, Guillermo Fernando Ghermandi, Luciana Siffredi, Guillermo Lorenzo |
| author_browse | Becker, Guillermo Fernando Busso, Carlos Alberto Ghermandi, Luciana Gittins Lopez, Cecilia Gabriela Siffredi, Guillermo Lorenzo |
| author_facet | Gittins Lopez, Cecilia Gabriela Busso, Carlos Alberto Becker, Guillermo Fernando Ghermandi, Luciana Siffredi, Guillermo Lorenzo |
| author_sort | Gittins Lopez, Cecilia Gabriela |
| collection | INTA Digital |
| description | Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- and belowground dry matter production, (2) root survival, and (3) concentration and content of total non-structural crown + root carbohydrates, and (4) increase root mortality. Five defoliation frequencies (plus 1 control) were applied in a representative grassland of the Occidental District in Patagonia during two consecutive growing seasons. All four hypotheses were rejected. Aerial and belowground dry matter production increased
from one to two or three defoliations. Root production and dynamics were not affected by the study defoliation frequencies. Total nonstructural carbohydrate (TNC) concentration (%) and content (g/ plant) in crown + roots were increased when defoliations augmented from three to five times (%, 2002-2003), or from two to three times (% and g/plant, 2003-04) during the growing cycle, but TNC contents in 2002-03. These results suggest that TNC availability in crown and roots, and plant vigor on P. ligularis in dry Patagonia are favored by light to moderate defoliation frequencies (no more than two or three defoliations annually) immediately before internode elongation to 5 cm stubble height each. |
| format | info:ar-repo/semantics/artículo |
| id | INTA19380 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Fundacion Romulo Raggio |
| publisherStr | Fundacion Romulo Raggio |
| record_format | dspace |
| spelling | INTA193802024-09-13T11:27:09Z Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis Gittins Lopez, Cecilia Gabriela Busso, Carlos Alberto Becker, Guillermo Fernando Ghermandi, Luciana Siffredi, Guillermo Lorenzo Grasses Feed Grasses Gramineas Poa Gramíneas Forrajeras Aerial Dry Weight Defoliation Frecuency Perennial Grasses Root Dymanics Total Non-Structural Carbohydrates Peso Seco Aéreo Frecuencia de Defoliación Gramíneas Perennes Poa Ligularis Dinámica de Raíces Carbohidratos no Estructurales Totales Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- and belowground dry matter production, (2) root survival, and (3) concentration and content of total non-structural crown + root carbohydrates, and (4) increase root mortality. Five defoliation frequencies (plus 1 control) were applied in a representative grassland of the Occidental District in Patagonia during two consecutive growing seasons. All four hypotheses were rejected. Aerial and belowground dry matter production increased from one to two or three defoliations. Root production and dynamics were not affected by the study defoliation frequencies. Total nonstructural carbohydrate (TNC) concentration (%) and content (g/ plant) in crown + roots were increased when defoliations augmented from three to five times (%, 2002-2003), or from two to three times (% and g/plant, 2003-04) during the growing cycle, but TNC contents in 2002-03. These results suggest that TNC availability in crown and roots, and plant vigor on P. ligularis in dry Patagonia are favored by light to moderate defoliation frequencies (no more than two or three defoliations annually) immediately before internode elongation to 5 cm stubble height each. Poa ligularis es una forrajera importante en los pastizales de la Patagonia. Las poblaciones de esta gramínea cespitosa perenne han sido afectadas severamente por el sobrepastoreo. En este estudio proponemos que incrementos en la frecuencia de defoliación reducirán (1) la producción de materia seca aérea y subterránea, (2) la supervivencia de raíces, y (3) la concentración y contenido de carbohidratos no estructurales totales (CNET) en coronas + raíces, e (4) incrementarán la mortalidad de raíces. Se aplicaron cinco frecuencias de defoliación (más un control no defoliado) en un pastizal representativo del Distrito Occidental en Patagonia durante dos estaciones de crecimiento consecutivas. Las cuatro hipótesis fueron rechazadas. La producción de materia seca aérea y subterránea se incrementó de una a dos o tres defoliaciones. La producción y dinámica de raíces no fueron afectadas por las frecuencias de defoliación estudiadas. La concentración (%) y en contenido (g/planta) de los CNET en coronas + raíces se incrementaron cuando la frecuencia se incrementó de tres a cinco defoliaciones (%, 2002-2003), o de dos a tres defoliaciones (%, 2003-2004) durante el ciclo de crecimiento, excepto los contenidos de CNET en 2002-2003. Estos resultados sugieren que la disponibilidad de carbohidratos en coronas + raíces, y el vigor de las plantas de P. ligularis en la zona árida de Patagonia son favorecidos por frecuencias de defoliación bajas a moderadas (no más de dos o tres defoliaciones anuales), a 5 cm desde el nivel del suelo, inmediatamente antes de la elongación de los entrenudos. EEA Bariloche Fil: Gittins López, Cecilia Gabriela. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Busso, Carlos Alberto. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS).; Argentina. Fil: Becker, Guillermo Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Ghermandi, Luciana. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA). Laboratorio ECOTONO; Argentina Fil: Siffredi, Guillermo Lorenzo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina 2024-09-13T11:13:39Z 2024-09-13T11:13:39Z 2010-11 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/19380 https://www.techscience.com/phyton/v79nall/36944 0031-9457 1851-5657 https://doi.org/10.32604/phyton.2010.79.055 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Fundacion Romulo Raggio Phyton - International Journal of Experimental Botany 79: 55-68 (2010) |
| spellingShingle | Grasses Feed Grasses Gramineas Poa Gramíneas Forrajeras Aerial Dry Weight Defoliation Frecuency Perennial Grasses Root Dymanics Total Non-Structural Carbohydrates Peso Seco Aéreo Frecuencia de Defoliación Gramíneas Perennes Poa Ligularis Dinámica de Raíces Carbohidratos no Estructurales Totales Gittins Lopez, Cecilia Gabriela Busso, Carlos Alberto Becker, Guillermo Fernando Ghermandi, Luciana Siffredi, Guillermo Lorenzo Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title | Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title_full | Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title_fullStr | Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title_full_unstemmed | Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title_short | Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis |
| title_sort | defoliation frequency affects morphophysiological traits in the bunchgrass poa ligularis la frecuencia de defoliacion afecta las carcacteristicas morfofisiologicas en la graminea perenne poa ligularis |
| topic | Grasses Feed Grasses Gramineas Poa Gramíneas Forrajeras Aerial Dry Weight Defoliation Frecuency Perennial Grasses Root Dymanics Total Non-Structural Carbohydrates Peso Seco Aéreo Frecuencia de Defoliación Gramíneas Perennes Poa Ligularis Dinámica de Raíces Carbohidratos no Estructurales Totales |
| url | http://hdl.handle.net/20.500.12123/19380 https://www.techscience.com/phyton/v79nall/36944 https://doi.org/10.32604/phyton.2010.79.055 |
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