Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field
- Autores
- Peri, Pablo Luis; McNeil, David L.; Moot, Derrick; Costa Varella, Alexandre; Lucas, R. J.
- Año de publicación
- 2002
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Maximum light-saturated photosynthetic rate (Pmax) and stomatal conductance (gs) of field-grown cocksfoot (Dactylis glomerata L.) leaves in a silvopastoral system were measured at different times under moderate (850–950 µmol m−2 s−1 photosynthetic photon flux density, PPFD) and severe shade (85–95 µmol m−2 s−1 PPFD). Also Pmax and gs were measured after 30, 60 and 180 min of severe shade to determine the lag in the rise of photosynthesis rate from low to high irradiance levels (induction state). The highest Pmax and gs values obtained were 26·5 µmol CO2 m−2 s−1 and 0·41 mol H2O m−2 s−1 in non-limiting conditions with full sunlight (1900 µmol m−2 s−1 PPFD). These values were defined as standardized dimensionless Pmaxs=1 and gss=1 for comparison of treatment effects. The Pmaxs under severe shade decreased by 0·004 units per minute from 1 to 180 min and reached a steady-state of 0·37 units after 140 min. Under moderate shade, Pmaxs decreased by 0·002 units per minute from 1 to 120 min and reached a steady-state of 0·76 units. The time required to reach full induction on return to full sun (Pmaxs=1) was 15 min after 30 min of severe shade and 37 min after 180 min of shade. Mathematical equations were derived to describe the changes in Pmaxs and gss under severe and moderate shade and during induction. The rate of change of gss was slower than for Pmaxs on entering shade and also slower during the subsequent induction process. This indicated other factors in addition to gs were operating in the reduction and increment of Pmax and a two-step model to explain this is proposed. The defined photosynthetic responses of cocksfoot leaves to fluctuating light regimes could be used to develop quantitative predictions of Pmax for inclusion in a canopy photosynthesis model of silvopastoral systems.
EEA Santa Cruz
Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina
Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral (UNPA); Argentina
Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Argentina
Fil: McNeil, David L. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda
Fil: Moot, Derrick. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda
Fil: Costa Varella, Alexandre. Lincoln University. Plant, Soil and Ecological Sciences Division; Nueva Zelanda
Fil: Lucas, R. J. Lincoln University. Faculty of Agriculture and Life Science; Nueva Zelanda - Fuente
- Grass and Forage Science 57(2): 157-170. (2002)
- Materia
-
Photosynthesis
Shade
Light Regimes
Stomatal Conductance
Silvopastoral Systems
Fotosíntesis
Dactylis glomerata
Sombra
Régimen de Luz
Conductancia Estomática
Sistema Silvopascícola
Cocksfoot
Induction Phase
Leaf Photosynthetic Rate
Silvopastoral Systems
Pasto Ovillo
Fase de Inducción
Tasa Fotosintética de la Hoja
Sistemas Silvopastoriles - Nivel de accesibilidad
- acceso restringido
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Instituto Nacional de Tecnología Agropecuaria
- OAI Identificador
- oai:localhost:20.500.12123/26285
Ver los metadatos del registro completo
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Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the fieldPeri, Pablo LuisMcNeil, David L.Moot, DerrickCosta Varella, AlexandreLucas, R. J.PhotosynthesisShadeLight RegimesStomatal ConductanceSilvopastoral SystemsFotosíntesisDactylis glomerataSombraRégimen de LuzConductancia EstomáticaSistema SilvopascícolaCocksfootInduction PhaseLeaf Photosynthetic RateSilvopastoral SystemsPasto OvilloFase de InducciónTasa Fotosintética de la HojaSistemas SilvopastorilesMaximum light-saturated photosynthetic rate (Pmax) and stomatal conductance (gs) of field-grown cocksfoot (Dactylis glomerata L.) leaves in a silvopastoral system were measured at different times under moderate (850–950 µmol m−2 s−1 photosynthetic photon flux density, PPFD) and severe shade (85–95 µmol m−2 s−1 PPFD). Also Pmax and gs were measured after 30, 60 and 180 min of severe shade to determine the lag in the rise of photosynthesis rate from low to high irradiance levels (induction state). The highest Pmax and gs values obtained were 26·5 µmol CO2 m−2 s−1 and 0·41 mol H2O m−2 s−1 in non-limiting conditions with full sunlight (1900 µmol m−2 s−1 PPFD). These values were defined as standardized dimensionless Pmaxs=1 and gss=1 for comparison of treatment effects. The Pmaxs under severe shade decreased by 0·004 units per minute from 1 to 180 min and reached a steady-state of 0·37 units after 140 min. Under moderate shade, Pmaxs decreased by 0·002 units per minute from 1 to 120 min and reached a steady-state of 0·76 units. The time required to reach full induction on return to full sun (Pmaxs=1) was 15 min after 30 min of severe shade and 37 min after 180 min of shade. Mathematical equations were derived to describe the changes in Pmaxs and gss under severe and moderate shade and during induction. The rate of change of gss was slower than for Pmaxs on entering shade and also slower during the subsequent induction process. This indicated other factors in addition to gs were operating in the reduction and increment of Pmax and a two-step model to explain this is proposed. The defined photosynthetic responses of cocksfoot leaves to fluctuating light regimes could be used to develop quantitative predictions of Pmax for inclusion in a canopy photosynthesis model of silvopastoral systems.EEA Santa CruzFil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; ArgentinaFil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral (UNPA); ArgentinaFil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); ArgentinaFil: McNeil, David L. Lincoln University. Faculty of Agriculture an Life Science; Nueva ZelandaFil: Moot, Derrick. Lincoln University. Faculty of Agriculture an Life Science; Nueva ZelandaFil: Costa Varella, Alexandre. Lincoln University. Plant, Soil and Ecological Sciences Division; Nueva ZelandaFil: Lucas, R. J. Lincoln University. Faculty of Agriculture and Life Science; Nueva ZelandaWiley2026-05-20T13:53:13Z2026-05-20T13:53:13Z2002-09-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/26285https://onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2494.2002.00312.xPeri P.L.; Mcneil D.L.; Moot D.J.; Varella A.C.; Lucas R.J. (2002) Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field. Grass and Forage Science 57(2): 157-170.1365-24940142-5242https://doi.org/10.1046/j.1365-2494.2002.00312.xGrass and Forage Science 57(2): 157-170. (2002)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2026-05-28T08:47:26Zoai:localhost:20.500.12123/26285instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2026-05-28 08:47:26.872INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse |
| dc.title.none.fl_str_mv |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| title |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| spellingShingle |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field Peri, Pablo Luis Photosynthesis Shade Light Regimes Stomatal Conductance Silvopastoral Systems Fotosíntesis Dactylis glomerata Sombra Régimen de Luz Conductancia Estomática Sistema Silvopascícola Cocksfoot Induction Phase Leaf Photosynthetic Rate Silvopastoral Systems Pasto Ovillo Fase de Inducción Tasa Fotosintética de la Hoja Sistemas Silvopastoriles |
| title_short |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| title_full |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| title_fullStr |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| title_full_unstemmed |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| title_sort |
Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field |
| dc.creator.none.fl_str_mv |
Peri, Pablo Luis McNeil, David L. Moot, Derrick Costa Varella, Alexandre Lucas, R. J. |
| author |
Peri, Pablo Luis |
| author_facet |
Peri, Pablo Luis McNeil, David L. Moot, Derrick Costa Varella, Alexandre Lucas, R. J. |
| author_role |
author |
| author2 |
McNeil, David L. Moot, Derrick Costa Varella, Alexandre Lucas, R. J. |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Photosynthesis Shade Light Regimes Stomatal Conductance Silvopastoral Systems Fotosíntesis Dactylis glomerata Sombra Régimen de Luz Conductancia Estomática Sistema Silvopascícola Cocksfoot Induction Phase Leaf Photosynthetic Rate Silvopastoral Systems Pasto Ovillo Fase de Inducción Tasa Fotosintética de la Hoja Sistemas Silvopastoriles |
| topic |
Photosynthesis Shade Light Regimes Stomatal Conductance Silvopastoral Systems Fotosíntesis Dactylis glomerata Sombra Régimen de Luz Conductancia Estomática Sistema Silvopascícola Cocksfoot Induction Phase Leaf Photosynthetic Rate Silvopastoral Systems Pasto Ovillo Fase de Inducción Tasa Fotosintética de la Hoja Sistemas Silvopastoriles |
| dc.description.none.fl_txt_mv |
Maximum light-saturated photosynthetic rate (Pmax) and stomatal conductance (gs) of field-grown cocksfoot (Dactylis glomerata L.) leaves in a silvopastoral system were measured at different times under moderate (850–950 µmol m−2 s−1 photosynthetic photon flux density, PPFD) and severe shade (85–95 µmol m−2 s−1 PPFD). Also Pmax and gs were measured after 30, 60 and 180 min of severe shade to determine the lag in the rise of photosynthesis rate from low to high irradiance levels (induction state). The highest Pmax and gs values obtained were 26·5 µmol CO2 m−2 s−1 and 0·41 mol H2O m−2 s−1 in non-limiting conditions with full sunlight (1900 µmol m−2 s−1 PPFD). These values were defined as standardized dimensionless Pmaxs=1 and gss=1 for comparison of treatment effects. The Pmaxs under severe shade decreased by 0·004 units per minute from 1 to 180 min and reached a steady-state of 0·37 units after 140 min. Under moderate shade, Pmaxs decreased by 0·002 units per minute from 1 to 120 min and reached a steady-state of 0·76 units. The time required to reach full induction on return to full sun (Pmaxs=1) was 15 min after 30 min of severe shade and 37 min after 180 min of shade. Mathematical equations were derived to describe the changes in Pmaxs and gss under severe and moderate shade and during induction. The rate of change of gss was slower than for Pmaxs on entering shade and also slower during the subsequent induction process. This indicated other factors in addition to gs were operating in the reduction and increment of Pmax and a two-step model to explain this is proposed. The defined photosynthetic responses of cocksfoot leaves to fluctuating light regimes could be used to develop quantitative predictions of Pmax for inclusion in a canopy photosynthesis model of silvopastoral systems. EEA Santa Cruz Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral (UNPA); Argentina Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Argentina Fil: McNeil, David L. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda Fil: Moot, Derrick. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda Fil: Costa Varella, Alexandre. Lincoln University. Plant, Soil and Ecological Sciences Division; Nueva Zelanda Fil: Lucas, R. J. Lincoln University. Faculty of Agriculture and Life Science; Nueva Zelanda |
| description |
Maximum light-saturated photosynthetic rate (Pmax) and stomatal conductance (gs) of field-grown cocksfoot (Dactylis glomerata L.) leaves in a silvopastoral system were measured at different times under moderate (850–950 µmol m−2 s−1 photosynthetic photon flux density, PPFD) and severe shade (85–95 µmol m−2 s−1 PPFD). Also Pmax and gs were measured after 30, 60 and 180 min of severe shade to determine the lag in the rise of photosynthesis rate from low to high irradiance levels (induction state). The highest Pmax and gs values obtained were 26·5 µmol CO2 m−2 s−1 and 0·41 mol H2O m−2 s−1 in non-limiting conditions with full sunlight (1900 µmol m−2 s−1 PPFD). These values were defined as standardized dimensionless Pmaxs=1 and gss=1 for comparison of treatment effects. The Pmaxs under severe shade decreased by 0·004 units per minute from 1 to 180 min and reached a steady-state of 0·37 units after 140 min. Under moderate shade, Pmaxs decreased by 0·002 units per minute from 1 to 120 min and reached a steady-state of 0·76 units. The time required to reach full induction on return to full sun (Pmaxs=1) was 15 min after 30 min of severe shade and 37 min after 180 min of shade. Mathematical equations were derived to describe the changes in Pmaxs and gss under severe and moderate shade and during induction. The rate of change of gss was slower than for Pmaxs on entering shade and also slower during the subsequent induction process. This indicated other factors in addition to gs were operating in the reduction and increment of Pmax and a two-step model to explain this is proposed. The defined photosynthetic responses of cocksfoot leaves to fluctuating light regimes could be used to develop quantitative predictions of Pmax for inclusion in a canopy photosynthesis model of silvopastoral systems. |
| publishDate |
2002 |
| dc.date.none.fl_str_mv |
2002-09-05 2026-05-20T13:53:13Z 2026-05-20T13:53:13Z |
| 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/20.500.12123/26285 https://onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2494.2002.00312.x Peri P.L.; Mcneil D.L.; Moot D.J.; Varella A.C.; Lucas R.J. (2002) Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field. Grass and Forage Science 57(2): 157-170. 1365-2494 0142-5242 https://doi.org/10.1046/j.1365-2494.2002.00312.x |
| url |
http://hdl.handle.net/20.500.12123/26285 https://onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2494.2002.00312.x https://doi.org/10.1046/j.1365-2494.2002.00312.x |
| identifier_str_mv |
Peri P.L.; Mcneil D.L.; Moot D.J.; Varella A.C.; Lucas R.J. (2002) Net photosynthesis rate of cocksfoot leaves under continuous and fluctuating shade conditions in the field. Grass and Forage Science 57(2): 157-170. 1365-2494 0142-5242 |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
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info:eu-repo/semantics/restrictedAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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restrictedAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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application/pdf |
| dc.publisher.none.fl_str_mv |
Wiley |
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Wiley |
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Grass and Forage Science 57(2): 157-170. (2002) reponame:INTA Digital (INTA) instname:Instituto Nacional de Tecnología Agropecuaria |
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Instituto Nacional de Tecnología Agropecuaria |
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INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria |
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tripaldi.nicolas@inta.gob.ar |
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