Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio

Autores
Rousseaux, Maria Cecilia; Hall, Antonio Juan; Sanchez, Rodolfo Augusto
Año de publicación
2000
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Senescence of lower leaves (LS) begins before anthesis in sunflower crop canopies. Using isolated field‐grown sunflower plants, it has previously been shown that pre‐anthesis LS is dependent on photosynthetic photon flux density (PPFD) and is hastened by increases in far‐red light. We tested the hypothesis that increasing the red/far‐red ratio (R/FR) perceived by basal leaves within canopies delays LS. To do this, light impinging on the lower surface of north‐oriented 8th leaves (cotyledons=0) of crops with maximum leaf area indexes of 3.3 (Experiment 1) and 2.4 (Experiment 2) was enriched (+8.33 μmol m−2 s−1) with red light using light emitting diode (LED) panels. LED panels constructed with unlit LED or with green LED (PPFD slightly greater than the red LED panels, to compensate for lower efficiency) were used as controls. Compared with controls, additional R significantly (P<0.05) increased R/FR perceived by the lower surface and significantly (P<0.01) delayed LS. On average, leaf duration, as time between full expansion and a 70% diminution of chlorophyll content, was 5 days greater for leaves receiving extra red light (maximum observed LD=27 days). We conclude that an increase in the R/FR ratio can delay LS in crop canopies.
Fil: Rousseaux, Maria Cecilia. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Hall, Antonio Juan. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Sanchez, Rodolfo Augusto. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Sunflower
Light Environment
R/Fr Ratio
Senescence
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:11336/71721
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratioRousseaux, Maria CeciliaHall, Antonio JuanSanchez, Rodolfo AugustoSunflowerLight EnvironmentR/Fr RatioSenescencehttps://purl.org/becyt/ford/4.1https://purl.org/becyt/ford/4Senescence of lower leaves (LS) begins before anthesis in sunflower crop canopies. Using isolated field‐grown sunflower plants, it has previously been shown that pre‐anthesis LS is dependent on photosynthetic photon flux density (PPFD) and is hastened by increases in far‐red light. We tested the hypothesis that increasing the red/far‐red ratio (R/FR) perceived by basal leaves within canopies delays LS. To do this, light impinging on the lower surface of north‐oriented 8th leaves (cotyledons=0) of crops with maximum leaf area indexes of 3.3 (Experiment 1) and 2.4 (Experiment 2) was enriched (+8.33 μmol m−2 s−1) with red light using light emitting diode (LED) panels. LED panels constructed with unlit LED or with green LED (PPFD slightly greater than the red LED panels, to compensate for lower efficiency) were used as controls. Compared with controls, additional R significantly (P<0.05) increased R/FR perceived by the lower surface and significantly (P<0.01) delayed LS. On average, leaf duration, as time between full expansion and a 70% diminution of chlorophyll content, was 5 days greater for leaves receiving extra red light (maximum observed LD=27 days). We conclude that an increase in the R/FR ratio can delay LS in crop canopies.Fil: Rousseaux, Maria Cecilia. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Hall, Antonio Juan. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Sanchez, Rodolfo Augusto. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaWiley Blackwell Publishing, Inc2000-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/71721Rousseaux, Maria Cecilia; Hall, Antonio Juan; Sanchez, Rodolfo Augusto; Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio; Wiley Blackwell Publishing, Inc; Physiologia Plantarum; 110; 4; 12-2000; 477-4820031-9317CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1399-3054.2000.1100408.xinfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1399-3054.2000.1100408.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:33:03Zoai:ri.conicet.gov.ar:11336/71721instacron: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 10:33:03.364CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
title Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
spellingShingle Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
Rousseaux, Maria Cecilia
Sunflower
Light Environment
R/Fr Ratio
Senescence
title_short Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
title_full Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
title_fullStr Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
title_full_unstemmed Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
title_sort Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
dc.creator.none.fl_str_mv Rousseaux, Maria Cecilia
Hall, Antonio Juan
Sanchez, Rodolfo Augusto
author Rousseaux, Maria Cecilia
author_facet Rousseaux, Maria Cecilia
Hall, Antonio Juan
Sanchez, Rodolfo Augusto
author_role author
author2 Hall, Antonio Juan
Sanchez, Rodolfo Augusto
author2_role author
author
dc.subject.none.fl_str_mv Sunflower
Light Environment
R/Fr Ratio
Senescence
topic Sunflower
Light Environment
R/Fr Ratio
Senescence
purl_subject.fl_str_mv https://purl.org/becyt/ford/4.1
https://purl.org/becyt/ford/4
dc.description.none.fl_txt_mv Senescence of lower leaves (LS) begins before anthesis in sunflower crop canopies. Using isolated field‐grown sunflower plants, it has previously been shown that pre‐anthesis LS is dependent on photosynthetic photon flux density (PPFD) and is hastened by increases in far‐red light. We tested the hypothesis that increasing the red/far‐red ratio (R/FR) perceived by basal leaves within canopies delays LS. To do this, light impinging on the lower surface of north‐oriented 8th leaves (cotyledons=0) of crops with maximum leaf area indexes of 3.3 (Experiment 1) and 2.4 (Experiment 2) was enriched (+8.33 μmol m−2 s−1) with red light using light emitting diode (LED) panels. LED panels constructed with unlit LED or with green LED (PPFD slightly greater than the red LED panels, to compensate for lower efficiency) were used as controls. Compared with controls, additional R significantly (P<0.05) increased R/FR perceived by the lower surface and significantly (P<0.01) delayed LS. On average, leaf duration, as time between full expansion and a 70% diminution of chlorophyll content, was 5 days greater for leaves receiving extra red light (maximum observed LD=27 days). We conclude that an increase in the R/FR ratio can delay LS in crop canopies.
Fil: Rousseaux, Maria Cecilia. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Hall, Antonio Juan. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Sanchez, Rodolfo Augusto. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Senescence of lower leaves (LS) begins before anthesis in sunflower crop canopies. Using isolated field‐grown sunflower plants, it has previously been shown that pre‐anthesis LS is dependent on photosynthetic photon flux density (PPFD) and is hastened by increases in far‐red light. We tested the hypothesis that increasing the red/far‐red ratio (R/FR) perceived by basal leaves within canopies delays LS. To do this, light impinging on the lower surface of north‐oriented 8th leaves (cotyledons=0) of crops with maximum leaf area indexes of 3.3 (Experiment 1) and 2.4 (Experiment 2) was enriched (+8.33 μmol m−2 s−1) with red light using light emitting diode (LED) panels. LED panels constructed with unlit LED or with green LED (PPFD slightly greater than the red LED panels, to compensate for lower efficiency) were used as controls. Compared with controls, additional R significantly (P<0.05) increased R/FR perceived by the lower surface and significantly (P<0.01) delayed LS. On average, leaf duration, as time between full expansion and a 70% diminution of chlorophyll content, was 5 days greater for leaves receiving extra red light (maximum observed LD=27 days). We conclude that an increase in the R/FR ratio can delay LS in crop canopies.
publishDate 2000
dc.date.none.fl_str_mv 2000-12
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/11336/71721
Rousseaux, Maria Cecilia; Hall, Antonio Juan; Sanchez, Rodolfo Augusto; Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio; Wiley Blackwell Publishing, Inc; Physiologia Plantarum; 110; 4; 12-2000; 477-482
0031-9317
CONICET Digital
CONICET
url http://hdl.handle.net/11336/71721
identifier_str_mv Rousseaux, Maria Cecilia; Hall, Antonio Juan; Sanchez, Rodolfo Augusto; Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio; Wiley Blackwell Publishing, Inc; Physiologia Plantarum; 110; 4; 12-2000; 477-482
0031-9317
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1399-3054.2000.1100408.x
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1399-3054.2000.1100408.x
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
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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score 13.070432

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