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dc.contributor.author
Rousseaux, Maria Cecilia
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dc.contributor.author
Hall, Antonio Juan
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dc.contributor.author
Sanchez, Rodolfo Augusto
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dc.date.available
2019-03-14T20:56:25Z
dc.date.issued
2000-12
dc.identifier.citation
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
dc.identifier.issn
0031-9317
dc.identifier.uri
http://hdl.handle.net/11336/71721
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Sunflower
dc.subject
Light Environment
dc.subject
R/Fr Ratio
dc.subject
Senescence
dc.subject.classification
Agricultura
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dc.subject.classification
Agricultura, Silvicultura y Pesca
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Basal leaf senescence in a sunflower (Helianthus annuus) canopy: responses to increased R/FR ratio
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-14T14:11:42Z
dc.journal.volume
110
dc.journal.number
4
dc.journal.pagination
477-482
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Rousseaux, Maria Cecilia. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Hall, Antonio Juan. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Sanchez, Rodolfo Augusto. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Physiologia Plantarum
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1399-3054.2000.1100408.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1399-3054.2000.1100408.x
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