Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply

Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clo...

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Autores principales:	Bown,Horacio E, Mason,Euan G, Clinton,Peter W, Watt,Michael S
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2009
Materias:	Chlorophyll fluorescence quantum efficiency of PSII electron transport genotype nutrient limitation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012
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spelling	oai:scielo:S0718-162020090003000122010-09-06Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supplyBown,Horacio EMason,Euan GClinton,Peter WWatt,Michael S Chlorophyll fluorescence quantum efficiency of PSII electron transport genotype nutrient limitation Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clones, 68 plants) and eighteen (2 clones, 48 plants). Plant growth in stem diameter, height, leaf area, fascicle mass, length and diameter were found to significantly increase with N and, to a lesser extent, P additions; and these values were greatest when both N and P were combined. Plant growth and fascicle size also varied significantly across clones and were generally consistent with the genotypic growth responses that were observed in the field. Dark (Fv / Fm) and light-adapted (ΦPSII) photochemical efficiency of PSII were found to significantly increase with N and, to a lesser extent, P addition; and the combined effects of N and P exceeded those of the individual contributions. Stern-Volmer non-photochemical quenching, which relates to the proportion of energy dissipated as heat, did not significantly increase as plants became more N or P deficient. Chlorophyll fluorescence variables did not differ between clones. We found positive linear relationships between photosynthetic rates at 360 µmolmol-1 CO2 concentration and 1500 µmol photons m-2s-1 of irradiance (Asat), Fv / Fm and ΦPSII and both foliar nitrogen (Na) and phosphorus (Pa) concentration on a leaf area basis when a ratio of Na/Pa equal to 23 mol·mol-1 was used to partition N from P deficiencies. These relationships were independent of genotype. Chlorophyll fluorescence and gas exchange estimates of electron transport were well correlated under ambient photorespiratory conditions, suggesting that chlorophyll fluorescence variables are a good surrogate for gas exchange measurements in our experimental conditions.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.36 n.3 20092009-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012en10.4067/S0718-16202009000300012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chlorophyll fluorescence quantum efficiency of PSII electron transport genotype nutrient limitation
spellingShingle	Chlorophyll fluorescence quantum efficiency of PSII electron transport genotype nutrient limitation Bown,Horacio E Mason,Euan G Clinton,Peter W Watt,Michael S Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
description	Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clones, 68 plants) and eighteen (2 clones, 48 plants). Plant growth in stem diameter, height, leaf area, fascicle mass, length and diameter were found to significantly increase with N and, to a lesser extent, P additions; and these values were greatest when both N and P were combined. Plant growth and fascicle size also varied significantly across clones and were generally consistent with the genotypic growth responses that were observed in the field. Dark (Fv / Fm) and light-adapted (ΦPSII) photochemical efficiency of PSII were found to significantly increase with N and, to a lesser extent, P addition; and the combined effects of N and P exceeded those of the individual contributions. Stern-Volmer non-photochemical quenching, which relates to the proportion of energy dissipated as heat, did not significantly increase as plants became more N or P deficient. Chlorophyll fluorescence variables did not differ between clones. We found positive linear relationships between photosynthetic rates at 360 µmolmol-1 CO2 concentration and 1500 µmol photons m-2s-1 of irradiance (Asat), Fv / Fm and ΦPSII and both foliar nitrogen (Na) and phosphorus (Pa) concentration on a leaf area basis when a ratio of Na/Pa equal to 23 mol·mol-1 was used to partition N from P deficiencies. These relationships were independent of genotype. Chlorophyll fluorescence and gas exchange estimates of electron transport were well correlated under ambient photorespiratory conditions, suggesting that chlorophyll fluorescence variables are a good surrogate for gas exchange measurements in our experimental conditions.
author	Bown,Horacio E Mason,Euan G Clinton,Peter W Watt,Michael S
author_facet	Bown,Horacio E Mason,Euan G Clinton,Peter W Watt,Michael S
author_sort	Bown,Horacio E
title	Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
title_short	Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
title_full	Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
title_fullStr	Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
title_full_unstemmed	Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
title_sort	chlorophyll fluorescence response of pinus radiata clones to nitrogen and phosphorus supply
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012
work_keys_str_mv	AT bownhoracioe chlorophyllfluorescenceresponseofpinusradiataclonestonitrogenandphosphorussupply AT masoneuang chlorophyllfluorescenceresponseofpinusradiataclonestonitrogenandphosphorussupply AT clintonpeterw chlorophyllfluorescenceresponseofpinusradiataclonestonitrogenandphosphorussupply AT wattmichaels chlorophyllfluorescenceresponseofpinusradiataclonestonitrogenandphosphorussupply
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Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply

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