DOI: 10.1111/j.1365-3040.1995.tb00564.x. In situ estimation of net CO2 assimilation, photosynthetic electron flow and photorespiration in Turkey oak (Q. cerris L.) leaves: diurnal cycles under different levels of water supply

In situ estimation of net CO2 assimilation, photosynthetic electron flow and photorespiration in Turkey oak (Q. cerris L.) leaves: diurnal cycles under different levels of water supply

10.1111/j.1365-3040.1995.tb00564.x

Crossref journal-article

Wiley

Plant, Cell & Environment (311)

Abstract

ABSTRACTDiurnal time courses of net CO2 assimilation rates, stomatal conductance and light‐driven electron fluxes were measured in situ on attached leaves of 30‐year‐old Turkey oak trees (Quercus cerris L.) under natural summer conditions in central Italy. Combined measurements of gas exchange and chlorophyll a fluorescence under low O2 concentrations allowed the demonstration of a linear relationship between the photochemical efficiency of PSII (fluorescence measurements) and the apparent quantum yield of gross photosynthesis (gas exchange). This relationship was used under normal O2 to compute total light‐driven electron fluxes, and to partition them into fractions used for RuBP carboxylation or RuBP oxygenation. This procedure also yielded an indirect estimate of the rate of photorespiration in vivo. The time courses of light‐driven electron flow, net CO2 assimilation and photorespiration paralleled that of photosynthetic photon flux density, with important afternoon deviations as soon as a severe drought stress occurred, whereas photochemical efficiency and maximal fluorescence underwent large but reversible diurnal decreases. The latter observation indicated the occurrence of a large non‐photochemical energy dissipation at PSII. We estimated that less than 60% of the total photosynthetic electron flow was used for carbon assimilation at midday, while about 40% was devoted to photorespiration. The rate of carbon loss by photorespiration (R1) reached mean levels of 56% of net assimilation rates. The potential application of this technique to analysis of the relative contributions of thermal de‐excitation at PSII and photorespiratory carbon recycling in the protection of photosynthesis against stress effects is discussed.

Bibliography

VALENTINI, R., EPRON, D., DE ANGELIS, P., MATTEUCCI, G., & DREYER, E. (1995). In situ estimation of net CO2 assimilation, photosynthetic electron flow and photorespiration in Turkey oak (Q. cerris L.) leaves: diurnal cycles under different levels of water supply. Plant, Cell & Environment, 18(6), 631â640. Portico.

Authors 5

R. VALENTINI (first)
D. EPRON (additional)
P. DE ANGELIS (additional)
G. MATTEUCCI (additional)
E. DREYER (additional)

References 48 Referenced 398

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{'key': 'e_1_2_2_7_1', 'first-page': '297', 'volume-title': 'Photoinhibition of photosynthesis: from molecular mechanisms to the field', 'author': 'Cornic G.', 'year': '1994'} / Photoinhibition of photosynthesis: from molecular mechanisms to the field by Cornic G. (1994)
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{'key': 'e_1_2_2_28_1', 'first-page': '169', 'volume-title': 'Photoinhibition', 'author': 'Krause G.H.', 'year': '1987'} / Photoinhibition by Krause G.H. (1987)
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{'key': 'e_1_2_2_41_1', 'article-title': 'Long‐term acclimation to elevated CO2 in a natural Quercus ilex community : net photosynthesis and photochemical efficiency of PSII daily courses at different levels of naturally occurring water stress', 'author': 'Scarascia‐Mugnozza G.', 'year': '1994', 'journal-title': 'Tree Physiology'} / Tree Physiology / Long‐term acclimation to elevated CO2 in a natural Quercus ilex community : net photosynthesis and photochemical efficiency of PSII daily courses at different levels of naturally occurring water stress by Scarascia‐Mugnozza G. (1994)
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Dates

Type	When
Created	19 years, 3 months ago (April 30, 2006, 10:18 a.m.)
Deposited	1 year, 10 months ago (Oct. 25, 2023, 9:07 p.m.)
Indexed	1 day, 17 hours ago (Aug. 28, 2025, 8:50 a.m.)
Issued	30 years, 2 months ago (June 1, 1995)
Published	30 years, 2 months ago (June 1, 1995)
Published Online	19 years, 4 months ago (April 28, 2006)
Published Print	30 years, 2 months ago (June 1, 1995)

Funders 0

None

BibTeX

@article{VALENTINI_1995, title={In situ estimation of net CO2 assimilation, photosynthetic electron flow and photorespiration in Turkey oak (Q. cerris L.) leaves: diurnal cycles under different levels of water supply}, volume={18}, ISSN={1365-3040}, url={http://dx.doi.org/10.1111/j.1365-3040.1995.tb00564.x}, DOI={10.1111/j.1365-3040.1995.tb00564.x}, number={6}, journal={Plant, Cell & Environment}, publisher={Wiley}, author={VALENTINI, R. and EPRON, D. and DE ANGELIS, P. and MATTEUCCI, G. and DREYER, E.}, year={1995}, month=jun, pages={631–640} }

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