Respiration of Leaves During Photosynthesis I. Estimates from an Electrical Analogue

Lake, J. V.

doi:10.1071/bi9670487

Cited by 45 publications

(23 citation statements)

References 11 publications

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“…Stomatal resistance is treated as a separate effect superimposed on these processes. This general model has many characteristics in common with models of Peisker (25), Charles-Edwards and Ludwig (3), Chartier (4), Laisk (15), Hall (8), and Lake (16,17) but differs in that it is developed specifically to separate the effects of light, temperature, C02, and 02 on the individual metabolic subprocesses mentioned above.…”

mentioning

confidence: 99%

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

Tenhunen¹,

Weber²,

Yocum³

et al. 1979

Plant Physiol.

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An analysis of the kinetics of simultaneous photosynthesis and photorespiration at the end of a diffusion path is applied to observed net photosynthetic rate as a function of 02 and CO2 concentrations. The data of Ku and Edwards (Plant Physiol. 59. 991-999,1977) from wheat ( Triticum aestivum L.) are analyzed in detail. Ku and Edwards, using an analysis that ignored diffusion resistance between the intercellular air space and fixation site, the competitive effect of CO2 on photorespiration, and the actual concentrations of gases at the fixation site, concluded that: (a) the affinity coefficient of the leaf for CO2 was approximately 3.5 to 5 micromolar, (b) this affinity coefficient is independent of temperature between 25 and 35 C; (c) the effect of 02 was independent of temperature over this range; and (d) competition between CO2 and 02 is responsible for the major share of CO2 loss from photosynthesis due to photorespiration. They suggest that using gas concentrations calculated as equilibium values in the liquid phase is very important in reaching these conclusions. By applying a more complete analysis to their data which includes diffusion in the cell, it is concluded that: (a) the affinity coefficient of the leaf for CO2 is 0.1 to 1.1 micromolar, (b) the temperature dependence of this affinity coefficient cannot be determined from existing data, but there is no evidence to refute independent temperature effect on the two functions of ribulose-1,5-bisphosphate carboxylase-oxygenase being important in the regulation of whole leaf net photosynthesis; and (c) the competitive interplay of CO2 and 02 at ribulose-1,5-bisphosphate carboxylase may under certain conditions lead to a stimulation of fixation by the Calvin cycle because of photorespiration. These conclusions are reached whether CO2 and 02 are expressed as dissolved concentrations or as gas concentrations in the intercellular air space. The relative merits of these two expressions of concentration are discussed. Ku and Edwards (12,13) the whole leaf affinity coefficients for CO2 and 02 regulating total photosynthesis and the photorespiratory process according to the Bowes-Ogren hypothesis (2)? The objective of this paper is to reevaluate the conclusions of Ku and Edwards (12, 13) using an alternative analysis. This second interpretation explains the original data but may lead to very different conclusions, which are fundamental to understanding the photosynthetic response of whole plant leaves to environmental factors.In our analysis (31-33), a stepwise procedure is used to elaborate the environmental regulation of net photosynthesis in terms of physiologically meaningful parameters that characterize: (a) the production of photoproducts in the light reactions of photosynthesis; (b) transport of CO2 from the intercellular air space to the site of fixation; (c) enzymic fixation of C02; and (d) reutilization of photosynthate products in the simultaneous processes of photorespiration and dark respiration. Stomatal resistance is treated as a separ...

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mentioning

confidence: 99%

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

Tenhunen¹,

Weber²,

Yocum³

et al. 1979

Plant Physiol.

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“…This was the assumption made by Monteith (1963). However, he also assumed that for a crop of beans the rate of respiratory CO 2 production in darkness, B*, provided a good estimate of B, whereas it now appears that for beans B<B* (Ozbun, Yolk, and Jackson 1965) while for some other dicotyledons B ";J>B* (Lake 1967). Accurate estimation of r m by Monteith's (1963) method requires accurate information about B and this is not yet available for most plants.…”

Section: Methods Of Estimating Mesophyll Resistancementioning

confidence: 94%

“…The magnitude of f3 depends in part on the relative sizes of two resistances to CO2 transport within the photosynthesizing cells; namely rrw between the respiratory sites and the cell walls, and rro between the respiratory sites and the chloroplasts (Lake 1967). No estimates have been made of the magnitude of rrw for leaves, but in experiments with Ohlorella pyrenoidosa, Good and Brown (1961) found that the resistance to oxygen transport between the respiratory sites and the surface of the cells was negligible compared with the resistance encountered in the agitated solution in which the Ohlorella was suspended.…”

Section: Methods Of Estimating Mesophyll Resistancementioning

confidence: 99%

“…The path from the transducer to the walls of the mesophyll cells is taken to be the same for water vapour as for CO 2 , so the resistance, r tw , in this path can be estimated from measurements of transpiration (Gaastra 1959;Slatyer and Bierhuizen 1964). The resistance r m is then taken to be given by rtc-rtw• The electrical analogue recently developed in connection with leaf respiration during CO2-limited photosynthesis yielded an equation [equation (7) of Lake 1967] which can be written in the form…”

Section: Methods Of Estimating Mesophyll Resistancementioning

confidence: 99%

“…In the light of recent studies of leaf respiration during photosynthesis (Lake 1967), it appears that the magnitude of the mesophyll resistance to CO2 transport and effects of experimental treatments on this resistance have sometimes been overestimated.…”

Section: Introductionmentioning

confidence: 99%

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Respiration of Leaves During Photosynthesis II. Effects on the Estimation of Mesophyll Resistance

Lake¹

1967

Aust. Jnl. Of Bio. Sci.

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Neglect of respiration has led to errors in estimation of the mesophyll resistance to CO2 transport. All current methods lead to overestimation if an increase in photosynthesis is accompanied by an immediate increase in respiration, but two methods are valid if the respiration rate remains constant. An improved method is proposed, in which air of known CO2 content is made to pass through the leaf.

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Interactions among Organelles Involved in Photorespiration

Schnarrenberger¹,

Fock²

1976

Transport in Plants III

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Respiration of Leaves During Photosynthesis I. Estimates from an Electrical Analogue

Cited by 45 publications

References 11 publications

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

Respiration of Leaves During Photosynthesis II. Effects on the Estimation of Mesophyll Resistance

Interactions among Organelles Involved in Photorespiration

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