Photosynthesis in intact leaves of C3 plants: Physics, physiology and rate limitations

Sharkey, Thomas D.

doi:10.1007/bf02861058

Cited by 822 publications

(602 citation statements)

References 123 publications

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“…Distinct processes regulate the rate of CO 2 assimilation at low and high C i concentrations (Farquhar and Sharkey, 1982;Matyssek et al, 1993b;Sharkey, 1985). The initial slope of the A/C i curve is proportional to the carboxylation activity of Rubisco (i.e., the carboxylation efficiency).…”

Section: Measurement Of Photosynthesismentioning

confidence: 99%

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Choi

Kayama

Jin

et al. 2006

Environmental Pollution

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Section: Measurement Of Photosynthesismentioning

confidence: 99%

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Choi

Kayama

Jin

et al. 2006

Environmental Pollution

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“… . A\C i curve analysis and calculations A\C i curves can be used to estimate some of the major underlying biochemical processes influencing gas exchange and the net uptake of C into a plant (assimilation) (Farquhar et al, 1980 ;Sharkey, 1985 ;Harley & Sharkey, 1991 ;Harley et al, 1992 the Calvin cycle and regeneration of RuBP. The potential rate of electron transport is dependent upon the following :…”

Section: mentioning

confidence: 99%

Pseudothecia of Swiss needle cast fungus, Phaeocryptopus gaeumannii, physically block stomata of Douglas fir, reducing CO₂ assimilation

et al. 2000

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The following study investigates the timing and mechanism of impact of Swiss needle cast on Douglas-fir (Pseudotsuga menziesii) needle physiology (i.e. gas exchange). Swiss needle cast is a foliar disease caused by the fungus Phaeocryptopus gaeumannii, which occurs throughout the range of Douglas fir and until recently has been considered unimportant. However, recent surveys show the Swiss needle cast currently affects 52 611 ha of forested lands in western Oregon, USA, causing a reduction in growth of c. 23% or an implied growth loss of c. 3.2 m$ ha −" yr −" for 1996 alone. Gas exchange of artificially inoculated 2-yr-old Douglas-fir seedlings was monitored on a monthly basis using A\C i curve analysis. No effect of fungal presence on gas exchange was noted until the emergence of fungal fruiting structures (pseudothecia) from needle stomata. However, once present, maximum stomatal conductance and CO # assimilation rates were inversely proportional to the presence of pseudothecia. A\C i curve analysis showed that declines in CO # assimilation appeared to be due to both stomatal and nonstomatal limitations. Stomatal limitations to CO # assimilation were the direct result of reduced CO # diffusion through blocked stomata. Nonstomatal limitations arose, in part, from an indirect effect of pseudothecia development on Rubisco activation. For example, in both Swiss needle cast-infected foliage and foliage with artificially blocked stomata (by external application of petroleum jelly), the amount of Rubisco activation showed a strong, positive relationship with daily maximum stomatal conductance. A mechanism is proposed that outlines the impact of pseudothecia development on stomatal conductance and CO # assimilation rates.

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“…Nobel, 1983 ;Sharkey, 1985). In particular, a positive correlation is usually observed between the net assimilation rate of CO # and the nitrogen (N) content of the leaf (Field & Mooney, 1986 ;Evans, 1989), which may be explained by the fact that up to 75% of leaf organic N is in the chloroplasts, most of it in the photosynthetic machinery (Evans & Seemann, 1989).…”

Section: mentioning

confidence: 99%

Relationships between photosynthesis, nitrogen and leaf structure in 14 grass species and their dependence on the basis of expression

et al. 1999

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The relationships between leaf structure, nitrogen concentration and CO # assimilation rate (A) were studied for 14 grass species grown in the laboratory under non-limiting nutrient conditions. Structural features included leaf thickness and density, and the proportion of leaf volume occupied by different types of tissue (mesophyll, epidermis, vessels and sclerenchyma). Relationships were assessed for data expressed per unit leaf area and fresh mass. The latter was found to be closely related to leaf volume, which allowed us to use A per unit leaf fresh mass (A fm ) as a surrogate of A per unit leaf volume. Assimilation rate per unit leaf area (A a ) was positively correlated with leaf thickness and with the amount of mesophyll per unit leaf area ; the relationship with leaf nitrogen content per unit area was only marginally significant. A fm was negatively correlated with leaf thickness and positively with fresh mass-based leaf organic nitrogen concentration. A multiple regression involving these two variables explained 81% of the variance in A fm . The value of A fm was also significantly related to the proportion of mesophyll in the leaf volume, but surprisingly the correlation was negative. This was because thin leaves with high A fm and nitrogen concentration had proportionally more mechanically supportive tissues than thick ones ; as a consequence, they also had a lower proportion of mesophyll. These data suggest that, in addition to leaf nitrogen, leaf thickness has a strong impact on CO # assimilation rate for the grass species studied.

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Photosynthesis in intact leaves of C3 plants: Physics, physiology and rate limitations

Cited by 822 publications

References 123 publications

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Pseudothecia of Swiss needle cast fungus, Phaeocryptopus gaeumannii, physically block stomata of Douglas fir, reducing CO₂ assimilation

Relationships between photosynthesis, nitrogen and leaf structure in 14 grass species and their dependence on the basis of expression

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Photosynthesis in intact leaves of C3 plants: Physics, physiology and rate limitations

Cited by 822 publications

References 123 publications

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Growth and photosynthetic responses of two pine species (Pinus koraiensis and Pinus rigida) in a polluted industrial region in Korea

Pseudothecia of Swiss needle cast fungus, Phaeocryptopus gaeumannii, physically block stomata of Douglas fir, reducing CO2 assimilation

Relationships between photosynthesis, nitrogen and leaf structure in 14 grass species and their dependence on the basis of expression

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Pseudothecia of Swiss needle cast fungus, Phaeocryptopus gaeumannii, physically block stomata of Douglas fir, reducing CO₂ assimilation