Effects of short-term ozone exposure on net photosynthesis, dark respiration, and transpiration of three eastern white pine clones

Yang, Yaw-Shing; Skelly, J. M.; Chevone, Boris I.; Birch, Jeffrey B.

doi:10.1016/0160-4120(83)90084-3

Cited by 16 publications

(5 citation statements)

References 16 publications

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“…Yang et al (1983) found that the transpiration was increased in two of three clones of eastern white pine exposed to 200-600 ~tg m -3 ozone for 5 h. Keller and H~isler (1987) observed a similar clone-dependent effect on Norway spruce; the transpiration was inhibited in one clone and unaffected in another clone. Barnes et al (1990b) observed an increase in the transpiration of current-year and 1-year-old needles in Norway spruce exposed to an ozone concentration of 156 gg m -3 for two seasons.…”

Section: Offprint Requests To: G Wallinmentioning

confidence: 63%

The influence of ozone on the stomatal and non-stomatal limitation of photosynthesis in Norway spruce, Picea abies (L.) Karst, exposed to soil moisture deficit

Wallin

Skärby

1992

Trees

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Summary. Norway spruce, Picea abies (L.) Karst., was exposed to charcoal-filtered air (CF) and non-filtered air + ozone (NF+) and periods of soil moisture deficit from 1985 to 1988 in open-top chambers. Net photosynthesis, stomatal conductance, needle water potential and various shoot properties were measured on 1-year-old shoots during a period of soil moisture deficit. The gas exchange was measured at saturating photosynthetic photon flux density and across a range of CO2 concentrations. The soil moisture deficit induced a mild drought stress in the plants, expressed by a pre-dawn needle water potential of approximately -0.9 MPa and a substantial reduction in net photosynthesis and gas phase conductance. In the CF treatment, intercellular CO2 concentration was reduced, but was unaffected in the NF+ treatment. Furthermore, net photosynthesis declined more in response to the soil moisture deficit in the NF+ treatment than in the CF treatment. This is suggested to be attributed to the carboxylation efficiency at the operating point, which was decreased by 47% and 64% in shoots from the CF and the NF+ treatments, respectively. Stomatal limitation of net photosynthesis was increased by drought by 24-45% in the CF treatment, while it was unaffected in the NF+ treatment. Thus, our results imply that the coupling between the stomatal conductance and the photosynthetic rate was changed and that the marginal cost of water per given amount of carbon gain will increase in trees exposed to ozone, during periods of drought.

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Section: Offprint Requests To: G Wallinmentioning

confidence: 63%

The influence of ozone on the stomatal and non-stomatal limitation of photosynthesis in Norway spruce, Picea abies (L.) Karst, exposed to soil moisture deficit

Wallin

Skärby

1992

Trees

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“…Few other studies have ascertained whether or not closure of stomata following O3 treatment actually inhibits photosynthesis, although the need to clarify this issue was raised several years ago (Mansfield 1973) and has recently been reaffirmed by Heath (1994). A number of investigators have deduced from their measurements of CO2 uptake and stomatal conductance that decreases in photosynthesis are not a result of reduced gas phase conductance (Yang et al 1983;Chevone and Yang 1985;Temple 1986;Aben 1990)• However, in one of the few investigations where ci has been estimated, Roper and Williams (1989) concluded that reductions in A produced by 03 fumigations of 200 and 400 nmol mo1-1 were a result of decreased stomatal conductance because there was a decrease in ci. Reduction of ci, however, can only be used as an assessment of the stomatal limitation to photosynthesis if the shape of the response of A to ci is unchanged.…”

Section: Discussionmentioning

confidence: 99%

An in vivo analysis of photosynthesis during short-term O3 exposure in three contrasting species

Farage

Long

1995

Photosynth Res

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The depressions of photosynthetic CO2 uptake following O3 exposures of 200 and 400 nmol mol(-1) for between 4 and 16 h were compared between Pisum sativum, Quercus robur and Triticum aestivum, and the potential causes of change identified in vivo. Photosynthetic change was examined by analysis of CO2, O2, O3 and water vapour exchanges together with chlorophyll fluorescence in controlled environments. Under identical fumigation conditions, each species showed very similar rates of O3 consumption. The light-saturated rate of CO2 uptake showed a statistically significant decrease in each species with increasing O3 dose. Although stomatal conductance declined in parallel with CO2 uptake this did not account for the observed decrease in photosynthesis. The decrease in mesophyll conductance resulted primarily from a decrease in the apparent carboxylation capacity, implying in decreased activity of ribulose 1,5-bisphosphate carboxylase/oxygenase. The maximum capacity of carboxylation was consequently reduced by over 30% and 50% after 16 h fumigation with 200 and 400 nmol mol(-1) O3 respectively. Additionally, in Q. robur, a statistically significant inhibition of the CO2 saturated rate of photosynthesis occurred after 16 h with 400 nmol mol(-1) O3, suggesting that the ability to regenerate ribulose 1,5-bisphosphate was also impaired. None of the species showed any significant decrease in the efficiency of light-limited photosynthesis following fumigation at 200 nmol mol(-1) O3, but effects were apparent at 400 nmol mol(-1) O3. The common feature in all three species was a decline in carboxylation capacity which preceded any other change in the photosynthetic apparatus.

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“…However, the effects of EO 3 on R dark differ among species. Some studies have reported that EO 3 stimulates R dark , which reduces O 3 ‐induced damage by enhancing certain metabolic processes (Barnes, 1972; Yang et al, 1983), whereas other studies have found that EO 3 decreases R dark in response to changes in membrane permeability and mitochondrial structure (Zheng et al, 2012). Such variation in the observed R dark response to EO 3 may be related to differences in the O 3 concentrations and fumigation times used in the studies, and to differences in other environmental factors during the experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Because O 3 formation is driven by sunlight, the diurnal and seasonal peaks of O 3 usually appear in the afternoon and summer, respectively, thus coinciding with the diurnal and seasonal peaks in air temperature. O 3 effects on trees have been widely studied, and O 3 pollution is known to reduce leaf‐scale A sat (e.g., Dai et al, 2017; Xu et al, 2019; Zhang et al, 2014), increase leaf‐scale R (Barnes, 1972; Yang et al, 1983), and reduce the overall tree‐scale growth and productivity (e.g., Feng et al, 2019; Li et al, 2017; Wittig et al, 2009). However, to date only a few studies have focused on the interactive effects of elevated O 3 and warming on trees.…”

Section: Introductionmentioning

confidence: 99%

Reduced photosynthetic thermal acclimation capacity under elevated ozone in poplar (Populus tremula) saplings

Dai

Harmens

et al. 2021

Global Change Biology

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The sensitivity of photosynthesis to temperature has been identified as a key uncertainty for projecting the magnitude of the terrestrial carbon cycle response to future climate change. Although thermal acclimation of photosynthesis under rising temperature has been reported in many tree species, whether tropospheric ozone (O3) affects the acclimation capacity remains unknown. In this study, temperature responses of photosynthesis (light‐saturated rate of photosynthesis (Asat), maximum rates of RuBP carboxylation (Vcmax), and electron transport (Jmax) and dark respiration (Rdark) of Populus tremula exposed to ambient O3 (AO3, maximum of 30 ppb) or elevated O3 (EO3, maximum of 110 ppb) and ambient or elevated temperature (ambient +5°C) were investigated in solardomes. We found that the optimum temperature of Asat (ToptA) significantly increased in response to warming. However, the thermal acclimation capacity was reduced by O3 exposure, as indicated by decreased ToptA, and temperature optima of Vcmax (ToptV) and Jmax (ToptJ) under EO3. Changes in both stomatal conductance (gs) and photosynthetic capacity (Vcmax and Jmax) contributed to the shift of ToptA by warming and EO3. Neither Rdark measured at 25°C (Rdark25) nor the temperature response of Rdark was affected by warming, EO3, or their combination. The responses of Asat, Vcmax, and Jmax to warming and EO3 were closely correlated with changes in leaf nitrogen (N) content and N use efficiency. Overall, warming stimulated growth (leaf biomass and tree height), whereas EO3 reduced growth (leaf and woody biomass). The findings indicate that thermal acclimation of Asat may be overestimated if the impact of O3 pollution is not taken into account.

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Effects of short-term ozone exposure on net photosynthesis, dark respiration, and transpiration of three eastern white pine clones

Cited by 16 publications

References 16 publications

The influence of ozone on the stomatal and non-stomatal limitation of photosynthesis in Norway spruce, Picea abies (L.) Karst, exposed to soil moisture deficit

The influence of ozone on the stomatal and non-stomatal limitation of photosynthesis in Norway spruce, Picea abies (L.) Karst, exposed to soil moisture deficit

An in vivo analysis of photosynthesis during short-term O3 exposure in three contrasting species

Reduced photosynthetic thermal acclimation capacity under elevated ozone in poplar (Populus tremula) saplings

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