The Interactive Effects of Elevated CO2 and O3 Concentration on Photosynthesis in Spring Wheat

Mckee, I. F.; Farage, P. K.; Long, Stephen P.

doi:10.1007/978-94-009-0173-5_1135

Cited by 43 publications

(99 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is probably the result of a decrease in stomatal conductance in all six species in the elevated compared with the ambient CO # treatments, which resulted in lower O $ uptake (Reich & Amundson, 1985 ;Reich, 1987), supporting hypothesis number one. Similar results were found by McKee et al (1995) and Volin & Reich (1996), but not by Barnes et al (1995) and Kull et al (1996).…”

Section: Cosupporting

confidence: 86%

See 1 more Smart Citation

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

1998

View full text Add to dashboard Cite

Due to their different physiological effects, elevated carbon dioxide and elevated ozone might have interactive impacts on plants, and differentially so on plants differing in photosynthetic pathway and growth rate. To test several hypotheses related to these issues, we examined the physiological, morphological and growth responses of six perennial species grown at various atmospheric concentrations of carbon dioxide and ozone. The species involved (two C $ trees : Populus tremuloides Michx., Quercus rubra L. ; two C $ grasses : Agropyron smithii Rybd., Koeleria cristata L. ; two C % grasses : Bouteloua curtipendula Michx., Schizachyrium scoparium Michx.) differed in growth form, stomatal conductance and photosynthetic pathway. In situ photosynthesis, relative growth rate () and its determinants (leaf area ratio, specific leaf area, leaf weight ratio and root weight ratio) were determined via sequential harvests of seedlings that were grown in all combinations of 366 or 672 µmol mol −" CO # and 3 or 95 nmol mol −" O $ over a 101-d period. Elevated CO # had minimal effect on either photosynthesis or . By contrast,  for all six species was lower in high O $ concentrations at ambient CO # , significantly so in A. smithii and P. tremuloides. Five of the six species also exhibited reductions in in situ photosynthesis at ambient CO # in high-O $ -grown compared with low-O $ -grown plants. For all species, these O $ -induced reductions in  and photosynthesis were absent in the elevated CO # environment. Root weight ratio was significantly reduced by elevated O $ in A. smithii and P. tremuloides in ambient but not elevated CO # . Species with high stomatal conductance were the most susceptible to oxidant injury, while those with low stomatal conductance, such as the C % species and Q. rubra, were not as detrimentally affected by O $ . Elevated levels of CO # will reduce stomatal conductance and O $ uptake, and might therefore reduce the potential for oxidant damage. However, there was a stronger relationship of the percent reduction in whole-plant mass due to O $ , related to the ratio of photosynthesis to stomatal conductance. In general, results of this study of six functionally diverse plant species suggest that O $ pollution effects on carbon balance and growth are likely to be ameliorated by elevated concentrations of atmospheric CO # .

show abstract

Section: Cosupporting

confidence: 86%

“…McKee, Farage & Long (1995), Fangmeier et al (1996), andVolin &Reich (1996) have shown an amelioration of the phytotoxic effects of high O $ on plant growth and physiology in an enriched CO # atmosphere. By contrast, Kull et al (1996) showed no amelioratory effect of O $ in high CO # , but their results indicate a greater plant sensitivity to O $ .…”

mentioning

confidence: 99%

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

1998

View full text Add to dashboard Cite

show abstract

“…There was a significant increase in the number of branches (P 0.01) and a decrease in specific leaf area (P 0.01) with elevated CO # , but no significant increase in plant height, number of leaves and absolute leaf area. This supports the general observation that an increase in atmospheric CO # concentration enhances overall plant growth (McKee et al, 1995 ;Long et al, 1996 ;Mulholland et al, 1998). The higher specific leaf area exhibited by the plants grown at 360 µmol mol −" CO # compared with those grown at 720 µmol mol −" CO # suggests that the former plants might have thinner leaves.…”

Section: Morphological and Anatomical Differencessupporting

confidence: 84%

Effect of elevated CO₂ on the stomatal distribution and leaf physiology of Alnus glutinosa

et al. 2000

View full text Add to dashboard Cite

Variation in stomatal development and physiology of mature leaves from Alnus glutinosa plants grown under reference (current ambient, 360 µmol mol −" CO # ) and double ambient (720 µmol mol −" CO # ) carbon dioxide (CO # ) mole fractions is assessed in terms of relative plant growth, stomatal characters (i.e. stomatal index and density) and leaf photosynthetic characters. This is the first study to consider the effects of elevated CO # concentration on the distribution of stomata and epidermal cells across the whole leaf and to try to ascertain the cause of intraleaf variation. In general, a doubling of the atmospheric CO # concentration enhanced plant growth and significantly increased stomatal index. However, there was no significant change in relative stomatal density. Under elevated CO # concentration there was a significant decrease in stomatal conductance and an increase in assimilation rate. However, no significant differences were found for the maximum rate of carboxylation (V cmax ) and the light saturated rate of electron transport (J max ) between the control and elevated CO # treatment.

show abstract

“…The reduced quantum yield of PSII electron transport appears to be another non-stomatal factor responsible for the genetic difference among the cultivars. Therefore, the larger decline of g s and increase of L s in Y19, Y2 and Y15 were the result rather than the cause of the O 3 -induced A sat , which is also supported by previous chamber studies (Fiscus et al, 1997;McKee et al, 1995). Among all antioxidant variables tested in this study, APX, POD, SOD, GSH, Phenolics and AsA showed significant difference among cultivars (P b 0.05).…”

Section: Discussionsupporting

confidence: 88%

“…The larger decline in V cmax compared to J max (V cmax /J max ) of Y19 underlined the paramount importance of the Rubisco linked photochemical reactions among the non-stomatal factors. This view is supported by previous wheat studies that the greater reduction in A sat in E-O 3 was related to a reduction of Rubisco activity (Farage and Long, 1999;Inada et al, 2012;McKee et al, 1995). The effects of E-O 3 on photoinhibition was significant for Y19, Y2 and Y15 at the final measurement date as represented by reduced AQY (Fig.…”

Section: Discussionsupporting

confidence: 79%

Differential effects of ozone on photosynthesis of winter wheat among cultivars depend on antioxidative enzymes rather than stomatal conductance

Feng

Wang

Pleijel

et al. 2016

Science of The Total Environment

View full text Add to dashboard Cite

• 5 modern cultivars of wheat were investigated under fully open-air field conditions. • Significant O 3 effects were only found during the mid-grain filling stage.• The lower photosynthetic rates were mainly due to nonstomatal factors.• Antioxidative enzymes contributed to the differential response to E-O 3 among cultivars. from the initiation of tillering to final harvest. Pigments, gas exchange rates, chlorophyll a fluorescence, antioxidants contents, antioxidative enzyme activity and lipid oxidation were measured in three replicated plots throughout flag leaf development. Results showed that significant O 3 effects on most variables were only found during the mid-grain filling stage. Across five cultivars, E-O 3 significantly accelerated leaf senescence, as indicated by increased lipid oxidation as well as faster declines in pigment amounts and photosynthetic rates. The lower photosynthetic rates were mainly due to non-stomatal factors, e.g. lower maximum carboxylation capacity and electron transport rates. There were strong interactions between O 3 and cultivar in photosynthetic pigments, light-saturated photosynthesis rate and chlorophyll a fluorescence with O 3 -sensitive (Y19, Y2 and Y15) and O 3 -tolerant (J2, Y16) cultivars being clearly differentiated in their responses to E-O 3 . E-O 3 significantly influenced the antioxidative enzymes but not antioxidant contents. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v cultivar were found in antioxidative enzymes, such as SOD and CAT, but not in stomatal conductance (g s ). Therefore, it can be concluded that antioxidative enzymes rather than g s or antioxidants are responsible for the differential responses to E-O 3 among cultivars. These findings provide important information for the development of accurate modeling O 3 effects on crops, especially with respect to the developmental stage when O 3 damage to photosynthesis becomes manifest.

show abstract

The Interactive Effects of Elevated CO2 and O3 Concentration on Photosynthesis in Spring Wheat

Cited by 43 publications

References 6 publications

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

Effect of elevated CO₂ on the stomatal distribution and leaf physiology of Alnus glutinosa

Differential effects of ozone on photosynthesis of winter wheat among cultivars depend on antioxidative enzymes rather than stomatal conductance

Contact Info

Product

Resources

About

The Interactive Effects of Elevated CO2 and O3 Concentration on Photosynthesis in Spring Wheat

Cited by 43 publications

References 6 publications

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

Elevated carbon dioxide ameliorates the effects of ozone on photosynthesis and growth: species respond similarly regardless of photosynthetic pathway or plant functional group

Effect of elevated CO2 on the stomatal distribution and leaf physiology of Alnus glutinosa

Differential effects of ozone on photosynthesis of winter wheat among cultivars depend on antioxidative enzymes rather than stomatal conductance

Contact Info

Product

Resources

About

Effect of elevated CO₂ on the stomatal distribution and leaf physiology of Alnus glutinosa