Comparative Ozone Dose Response of Gas Exchange in a Ponderosa Pine Stand Exposed to Long-Term Fumigations

Coyne, Patrick I.; Bingham, Gail E.

doi:10.1080/00022470.1981.10465184

Cited by 43 publications

(13 citation statements)

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“…Ozone exposure in expt 2 (greater ozone stress) resulted in a non-significant trend toward decreased CO.^ assimilation rate (P<O'll). Others have found that the effects of ozone on CO., assimilation rates in ponderosa pine vary depending on duration of exposure and the impact of other stresses such as drought (Coyne & Bingham, 1981;Beyers, Reichers & Temple. 1992;Weber, Clark & Hogsett, 1993).…”

Section: -Labelling Experimentsmentioning

confidence: 99%

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Andersen

Rygiewicz

1995

New Phytologist

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SUMMARYThe effect of ozone on tree growth and metabolism has been studied widely. Despite the research emphasis, relatively little is known about how the below-ground component responds when shoots are exposed to ozone, even though evidence suggests that ozone can affect roots more than shoots. Understanding how ozone affects carbohydrate allocation throughout the plant is essential to understanding the mechanisms of response to ozone. The purpose of this study was to follow the allocation and metabolism of carbon in a Pinus ponderosa Laws. -Heheloma crustuliniforme (Bull.: St. Amans) Qiiel seedling system under ozone stress. The hypothesis that ozone affects carbon transport below ground and overall sink strength of roots similarly in mycorrhizal and non-mycorrhiza! seedlings was tested. To test the hypothesis, a unique culturing system was used to quantify carbon movement ro all components of the symbiosis and to construct an overall budget for carbon for both mycorrhizal and non-mycorrhizal seedlings. Fluxes of CO^ and carbon allocation were followed by measuring instantaneous CO^ flux and by '^C labelling. Two e.\periments were conducted that differed in their total ozone exposure (39-3 ppm h in expt 1, and 581 ppm h in expt 2). Mycorrhiza] inoculation significantly increased COâ ssimilation rates (A) and A/R (R = shoot respiration) ratios in both experiments compared with non-mycorrhizal seedlings. Ozone exposure in expt 2 significantly decreased the A/R ratio (P ^^ 0-003) in both mycorrhiza] treatments. Below-ground respiration was significantly greater in mycorrhiza] than in non-mycorrhizal seedlings in both experiments, and was not affected by ozone exposure. Intact, extramatrical hyphal respiration was lower by 33 "o in seedlings exposed to ozone, but differences were not statistically significant (P ^ Ol 67), Mycorrhiza] seedling roots reached maximum respiratory ^^CO^ re]ease rates c. 5 h and > 20 h earlier than non-mycorrhizal seedlings in expts I and 2, respectively, suggesting accelerated transport of '*C below ground in mycorrhizal seedlings. Alycorrhiza] seed]ings a]so exhibited greater rates of ^*C release below ground than non-mycorrhizal controls. The maximum rate of respiratory re]ease of ^*CC),j be]ow ground was significant]y reduced by exposure to ozone in both mycorrhizal and non-mycorrhiza] treatments. Ozone significant]y reduced "C activity in the fungus of mycorrhiza] p]ants. This constitutes the first report of an ozone-induced reduction in carbon allocation to the fungal symbiont in a mycorrhiza] association. The results suggest a substantial impact of ozone on the carbon balance of the mycorrhiza; however, there was no evidence to suggest that mycorrhizal and nonmycorrhiza] ponderosa pine seedlings responded differently to ozone stress.

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Section: -Labelling Experimentsmentioning

confidence: 99%

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Andersen

Rygiewicz

1995

New Phytologist

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“…Points represent predictions made by TREGRO (''individual growth'') and by ZELIG (''stand growth'') in this study. Photosynthesis effect was reported by Coyne and Bingham (1981). related to the amount of light intercepted (Shugart, 1998) and light decreases exponentially down through the forest canopy (Waring and Running, 1998), trees whose growth has slowed and consequently have their leaf area lower in the canopy experience decreases more rapidly that would be expected from the decrease in tree growth. Over time the direct effect of ozone is magnified by its indirect effect on decreasing the ability of the tree to gain access to needed resources.…”

Section: Discussionmentioning

confidence: 94%

“…Ozone reduces the photosynthetic capacity of large Pinus ponderosa (Coyne and Bingham, 1981;Grulke, 1999) and seedlings (Clark et al, 1995), which can lead to reduced carbon gain (Green and Wright, 1977;Weber et al, 1991), reduced biomass (Bytnerowicz and Grulke, 1992;Weber et al, 1994), and alterations in carbon allocation (Hogsett et al, 1989;Grulke et al, 1998;Tingey et al, 1976;Andersen et al, 1991). Trees from heavily polluted areas exhibited reductions in radial growth, missing rings or altered ring formation compared to trees at less polluted sites (Arbaugh et al, 1999;Miller et al, 1997;Miller and McBride, 1998;Miller, 1993).…”

Section: Introductionmentioning

confidence: 99%

Predicting the effects of tropospheric ozone on regional productivity of ponderosa pine and white fir

Weinstein

Laurence

Retzlaff

et al. 2005

Forest Ecology and Management

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“…Chronic ambient and acute partial pressures of ozone exposure decrease A3 of numerous plant species (3,7,9,16,21,24). Ozone may reduce A by decreasing stomatal conductance (7,25) or by reducing the capacity of mesophyll cells to fix CO2 (9, 10).…”

Section: Methodsmentioning

confidence: 99%

Effects of Ambient and Acute Partial Pressures of Ozone on Leaf Net CO₂ Assimilation of Field-Grown Vitis vinifera L.

Roper

Williams²

1989

Plant Physiol.

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Mature, field-grown Vitis vinifera L. grapevines grown in opentop chambers were exposed to either charcoal-filtered air or ambient ozone partial pressures throughout the growing season. Individual leaves also were exposed to ozone partial pressures of 0.2, 0.4, or 0.6 micropascals per pascal for 5 hours. No visual ozone damage was found on leaves exposed to any of the treatments. Chronic exposure to ambient 03 partial pressures reduced net CO2 assimilation rate (A) between 5 and 13% at various times throughout the season when compared to the filtered treatment. Exposure of leaves to 0.2 micropascals per pascal 03 for 5 hours had no significant effect on A; however, A was reduced 84% for leaves exposed to 0.6 micropascals per pascal 03 when compared to the controls after 5 hours. Intercellular CO2 partial pressure (c,) was lower for leaves exposed to 0.2 micropascals per pascal 03 when compared to the controls, while c, of the leaves treated with 0.6 micropascals per pascal of 03 increased during the fumigation. The long-term effects of ambient 03 and short-term exposure to acute levels of 03 reduced grape leaf photosynthesis due to a reduction in both stomatal and mesophyll conductances.

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Comparative Ozone Dose Response of Gas Exchange in a Ponderosa Pine Stand Exposed to Long-Term Fumigations

Cited by 43 publications

References 13 publications

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Predicting the effects of tropospheric ozone on regional productivity of ponderosa pine and white fir

Effects of Ambient and Acute Partial Pressures of Ozone on Leaf Net CO₂ Assimilation of Field-Grown Vitis vinifera L.

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Comparative Ozone Dose Response of Gas Exchange in a Ponderosa Pine Stand Exposed to Long-Term Fumigations

Cited by 43 publications

References 13 publications

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Allocation of carbon in mycorrhizal Pinus ponderosa seedlings exposed to ozone

Predicting the effects of tropospheric ozone on regional productivity of ponderosa pine and white fir

Effects of Ambient and Acute Partial Pressures of Ozone on Leaf Net CO2 Assimilation of Field-Grown Vitis vinifera L.

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Effects of Ambient and Acute Partial Pressures of Ozone on Leaf Net CO₂ Assimilation of Field-Grown Vitis vinifera L.