Too Much of a Good Thing? Long-Term Exposure to Elevated CO2 Decreases Carboxylating and Photorespiratory Enzymes and Increases Respiratory Enzyme Activity in Spruce

Oosten, Jean-Jacques Van; Dizengremel, Pierre; Laitat, Eric; Impens, R.

doi:10.1007/978-3-642-78533-7_11

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Reductions in chlorophyll content and leaf proteins such as Rubisco often are observed in foliage exposed to elevated CO 2 (Lütz et al 2000;Van Oosten et al 1993). It has been suggested that less N is invested into light harvesting proteins, and if nutrient supply is high, increased rates of photosynthesis and growth can be sustained under elevated CO 2 (Saxe et al 1998).…”

Section: Combined Effects Of Elevated O 3 and Comentioning

confidence: 99%

Foliar physiology of yellow-poplar ( Liriodendron tulipifera L.) exposed to O 3 and elevated CO 2 over five seasons.

Rebbeck

Scherzer

Loats

2004

Trees - Structure and Function

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The chronic effects of ozone (O 3 ) alone or combined with elevated carbon dioxide (CO 2 ) on the foliar physiology of unfertilized field-grown yellowpoplar (Liriodendron tulipifera L.) seedlings were studied from 1992 to 1996. Within open-top chambers, juvenile trees were exposed to the following: charcoal-filtered air (CF); 1 ambient ozone (1XO 3 ); 1.5 ambient ozone (1.5XO 3 ); 1.5 ambient ozone plus 700 ppm carbon dioxide (1.5XO 3 +CO 2 ); or chamberless open-air (OA). Seasonal 24-h mean ambient O 3 concentrations ranged from 32 to 46 ppm over the five seasons. Averaged over 5 years, midseason net photosynthesis at saturating light (A sat ) was reduced by 14% (P=0.029) and stomatal conductance (g s ) was reduced, albeit non-significant, by 13% (P =0.096) in upper canopy foliage exposed to 1.5XO 3 -air relative to CF controls. There were no significant differences over the 5 years in A sat and g s between trees grown in 1XO 3 -and 1.5XO 3 -air. Our results support the hypothesis that the magnitude of O 3 effects on A sat and g s decreases as saplings age. When averaged over the five seasons of exposure, total chlorophyll concentration (chl) was not significantly affected by exposure to elevated O 3 ; however, in 1.5XO 3 +CO 2 -air, foliar chl was reduced by 33% relative to all others (P<0.001). In 1.5XO 3 +CO 2 -air, A sat was 1.4-1.9 times higher (P<0.001) and g s was 0.7 times lower (P=0.022) than all others. O 3 uptake in juvenile trees exposed to elevated O 3 plus elevated CO 2 (1.5XO 3 +CO 2 -air) was most comparable to trees exposed to ambient air (1XO 3 ) throughout the study. These findings suggest that elevated CO 2 may minimize the negative effects of O 3 by reducing O 3 uptake through decreased stomatal conductance.

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Section: Combined Effects Of Elevated O 3 and Comentioning

confidence: 99%

Foliar physiology of yellow-poplar ( Liriodendron tulipifera L.) exposed to O 3 and elevated CO 2 over five seasons.

Rebbeck

Scherzer

Loats

2004

Trees - Structure and Function

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“…When acclimation occurs, annuals and perennials show similarities in their long-term response to COj: loss of Rubisco protein and activity, lower chlorophyll (Chi) content, lower Chi a/b ratio, accumulation of carbohydrates. Some of these effects have been shown in tomato (Besford, Withers & Ludwig, 1984;Yelle et al, 1989a, fe;Besford, 1990;Besford et al, 1990), French bean (Porter & Grodzinski, 1984), water hyacinth (Spencer & Bowes, 1986), rice (Rowland-Bamford etal, 1991), cotton (Wong, 1979;De Lucia, Sasek & Strain, 1985), sunflower (Woodrow, 1994), Norway spruce (Van Oosten, Afif & Dizengremel, 1992;Van Oosten et al, 1993), loblolly pine (Tissue, Thomas & Strain, 1993) and cherry . There are no convincing and consistent data on a shift in percentage of activation of Rubisco with growth COj (smaller ",, activation in sunflower leaves in Woodrow (1994); greater % activation in the needles collected from plants grown in high COj see Tissue et al (1993), no change in the % activation of rice leaves acclimated to a range of COj concentrations, see Rowland-Bamford et al, 1991 ; no changes in the % activation in wild type or transgenic tobacco plants acclimated to elevated COj (Sicher, Kremer & Rodermel, 1994)).…”

mentioning

confidence: 98%

Acclimation of tomato to different carbon dioxide concentrations. Relationships between biochemistry and gas exchange during leaf development

Oosten¹,

Wilkins²,

Besford³

1995

New Phytologist

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Tomato plants were transferred to diflerent CO,^ mole fraction.s (3.S(), 700, lCSO and 1400//mol CO.^ mol ') 31 d after sowing (2 "" of full expansion) and the light saturated rate of photosynthesis (P",^^) of the unshaded .Sth leaf was measured at either an ambient CO^ mole fraction, C\ of 350/miol CO^ mol " [P^^^^ (350)] or at the mole fraction of CO,^ at which the plants were grown. At 60 "" and 95 "o leaf expansion, P^^^ of high CO^ grown plants measured at growth CO^, was greater than the P^^,, (350) of the ambient CO^ grown plants. However, by leaf maturity, P,,,,,, (growth CO^) declined linearly as growth CO^ concentration increased. P",^,^ (350) of plants exposed to elevated C().^ up to 60'\, leaf expansion had not acclimated to high CO.^. At 95 "" leaf expansion, f^,,,,. (350) was smaller in the high COj grown plants. Z^^^,, (350) was predicted from Rubisco in vitro carboxylation capacity using tomato Rubisco kinetic constants. By 95% leaf expansion, high CO.^ grown plants showed similarities to the response of plants to low nitrogen supply, in terms of Rubisco and chlorophyll content. The observed and theoretical relationships between the initial slopes of the P,,,^^/C^ responses and Rubisco activity were statistically equivalent. Both short-term and long-term effects of elevated CO^ on dark respiration (/?") were also investigated at two stages of leaf development (50 and 100 "o expansion). /?" (growth CO.^) was smaller for the high CO^ grown plants compared with the control plants, whereas /«" (350) was either equal or greater for the plants grown in high CO^.

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Some Tree Responses to CO2 Enrichment

Eamus

2000

Trace Gas Emissions and Plants

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Too Much of a Good Thing? Long-Term Exposure to Elevated CO2 Decreases Carboxylating and Photorespiratory Enzymes and Increases Respiratory Enzyme Activity in Spruce

Cited by 5 publications

References 22 publications

Foliar physiology of yellow-poplar ( Liriodendron tulipifera L.) exposed to O 3 and elevated CO 2 over five seasons.

Foliar physiology of yellow-poplar ( Liriodendron tulipifera L.) exposed to O 3 and elevated CO 2 over five seasons.

Acclimation of tomato to different carbon dioxide concentrations. Relationships between biochemistry and gas exchange during leaf development

Some Tree Responses to CO2 Enrichment

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