The impact of elevated ozone and carbon dioxide on young Acer saccharum seedlings

The effects of high O3 (200 nl l−1 during the light period) and high CO2 (650 μl l−1 CO2, 24 h a day) alone and in combination were studied on 45‐day‐old sugar maple (Acer saccharum Marsh.) seedlings for 61 days in growth chambers. After 2 months of treatment under the environmental conditions of th...

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Bibliographic Details
Published in:	Physiologia plantarum Vol. 117; no. 3; pp. 392 - 402
Main Authors:	Gaucher, Catherine, Costanzo, Nadine, Afif, Dany, Mauffette, Yves, Chevrier, Normand, Dizengremel, Pierre
Format:	Journal Article
Language:	English
Published:	Oxford, UK Munksgaard International Publishers 01-03-2003 Blackwell
Subjects:	Acer saccharum Animal, plant and microbial ecology Applied ecology Biological and medical sciences Ecotoxicology, biological effects of pollution Effects of pollution and side effects of pesticides on plants and fungi Fundamental and applied biological sciences. Psychology Non agrochemicals pollutants Phytopathology. Animal pests. Plant and forest protection Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors Pollution effects. Side effects of agrochemicals Plant juvenile growth stage Carbon dioxide Ribulose-bisphosphate carboxylase Lyases Oxidant Biomass Aceraceae Enzymatic activity Acer saccharum Carboxy-lyases Dicotyledones Angiospermae Hardwood forest tree Damage Protection Phosphoenolpyruvate carboxylase Glucose-6-phosphate 1-dehydrogenase Enzyme Detoxification Ozone Pollutant Carbon-carbon lyases Phytotoxicity Poison Defense mechanism Air pollution Spermatophyta Oxidoreductases Photosynthesis
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Summary:	The effects of high O3 (200 nl l−1 during the light period) and high CO2 (650 μl l−1 CO2, 24 h a day) alone and in combination were studied on 45‐day‐old sugar maple (Acer saccharum Marsh.) seedlings for 61 days in growth chambers. After 2 months of treatment under the environmental conditions of the experiment, sugar maple seedlings did not show a marked response to the elevated CO2 treatment: the effect of high CO2 on biomass was only detected in the leaves which developed during the treatment, and assimilation rate was not increased. Under high O3 at ambient CO2, assimilation rate at days 41 and 55 and Rubisco content at day 61 decreased in the first pair of leaves; total biomass was reduced by 43%. In these seedlings large increases (more than 2‐fold) in glucose 6‐phosphate dehydrogenase (G6PDH, EC 1.1.1.49) activity and in anaplerotic CO2 fixation by phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) were observed, suggesting that an enhanced reducing power and carbon skeleton production was needed for detoxification and repair of oxidative damage. Under high O3 at elevated CO2, a stimulation of net CO2 assimilation was observed after 41 days but was no longer observed at day 55. However, at day 61, the total biomass was only reduced by 21% and stimulation of G6PDH and PEPC was less pronounced than under high O3 at ambient CO2. This suggests that high CO2 concentration protects, to some extent, against O3 by providing additional carbon and energy through increased net assimilation.
Bibliography:	ArticleID:PPL046 istex:1471ECBBDD399D3E05C9E4848E135DD3F6E10B09 ark:/67375/WNG-5MJV5BP4-3 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9317 1399-3054
DOI:	10.1034/j.1399-3054.2003.00046.x