GaucherCostanzoAfifEtAl2003

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Gaucher, C., Costanzo, N., Afif, D., Mauffette, Y., Chevrier, N., Dizengremel, P. (2003) The impact of elevated ozone and carbon dioxide on young Acer saccharum seedlings. Physiologia Plantarum, 117(3):392-402.

Résumé

The effects of high O3 (200 nll-1 during the light period) and high CO2 (650 ?ll-1 CO2, 24h 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.

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@ARTICLE { GaucherCostanzoAfifEtAl2003,
    AUTHOR = { Gaucher, C. and Costanzo, N. and Afif, D. and Mauffette, Y. and Chevrier, N. and Dizengremel, P. },
    TITLE = { The impact of elevated ozone and carbon dioxide on young Acer saccharum seedlings },
    JOURNAL = { Physiologia Plantarum },
    YEAR = { 2003 },
    VOLUME = { 117 },
    PAGES = { 392-402 },
    NUMBER = { 3 },
    NOTE = { 00319317 (ISSN) Cited By (since 1996): 5 Export Date: 25 April 2007 Source: Scopus CODEN: PHPLA Language of Original Document: English Correspondence Address: Gaucher, C.; De?pt. des Sci. Biologiques; Univ. du Que. a Montreal; C.P. 8888, Succ centre-ville Montre?al, Que. H3C 3P8, Canada; email: gaucherc@sympatico.ca Chemicals/CAS: carbon dioxide, 124-38-9, 58561-67-4; ozone, 10028-15-6; phosphoenolpyruvate carboxykinase (GTP), 9013-08-5; ribulosebisphosphate carboxylase, 9027-23-0 References: Allen, L.H., Plant response to rising carbon dioxide and potential interactions with air pollutants (1990) J Environ Qual, 19, pp. 15-34; Barnes, J.D., Pfirmann, T., Steiner, K., Lu?tz, C., Busch, U., Ku?chenhoff, H., Payer, H.D., Effects of elevated CO2, elevated O3 and potassium deficiency on Norway spruce (Picea abies L. 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    ABSTRACT = { The effects of high O3 (200 nll-1 during the light period) and high CO2 (650 ?ll-1 CO2, 24h 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. },
    KEYWORDS = { Biomass Carbon dioxide Ozone Sugar (sucrose) Sugar maple seedlings Seed carbon dioxide ozone plant environment interaction Acer saccharum },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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