Acclimation of two tomato species to high atmospheric CO sub 2 : II. Ribulose-1,5-bisphosphate carboxylase/oxygenase and phosphoenolpyruvate carboxylase

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.90.4.1473· OSTI ID:6868030

Yelle, S; Beeson, Jr, R C; Trudel, M J; Gosselin, A ^[1]

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1. Universite Laval, Quebec (Canada)

Lycopersicon esculentum Mill. cv Vedettos and Lycopersicon chmielewskii Rick, LA 1028, were exposed to two CO{sub 2} concentrations for 10 weeks. The elevated CO{sub 2} concentrations increased the initial ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity of both species for the first 5 weeks of treatment but the difference did not persist during the last 5 weeks. The activity of Mg{sup 2+}-CO{sub 2}-activated Rubisco was higher in 900 microliters per liter for the first 2 weeks but declined sharply thereafter. After 10 weeks, leaves grown at 330 microliters per liter CO{sub 2} had about twice the Rubisco activity compared with those grown at 900 microliters per liter CO{sub 2}. The two species showed the same trend to Rubisco declines under high CO{sub 2} concentrations. The percent activation of Rubisco was always higher under high CO{sub 2}. The phosphoenolpyruvate carboxylase (PEPCase) activity measured in tomato leaves averaged 7.9% of the total Rubisco. PEPCase showed a similar trend with time as the initial Rubisco but with no significant difference between nonenriched and CO{sub 2}-enriched plants. Long-term exposure of tomato plants to high CO{sub 2} was previously shown to induce a decline of photosynthetic efficiency. Based on the current study and on previous results, we propose that the decline of activated Rubisco is the main cause of the acclimation of tomato plants to high CO{sub 2} concentrations.

• OSTI ID: 6868030
• Journal Information: Plant Physiology; (USA), Journal Name: Plant Physiology; (USA) Vol. 90:4; ISSN 0032-0889; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL ADAPTATION
BIOLOGICAL EFFECTS
BIOLOGICAL VARIABILITY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBON-CARBON LYASES
CARBOXY-LYASES
CARBOXYLASE
CHALCOGENIDES
ENZYME ACTIVITY
ENZYMES
FOOD
FRUITS
GENETIC VARIABILITY
LYASES
OXIDES
OXYGEN COMPOUNDS
RIBULOSE DIPHOSPHATE CARBOXYLASE
TOMATOES