Increasing CO[sub 2] concentration inhibits cytochrome c oxidase (cytox) in vitro, cytochrome pathway (cytpath) activity in plant mitochondria and dark respiration in plant tissue

Conference · Wed Jun 01 00:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7161946

Gonzalez-Meler, M A; Drake, B G; Jacob, J ^[1]; Ribas-Carbo, M; Siedow, J N ^[2]; Aranda, X; Azcon-Bieto, J; Palet, A ^[3]

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1. Smithsonian Environmental Research Center, Edgewater, MD (United States)
2. Duke Univ., Durham, NC (United States)
3. Universitat Barcelona (Spain)

Dark respiration is inhibited in many plant be exposure to elevated atmospheric CO[sub 2] concentration. The addition of 0.2mM free CO[sub 2] in the reaction medium decreased citpath activity in Pisum sativum and Glycine max mitochondria at pH 7.2, possibly by inhibiting cytox. Under similar conditions, activity of purified cytox from beef heart was also inhibited. Cytox activity extracted from plants grown in elevated CO[sub 2] for 7 years was lower than in those grown in normal ambient. The relationship among these effects and the rate of respiration as well as the role of the alternative pathway in each case will be discussed.

• OSTI ID: 7161946
• Report Number(s): CONF-940894-; CODEN: BECLAG
• Journal Information: Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
59 BASIC BIOLOGICAL SCIENCES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
ECOLOGICAL CONCENTRATION
PISUM
BIOLOGICAL PATHWAYS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
OXIDES
OXYGEN COMPOUNDS
PLANTS
560300* - Chemicals Metabolism & Toxicology
550200 - Biochemistry