Effects of subambient and elevated CO[sub 2] on photosynthesis in C[sub 3] and C[sub 4] plants

Conference · Tue Jun 01 04:00:00 EDT 1993 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:6143683

Griffin, K L; Tissue, D T; Thomas, R B; Strain, B R ^[1]

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1. Duke Univ., Durham, NC (United States)

Amaranthus retroflexus (C[sub 4]) and Abutilon theophrasti (C[sub 3]) were grown from seed at 4 CO[sub 2] partial pressures: 15 Pa (Pleistocene), 27 Pa (preindustrial), 35 Pa (current), and 70 Pa (future) in the Duke Phytotron under high light, nutrient and water conditions. Net photosynthesis at the growth CO[sub 2] partial pressures increased with elevated CO[sub 2] for C[sub 3] and C[sub 4] plants. Maximum photosynthetic rates increased by 27% for A. theophrasti grown at current CO[sub 2] compared with 15 Pa, and did not change in plants grown at 70 Pa compared with current CO[sub 2]. Similarly, carboxylation efficiency increased by 26% for plants grown at current CO[sub 2] compared with 15 Pa. The relative stomatal limitation to photosynthesis decreased linearly from 24% to 1% as CO[sub 2] Partial pressures increased from 15 to 70 Pa. Photosynthetic parameters for A. retroflexus changed only slightly over the entire range of CO[sub 2] partial pressures. Results indicate net photosynthesis was correlated with atmospheric CO[sub 2] partial pressures since the Pleistocene for C[sub 3], but not C[sub 4] plants.

• OSTI ID: 6143683
• Report Number(s): CONF-930798--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 74:2
• 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 EFFECTS
C4 SPECIES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLATION
CHALCOGENIDES
CHEMICAL REACTIONS
EFFICIENCY
GROWTH
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
SYNTHESIS