Acclimation of photosynthesis to elevated CO sub 2 in five C sub 3 species. [Chenopodium album, Phaseolus vulgaris, Solanum tuberosum, Solanum melongena, Brassica oleracea]

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.89.2.590· OSTI ID:7190494

Sage, R F ^[1]; Sharkey, T D ^[2]; Seemann, J R ^[3]

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1. Univ. of Georgia, Athens (USA)
2. Univ. of Wisconsin, Madison (USA)
3. Univ. of Nevada, Reno (USA)

The effect of long-term (weeks to months) CO{sub 2} enhancement on (a) the gas-exchange characteristics, (b) the content and activation state of ribulose-1,5-bisphosphate carboxylase (rubisco), and (c) leaf nitrogen, chlorophyll, and dry weight per area were studied in five C{sub 3} species (Chenopodium album, Phaseolus vulgaris, Solanum tuberosum, Solanum melongena, and Brassica oleracea) grown at CO{sub 2} partial pressures of 300 or 900 to 1000 microbars. Long-term exposure to elevated CO{sub 2} affected the CO{sub 2} response of photosynthesis in one of three ways: (a) the initial slope of the CO{sub 2} response was unaffected, but the photosynthetic rate at high CO{sub 2} increased (S. tuberosum); (b) the initial slope decreased but the CO{sub 2}-saturated rate of photosynthesis decreased (B. oleracea, S. melongena). In all five species, growth at high CO{sub 2} increased the extent to which photosynthesis was stimulated following a decrease in the partial pressure of O{sub 2} or an increase in measurement CO{sub 2} above 600 microbars. This stimulation indicates that a limitation on photosynthesis by the capacity to regenerate orthophosphate was reduced or absent after acclimation to high CO{sub 2}. Leaf nitrogen per area either increased (S. tuberosum, S. melongena) or was little changed by CO{sub 2} enhancement. The content of rubisco was lower in only two of the fives species, yet its activation state was 19% to 48% lower in all five species following long-term exposure to high CO{sub 2}. These results indicate that during growth in CO{sub 2}-enriched air, leaf rubisco content remains in excess of that required to support the observed photosynthetic rates.

• DOE Contract Number: FG08-84ER13234
• OSTI ID: 7190494
• Journal Information: Plant Physiology; (USA), Journal Name: Plant Physiology; (USA) Vol. 89:2; ISSN 0032-0889; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
CALVIN CYCLE SPECIES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ENZYME ACTIVITY
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
SYNTHESIS