Photosynthetic carbon metabolism in Enteromorpha compressa (Chlorophyta)

Journal Article · Tue Dec 01 00:00:00 EST 1987 · J. Phycol.; (United States)

DOI:https://doi.org/10.1111/j.1529-8817.1987.tb04209.x· OSTI ID:6921986

Beer, S; Shragge, B

The intertidal macroalga Enteromorpha compressa showed the ability to use HCO/sub 3//sup -/, as an exogenous inorganic carbon (Ci) source for photosynthesis. However, although the natural sea water concentration of this carbon form was saturating, additional CO/sub 2/ above ambient Ci levels doubled net photosynthetic rates. Therefore, the productivity of this alga, when submerged, is likely to be limited by Ci. When plants were exposed to air, photosynthetic rates saturated at air-levels of CO/sub 2/ during mild desiccation. Based on carbon fixing enzyme activities and Ci pulse-chase incorporation patterns, it was found that Enteromorpha is a C/sub 3/ plant. However, this alga did not show O/sub 2/ inhibited photosynthetic rates at natural sea water Ci conditions. It is suggested that such a C/sub 4/-like gas exchange response is due to the HCO/sub 3//sup -/ utilization system concentrating CO/sub 2/ intracellularly, thus alleviating apparent photorespiration.

• Research Organization: Tel Aviv Univ. (Israel)
• OSTI ID: 6921986
• Journal Information: J. Phycol.; (United States), Vol. 23:4
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID CARBONATES
METABOLISM
ALGAE
PHOTOSYNTHESIS
CARBON DIOXIDE
BIOLOGICAL EFFECTS
CALVIN CYCLE SPECIES
CARBON CYCLE
CARBON DIOXIDE FIXATION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
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