K. Gao et al., INFLUENCE OF ENHANCED CO2 ON GROWTH AND PHOTOSYNTHESIS OF THE RED ALGAE GRACILARIA SP AND G-CHILENSIS, Journal of applied phycology, 5(6), 1993, pp. 563-571
The influence of elevated CO2 concentrations on growth and photosynthe
sis of Gracilaria sp. and G. chilensis was investigated in order to pr
ocure information on the effective utilization of CO2. Growth of both
was enhanced by CO2 enrichment (air + 650 ppm CO2, air + 1250 ppm CO2)
, the enhancement being greater in Gracilaria sp. Both species increas
ed uptake of NO, with CO, enrichment. Photosynthetic inorganic carbon
uptake was depressed in G. chilensis by pre-culture (15 days) with CO2
enrichment, but little affected in Gracilaria sp. Mass spectrometric
analysis showed that O-2 uptake was higher in the light than in the da
rk for both species and in both cases was higher in Gracilaria sp. The
higher growth enhancement in Gracilaria sp. was attributed to greater
depression of photorespiration by the enrichment of CO2 in culture.