Effects of doubled atmospheric CO₂ concentration on the photosynthesis and growth of Chlorella pyrenoidosa cultured at varied levels of light

J. Xia, K. Gao-2003

Fisheries Science, 69(4):

Abstract:  

Chlorella pyrenoidosa was cultured with 350 and 700 p.p.m.v. CO₂ at varied levels of light to see the impacts of doubled atmospheric CO₂ concentration on its growth and photosynthesis. The CO₂ enrichment did not affect the growth rate (µ), but significantly increased the cell density when light was sufficiently supplied. The CO₂ enrichment significantly depressed light-saturated photosynthesis and dark respiration in the cells grown under a high-light regime, but not those under a low-light regime. The light-saturating point for photosynthesis and photosynthetic efficiency was not affected by the CO₂ enrichment under either the high-light or low-light conditions.

(Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, China, e-mail of K. Gao: ksgao@stu.edu.cn)

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