Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 26, Issue 3, Pages 1465-1472Publisher
SPRINGER
DOI: 10.1007/s10811-013-0181-6
Keywords
Arthrospira platensis; Inorganic carbon (Ci); CO2 concentration mechanism (CCM); Morphology; Photosynthesis
Funding
- National Natural Science Foundation [31170338]
- Special Prophase Foundation of National Basic Research Programs of China [2012CB426510]
- Program for Changjiang Scholars and Innovative Research Team [IRT0941]
- MOST [S2012GR0290]
- Zhejiang Provincial Natural Science Foundation [LZ12C03001]
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Arthrospira species grow well under highly enriched inorganic carbon concentrations, but little is known on the effects of inorganic carbon (Ci) limitation on its physiological performance. When Arthrospira platensis D-0083 was grown in a modified medium without NaHCO3 under ambient air of 380 ppm CO2, its trichomes became disassembled while the growth and photosynthetic rates were severely reduced. Phycocyanin and allophycocyanin contents decreased but the carotenoid content increased under the Ci limitation. Compared with the cells grown in Zarrouk medium, the trichomes grown under the Ci limitation increased their photosynthetic apparent affinity for Ci by about 14 times but photochemical quenching capacity was reduced. It appeared that A. platensis increased its CO2 concentrating mechanism by inducing HCO3 (-) transporters and reducing the trichome size which increased filamentous surface to volume ratio.
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