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Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)
ZOU Dinghui; GAO Kunshan; Gao, KS, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China
2002
Source PublicationCHINESE SCIENCE BULLETIN
Volume47Issue:19Pages:1629-1633
AbstractThe activities of carbonic anhydrase (CA) and photosynthesis of Porphyra haitanensis were investigated in order to see its photosynthetic utilization of inorganic carbon source. Both intra- and extra-cellular CA activities existed in the thallus. CA inhibitors, acetazolamide (AZ) and ethoxyzolamide (EZ), remarkably depressed the photosynthetic oxygen evolution in seawater of pH 8.2 and 10.0, and EZ showed stronger inhibition than AZ. The observed net photosynthetic rate In seawater of pH 8.2 was much higher than that of CO2 supply theoretically derived from spontaneous dehydration of HCO3-. P. haitanensis also showed a rather high pH compensation point (9.9). The results demonstrated that P. haitanensis could utilize bicarbonate as the external inorganic carbon source for photosynthesis. The bicarbonate utilization was closely associated with HCO3- dehydration catalyzed by extracellular CA activity. The inorganic carbon composition in seawater could well saturate the photosynthesis of P. haitanensis. The low K-m value and compensation points for inorganic carbon reflected the existence of CO2-concentrating mechanism in this alga.
KeywordPorphyra Haitanensis Photosynthesis Bicarbonate Inorganic Carbon Utilization Carbonic Anhydrase
DepartmentShantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Subject AreaMultidisciplinary Sciences
Indexed BySCI
WOS IDWOS:000178124400011
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9794
Collection期刊论文
Corresponding AuthorGao, KS, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China
Recommended Citation
GB/T 7714
ZOU Dinghui,GAO Kunshan,Gao, KS, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China. Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)[J]. CHINESE SCIENCE BULLETIN,2002,47(19):1629-1633.
APA ZOU Dinghui,GAO Kunshan,&Gao, KS, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China.(2002).Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta).CHINESE SCIENCE BULLETIN,47(19),1629-1633.
MLA ZOU Dinghui,et al."Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)".CHINESE SCIENCE BULLETIN 47.19(2002):1629-1633.
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