Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)

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	Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)
	Zou, DH ; Gao, KS
刊名	CHINESE SCIENCE BULLETIN
	2002-10-01
卷号	47 期号:19 页码:1629-1633
关键词	Porphyra haitanensis photosynthesis bicarbonate inorganic carbon utilization carbonic anhydrase
ISSN号	1001-6538
通讯作者	Gao, KS, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China
中文摘要	The 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.
英文摘要	The 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.
学科主题	Multidisciplinary Sciences
WOS标题词	Science & Technology
类目[WOS]	Multidisciplinary Sciences
研究领域[WOS]	Science & Technology - Other Topics
关键词[WOS]	EXTERNAL CARBONIC-ANHYDRASE ; MARINE MACROALGAE ; INORGANIC CARBON ; ULVA-LACTUCA ; LAMINARIA-SACCHARINA ; ACQUISITION ; ALGAE ; RED ; CHLOROPHYTA ; MECHANISMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000178124400011
公开日期	2010-10-13
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/152342/9794]
专题	水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文
作者单位	1.Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Peoples R China 2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Zou, DH,Gao, KS. Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)[J]. CHINESE SCIENCE BULLETIN,2002,47(19):1629-1633.
APA	Zou, DH,&Gao, KS.(2002).Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta).CHINESE SCIENCE BULLETIN,47(19),1629-1633.
MLA	Zou, DH,et al."Photosynthetic bicarbonate utilization in Porphyra haitanensis (Bangiales, Rhodophyta)".CHINESE SCIENCE BULLETIN 47.19(2002):1629-1633.