Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis

doi:10.1007/s00343-010-9046-x

	Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis
	Fu Xiang 1,2,3; Han Boping 1
	2010-05-10
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	28 期号:3 页码:478-488
文章类型	Article
摘要	Cyanobacteria possess a delicate system known as the carbon concentrating mechanism (CCM), which can efficiently elevate the intracellular inorganic carbon (Ci) concentration via active transportation. The system requires energy supplied by photosystems; therefore, the activity of the Ci transporter is closely related to light intensity. However, the relationship between CCM and light intensity has rarely been evaluated. Here, we present an improved quantitative model of CCM in which light is incorporated, and developed a CCM model that modified after Fridlyand et al. in 1996. Some equations used in this model were inducted to describe the relationship between transport capacity and light intensity, by which the response of the CCM to light change is simulated. Our results indicate that the efficiency of the carbon concentrating system is sensitive to light intensity. When the external Ci concentration was low, CO(2) uptake dominated the total Ci uptake with increasing light intensity, while under high external Ci concentrations HCO(3)(-) uptake primarily contributed to the total Ci uptake. Variations in the ratio of energy allocated between the transport systems could markedly affect the operation of CCM. Indeed, our simulations suggest that various combinations of Ci fluxes can provide a possible approach to detect the way by which the cell distributes energy produced by the photosystems to the two active Ci transport processes. The proportion of the energy consumed on CCM to the total energy expenditure for the fixation of one CO(2) molecule was determined at 18%-40%.; Cyanobacteria possess a delicate system known as the carbon concentrating mechanism (CCM), which can efficiently elevate the intracellular inorganic carbon (Ci) concentration via active transportation. The system requires energy supplied by photosystems; therefore, the activity of the Ci transporter is closely related to light intensity. However, the relationship between CCM and light intensity has rarely been evaluated. Here, we present an improved quantitative model of CCM in which light is incorporated, and developed a CCM model that modified after Fridlyand et al. in 1996. Some equations used in this model were inducted to describe the relationship between transport capacity and light intensity, by which the response of the CCM to light change is simulated. Our results indicate that the efficiency of the carbon concentrating system is sensitive to light intensity. When the external Ci concentration was low, CO2 uptake dominated the total Ci uptake with increasing light intensity, while under high external Ci concentrations HCO3- uptake primarily contributed to the total Ci uptake. Variations in the ratio of energy allocated between the transport systems could markedly affect the operation of CCM. Indeed, our simulations suggest that various combinations of Ci fluxes can provide a possible approach to detect the way by which the cell distributes energy produced by the photosystems to the two active Ci transport processes. The proportion of the energy consumed on CCM to the total energy expenditure for the fixation of one CO2 molecule was determined at 18%-40%.
关键词	Co(2) Concentrating Mechanism Model Light Intensity Inorganic Carbon Transport
学科领域	Limnology ; Oceanography
DOI	10.1007/s00343-010-9046-x
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000278924100007
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/5424
专题	海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.SOA, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Fu Xiang,Han Boping. Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2010,28(3):478-488.
APA	Fu Xiang,&Han Boping.(2010).Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,28(3),478-488.
MLA	Fu Xiang,et al."Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 28.3(2010):478-488.

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