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题名: Combined effects of carbon and phosphorus levels on the invasive cyanobacterium, Cylindrospermopsis raciborskii
作者: Wu, Zhongxing1; Zeng, Bo1; Li, Renhiu2; Song, Lirong2
通讯作者: Wu, ZX (reprint author), Southwest Univ, Sch Life Sci, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ,Chongqing Key Lab Plant Ecology & Res, Chongqing 400715, Peoples R China.
关键词: CO2 ; Cylindrospermopsis raciborskii ; Growth ; Phosphorus ; Photosynthesis
刊名: PHYCOLOGIA
发表日期: 2012-03-01
DOI: 10.2216/10-87.1
卷: 51, 期:2, 页:144-150
收录类别: SCI
文章类型: Article
部门归属: [Wu, Zhongxing; Zeng, Bo] Southwest Univ, Sch Life Sci, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ,Chongqing Key Lab Plant Ecology & Res, Chongqing 400715, Peoples R China; [Li, Renhiu; Song, Lirong] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National Natural Science Foundation of China[30800123]; State Key Basic Research and Development Plan of China[2008CB418002]; Doctoral Foundation Project of China SWU[SWU110065]
类目[WOS]: Plant Sciences ; Marine & Freshwater Biology
研究领域[WOS]: Plant Sciences ; Marine & Freshwater Biology
摘要: The invasive cyanobacterium, Cylindrospermopsis raciborskii, was cultured semicontinuously for 18 days at different carbon and phosphorus levels. Growth and photosynthesis were measured to study the combined effects of CO2 and phosphorus availabilities. The results showed that enrichment of CO2 or inorganic phosphorus (Pi) levels in the culture medium significantly increased specific growth rate (mu) light-saturated photosynthesis (P-m) and photosynthetic efficiency (alpha), but tended to decrease dark respiratory rate (R-d), saturating irradiance for photosynthesis (E-k) and the light compensation point (E-c). However, photosynthetic responses to inorganic carbon concentration in C. raciborskii were affected by interactions between CO2 and Pi. At high Pi concentration, elevated CO2 significantly increased the inorganic carbon-saturated photosynthesis rate (V-max) and substrate concentration giving half-maximal photosynthetic rate [K-0.5 (DIC)], whereas at low Pi levels, elevated CO2 slightly decreased the values of V-max and K-0.5 (DIC). Additionally, enrichment with Pi significantly increased K-0.5 (DIC) and V-max regardless of the CO2 level, suggesting that Pi plays a role in photosynthetic carbon fixation in C. raciborskii. Furthermore, when C. raciborskii was batch cultured in different carbon and phosphorus concentrations for 72 h, the uptake rate of nitrogen increased with enrichment of both CO2 and Pi, while the uptake rate of phosphorus was enhanced only by increases in Pi concentration. The results suggest that the availability of CO2 and phosphorus have combined and independent effects on photosynthesis and nutrient uptake in C. raciborskii, reflecting that changes in environmental factors could influence the dominance of this invasive cyanobacterium. These combined effects need to be considered when generalizing this species response to changing CO2 levels.
英文摘要: The invasive cyanobacterium, Cylindrospermopsis raciborskii, was cultured semicontinuously for 18 days at different carbon and phosphorus levels. Growth and photosynthesis were measured to study the combined effects of CO2 and phosphorus availabilities. The results showed that enrichment of CO2 or inorganic phosphorus (Pi) levels in the culture medium significantly increased specific growth rate (mu) light-saturated photosynthesis (P-m) and photosynthetic efficiency (alpha), but tended to decrease dark respiratory rate (R-d), saturating irradiance for photosynthesis (E-k) and the light compensation point (E-c). However, photosynthetic responses to inorganic carbon concentration in C. raciborskii were affected by interactions between CO2 and Pi. At high Pi concentration, elevated CO2 significantly increased the inorganic carbon-saturated photosynthesis rate (V-max) and substrate concentration giving half-maximal photosynthetic rate [K-0.5 (DIC)], whereas at low Pi levels, elevated CO2 slightly decreased the values of V-max and K-0.5 (DIC). Additionally, enrichment with Pi significantly increased K-0.5 (DIC) and V-max regardless of the CO2 level, suggesting that Pi plays a role in photosynthetic carbon fixation in C. raciborskii. Furthermore, when C. raciborskii was batch cultured in different carbon and phosphorus concentrations for 72 h, the uptake rate of nitrogen increased with enrichment of both CO2 and Pi, while the uptake rate of phosphorus was enhanced only by increases in Pi concentration. The results suggest that the availability of CO2 and phosphorus have combined and independent effects on photosynthesis and nutrient uptake in C. raciborskii, reflecting that changes in environmental factors could influence the dominance of this invasive cyanobacterium. These combined effects need to be considered when generalizing this species response to changing CO2 levels.
关键词[WOS]: DISSOLVED INORGANIC CARBON ; CO2 CONCENTRATING MECHANISMS ; MARINE-PHYTOPLANKTON ; NITROGEN-FIXATION ; PHYSIOLOGICAL-RESPONSES ; TRICHODESMIUM IMS101 ; NITRATE UTILIZATION ; ANACYSTIS-NIDULANS ; EMILIANIA-HUXLEYI ; ELEVATED CO2
语种: 英语
WOS记录号: WOS:000301895200004
ISSN号: 0031-8884
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/17055
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Southwest Univ, Sch Life Sci, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ,Chongqing Key Lab Plant Ecology & Res, Chongqing 400715, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China

Recommended Citation:
Wu, Zhongxing; Zeng, Bo; Li, Renhiu; Song, Lirong.Combined effects of carbon and phosphorus levels on the invasive cyanobacterium, Cylindrospermopsis raciborskii,PHYCOLOGIA,2012,51(2):144-150
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