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学科主题: Marine & Freshwater Biology
题名: Mechanism of photosynthetic response in Microcystis aeruginosa PCC7806 to low inorganic phosphorus
作者: Wang, Zhicong1, 2; Li, Dunhai1; Li, Guowen1, 2; Liu, Yongding1
通讯作者: Li, DH, Chinese Acad Sci, Inst Hydrobiol, 7 S Donghu Rd, Wuhan 430072, Peoples R China
关键词: Chlorophyll fluorescence ; Microcystis aeruginosa PCC7806 ; Phosphorus-deficiency ; Photosynthetic response ; Thylakoid membrane fluidity
刊名: HARMFUL ALGAE
发表日期: 2010-09-01
DOI: 10.1016/j.hal.2010.04.012
卷: 9, 期:6, 页:613-619
收录类别: SCI
文章类型: Article
部门归属: [Wang, Zhicong; Li, Dunhai; Li, Guowen; Liu, Yongding] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Wang, Zhicong; Li, Guowen] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2008ZX07103-004-01-01, 2008ZX07104-005-3]
类目[WOS]: Marine & Freshwater Biology
研究领域[WOS]: Marine & Freshwater Biology
摘要: Photosynthetic response of Microcystis aeruginosa PCC7806 to different concentrations of phosphorus supply was studied so as to elucidate if the declining process of Microcystis bloom under freshwater ecosystem is related to soluble reactive phosphorus (SRP) decrease in water volume. Growth rate of M. aeruginosa PCC7806 was significantly reduced under P-deficient conditions, and its photosynthetic activity in terms of rETR(max) (maximum electron transport rate) decreased significantly after 48 h growth, while it kept elevating and reached to a relative stable value when supplied with rich phosphorus of 0.6 mg/L With the increasing actinic irradiance along the rapid light curves of M. aeruginosa PCC7806 cultured under low-phosphorus level, qP (photochemical quenching) and rETR (relative electron transport rate) decreased greatly, and the increase in qN (non-photochemical quenching) and Phi(ps) (actual photochemical efficiency of PSII) was obviously inhibited. The affinity of M. aeruginosa PCC7806 to inorganic carbon was reduced evidently in 0.02 mg/L P compared with in 0.6 mg/L P. When P was reduced from 0.6 to 0.02 mg/L, the decreasing rate of rETR(max) (77%) was significantly greater than that of photosynthetic carbon assimilation (22%), which indicated that down-regulation of CO2 affinity caused by P-deficiency was, but not the only reason that resulted in the decline of photosynthetic efficiency. Instantaneous low-temperature significantly limited rETR(max) under rich-P condition but had no effect on it when P was insufficient, and 1% ethanol could enhance rETR(max) at low-P level but did not influence it at rich-P level. These two results proved that the decrease in thylakoid membrane fluidity caused by P-deficiency was another important reason that results in the decline of photosynthetic efficiency of M. aruginosa PCC7806. (c) 2010 Elsevier B.V. All rights reserved.
英文摘要: Photosynthetic response of Microcystis aeruginosa PCC7806 to different concentrations of phosphorus supply was studied so as to elucidate if the declining process of Microcystis bloom under freshwater ecosystem is related to soluble reactive phosphorus (SRP) decrease in water volume. Growth rate of M. aeruginosa PCC7806 was significantly reduced under P-deficient conditions, and its photosynthetic activity in terms of rETR(max) (maximum electron transport rate) decreased significantly after 48 h growth, while it kept elevating and reached to a relative stable value when supplied with rich phosphorus of 0.6 mg/L With the increasing actinic irradiance along the rapid light curves of M. aeruginosa PCC7806 cultured under low-phosphorus level, qP (photochemical quenching) and rETR (relative electron transport rate) decreased greatly, and the increase in qN (non-photochemical quenching) and Phi(ps) (actual photochemical efficiency of PSII) was obviously inhibited. The affinity of M. aeruginosa PCC7806 to inorganic carbon was reduced evidently in 0.02 mg/L P compared with in 0.6 mg/L P. When P was reduced from 0.6 to 0.02 mg/L, the decreasing rate of rETR(max) (77%) was significantly greater than that of photosynthetic carbon assimilation (22%), which indicated that down-regulation of CO(2) affinity caused by P-deficiency was, but not the only reason that resulted in the decline of photosynthetic efficiency. Instantaneous low-temperature significantly limited rETR(max) under rich-P condition but had no effect on it when P was insufficient, and 1% ethanol could enhance rETR(max) at low-P level but did not influence it at rich-P level. These two results proved that the decrease in thylakoid membrane fluidity caused by P-deficiency was another important reason that results in the decline of photosynthetic efficiency of M. aruginosa PCC7806. (c) 2010 Elsevier B.V. All rights reserved.
关键词[WOS]: RIBULOSE 1,5-BISPHOSPHATE CARBOXYLASE ; CHLOROPHYLL FLUORESCENCE ; EXCITATION-ENERGY ; PHOTOSYSTEM-II ; IN-VIVO ; CYANOBACTERIUM ; PHYCOBILISOMES ; TEMPERATURE ; MEMBRANES ; PHOSPHATE
语种: 英语
WOS记录号: WOS:000281999300011
ISSN号: 1568-9883
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/13681
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Recommended Citation:
Wang, Zhicong; Li, Dunhai; Li, Guowen; Liu, Yongding.Mechanism of photosynthetic response in Microcystis aeruginosa PCC7806 to low inorganic phosphorus,HARMFUL ALGAE,2010,9(6):613-619
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