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学科主题: Plant Sciences; Marine & Freshwater Biology
题名: Daily timing of emersion and elevated atmospheric CO2 concentration affect photosynthetic performance of the intertidal macroalga Ulva lactuca (Chlorophyta) in sunlight
作者: Zou, Dinghui1; Gao, Kunshan1, 2; Ruan, Zuoxi1
通讯作者: Zou, DH, Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
关键词: CO2 ; emersion ; photosynthesis ; tidal rhythm ; Ulva lactuca
刊名: BOTANICA MARINA
发表日期: 2007
DOI: 10.1515/BOT.2007.031
卷: 50, 期:5-6, 页:275-279
收录类别: SCI
文章类型: Article
部门归属: [Zou, Dinghui; Gao, Kunshan; Ruan, Zuoxi] Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China; [Gao, Kunshan] Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Plant Sciences ; Marine & Freshwater Biology
研究领域[WOS]: Plant Sciences ; Marine & Freshwater Biology
摘要: The lunar day differs in length from the solar day so that times of low tide vary from day to day. Thus, aerial exposure of intertidal seaweeds may be during the day or during the night. We measured photosynthetic CO, assimilation rates of the intertidal green macroalga Ulva lactuca during exposures of varied daily timings during sunny days of summer to establish how photosynthetic performance responds to emersion timing under varied CO2 levels [at ambient (360 ppmv) and 2x ambient (720 ppmv) atmospheric CO2 concentrations]. There was an increase in net photosynthetic rates following some duration of exposure when the initial timing of exposure occurred during early morning (06.30 h) and late afternoon (17.15 h). In contrast, net rates exhibited a sharp decline with exposure duration when the initial timing of exposure occurred at 09.30 h, 15.30 h and especially at noon (12.30 h), implying the occurrence of a severe photoinhibition resulting from mid-day insolation. Doubled atmospheric CO2 concentration significantly enhanced the emersed photosynthetic rates, indicating that the emersed photosynthesis is CO2-limited at ambient CO2 levels. However, increasing CO2 barely stimulates the emersed photosynthetic rates during mid-day insolation.
英文摘要: The lunar day differs in length from the solar day so that times of low tide vary from day to day. Thus, aerial exposure of intertidal seaweeds may be during the day or during the night. We measured photosynthetic CO, assimilation rates of the intertidal green macroalga Ulva lactuca during exposures of varied daily timings during sunny days of summer to establish how photosynthetic performance responds to emersion timing under varied CO2 levels [at ambient (360 ppmv) and 2x ambient (720 ppmv) atmospheric CO2 concentrations]. There was an increase in net photosynthetic rates following some duration of exposure when the initial timing of exposure occurred during early morning (06.30 h) and late afternoon (17.15 h). In contrast, net rates exhibited a sharp decline with exposure duration when the initial timing of exposure occurred at 09.30 h, 15.30 h and especially at noon (12.30 h), implying the occurrence of a severe photoinhibition resulting from mid-day insolation. Doubled atmospheric CO2 concentration significantly enhanced the emersed photosynthetic rates, indicating that the emersed photosynthesis is CO2-limited at ambient CO2 levels. However, increasing CO2 barely stimulates the emersed photosynthetic rates during mid-day insolation.
关键词[WOS]: MARINE MACROALGAE ; INORGANIC CARBON ; SOLAR-RADIATION ; FUCUS-SPIRALIS ; PHOTOINHIBITION ; DESICCATION ; PORPHYRA ; WATER ; AIR ; RHODOPHYTA
语种: 英语
WOS记录号: WOS:000253095600003
ISSN号: 0006-8055
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/8268
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China

Recommended Citation:
Zou, Dinghui; Gao, Kunshan; Ruan, Zuoxi.Daily timing of emersion and elevated atmospheric CO2 concentration affect photosynthetic performance of the intertidal macroalga Ulva lactuca (Chlorophyta) in sunlight,BOTANICA MARINA,2007,50(5-6):275-279
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