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学科主题: Ecology ; Marine & Freshwater Biology
题名: Effect of nitrate enrichment and salinity reduction on the seagrass Thalassia hemprichii previously grown in low light
作者: [Jiang, Zhijian ; Huang, Xiaoping ; Zhang, Jingping] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [Jiang, Zhijian ; Zhang, Jingping] Chinese Acad Sci, Trop Marine Biol Res Stn Hainan, Sanya 572200, PR, Peoples R China
通讯作者: xphuang@scsio.ac.cn
关键词: Enzymatic activity ; Growth ; Nitrate enrichment ; Salinity reduction ; Seagrass ; Thalassia hemprichii
刊名: JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
发表日期: 2013
卷: 443, 页:114-122
部门归属: LTO
资助者: This research was supported by the National Natural Science Foundation of China (nos. 41076069 and 40776086), the Project of Environmental Quality Evaluation of Seagrass Bed in South China Sea (no. DOMEP (MEA)-01-03), the Public Science and Technology Research Funds Projects of Ocean (no. 201305030), and the Knowledge Innovation Program of the Chinese Academy of Sciences (no. SQ201219). We express our thanks to Mr Li Lei and Feng Shaohui for their help in field sampling. We also would like to thank the editors and reviewers for their comments and suggestions to the manuscript.
摘要: A sub-acute experiment that tested carbon and nitrogen metabolisms and the plant's antioxidant defence system was used to investigate the effects of nitrate enrichment and salinity reduction on the tropical seagrass Thalassia hemprichii that had previously been grown in low light conditions. Shading significantly reduced leaf growth rate, nitrate reductase activity and non-structural carbohydrate (NSC) content in both aboveground and belowground tissues, but enhanced superoxide dismutase and guaiacol peroxidase (POD) activities and free amino acids in aboveground tissue. After shade removal, salinity reduction with pre-shading decreased minimum fluorescence and maximum fluorescence under all nitrate conditions. Pre-shading aggravated the negative effect of nitrate enrichment and salinity reduction on leaf growth rate. Nitrate enrichment led to a greater reduction in NSC in aboveground tissues of pre-shading plants compared to the control. Furthermore, salinity reduction with pre-shading even induced effective NSC translocation from belowground to aboveground tissues. Nitrate enrichment and salinity reduction both increased POD activity in T. hemprichii grown previously in low light. Therefore, pre-shading increases the vulnerability of T. hemprichii to eutrophication and hyposalinity, which must be considered when predicting future responses and effective management of seagrass resources. (C) 2013 Elsevier B.V. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000320425700013
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10912
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Jiang, Zhijian; Huang, Xiaoping; Zhang, Jingping] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Jiang, Zhijian; Zhang, Jingping] Chinese Acad Sci, Trop Marine Biol Res Stn Hainan, Sanya 572200, PR, Peoples R China.Effect of nitrate enrichment and salinity reduction on the seagrass Thalassia hemprichii previously grown in low light,JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY,2013,443():114-122
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