Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus

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	Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus
	Wu, Juan; Cheng, Shuiping; Liang, Wei; He, Feng; Wu, Zhenbin
刊名	HYDROBIOLOGIA
	2009-07-01
卷号	628 期号:1 页码:111-119
关键词	Sediment anoxia Light Turion germination Growth Potamogeton crispus
ISSN号	0018-8158
通讯作者	Wu, ZB, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
中文摘要	Potamogeton crispus is a cosmopolitan aquatic species and is widely used as a pioneer species for vegetation restoration of eutrophic lakes. However, many restoration projects applying P. crispus turions have not been successful. Earlier studies focused on effects of light and temperature on turion germination. The purpose of this study was to determine whether sediment anoxia and light interactively affected the turion germination and early growth of P. crispus. Anoxic conditions in the experiment were produced by adding sucrose to the sediment. The germination rate of the turions was 68-73% lower in the highly anoxic condition treatment than in the control. Medium light intensity (10% of natural light at the water surface) was more favorable for germination under slightly anoxic conditions than either low or high light intensity. The growth of newly-formed sprouts was also significantly inhibited by sediment anoxia. Photosynthesis and shoot biomass were reduced under sediment anoxia, whereas total chlorophyll content, root biomass, and soluble protein content were highest in the low anoxic condition treatment. Medium light improved net photosynthesis and biomass production of the sprouts. We conclude that turion germination and sprout growth can be significantly inhibited by sediment anoxia. Medium light intensity may alleviate this inhibition by anoxia, but light has little effect when sediment anoxia is severe. For the purposes of vegetation restoration, more attention should be paid to the role of sediment anoxia, and it is necessary to improve sediment and light conditions for turion germination and early growth of P. crispus in eutrophic lakes. These results will contribute to a more complete understanding of turion germination dynamics of P. crispus and will be useful for future restoration programs.
英文摘要	Potamogeton crispus is a cosmopolitan aquatic species and is widely used as a pioneer species for vegetation restoration of eutrophic lakes. However, many restoration projects applying P. crispus turions have not been successful. Earlier studies focused on effects of light and temperature on turion germination. The purpose of this study was to determine whether sediment anoxia and light interactively affected the turion germination and early growth of P. crispus. Anoxic conditions in the experiment were produced by adding sucrose to the sediment. The germination rate of the turions was 68-73% lower in the highly anoxic condition treatment than in the control. Medium light intensity (10% of natural light at the water surface) was more favorable for germination under slightly anoxic conditions than either low or high light intensity. The growth of newly-formed sprouts was also significantly inhibited by sediment anoxia. Photosynthesis and shoot biomass were reduced under sediment anoxia, whereas total chlorophyll content, root biomass, and soluble protein content were highest in the low anoxic condition treatment. Medium light improved net photosynthesis and biomass production of the sprouts. We conclude that turion germination and sprout growth can be significantly inhibited by sediment anoxia. Medium light intensity may alleviate this inhibition by anoxia, but light has little effect when sediment anoxia is severe. For the purposes of vegetation restoration, more attention should be paid to the role of sediment anoxia, and it is necessary to improve sediment and light conditions for turion germination and early growth of P. crispus in eutrophic lakes. These results will contribute to a more complete understanding of turion germination dynamics of P. crispus and will be useful for future restoration programs.
学科主题	Marine & Freshwater Biology
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Marine & Freshwater Biology
研究领域[WOS]	Marine & Freshwater Biology
关键词[WOS]	ZOSTERA-MARINA ; SULFIDE ; MACROPHYTES ; SEAGRASS ; EELGRASS ; OXYGEN ; LAKE ; PHOTOSYNTHESIS ; IRRADIANCE ; EVENTS
收录类别	SCI
资助信息	Chinese Academy of Sciences [KZCX2-YW-426]; Project of National Major Program of Science and Technology [2008ZX07316-004]
语种	英语
WOS记录号	WOS:000266007900008
公开日期	2010-10-13
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/152342/7754]
专题	水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文
作者单位	Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Wu, Juan,Cheng, Shuiping,Liang, Wei,et al. Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus[J]. HYDROBIOLOGIA,2009,628(1):111-119.
APA	Wu, Juan,Cheng, Shuiping,Liang, Wei,He, Feng,&Wu, Zhenbin.(2009).Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus.HYDROBIOLOGIA,628(1),111-119.
MLA	Wu, Juan,et al."Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus".HYDROBIOLOGIA 628.1(2009):111-119.