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题名: Heterogeneity of buoyancy in response to light between two buoyant types of cyanobacterium Microcystis
作者: Xiao, Yan1, 2; Gan, Nanqin1; Liu, Jin1; Zheng, Lingling1; Song, Lirong1
通讯作者: Song, LR (reprint author), Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
关键词: Buoyancy ; Colonial Microcystis ; Heterogeneity ; Light ; Vertical migration
刊名: HYDROBIOLOGIA
发表日期: 2012
DOI: 10.1007/s10750-011-0894-y
卷: 679, 期:1, 页:297-311
收录类别: SCI
文章类型: Article
部门归属: [Xiao, Yan; Gan, Nanqin; Liu, Jin; Zheng, Lingling; Song, Lirong] Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Xiao, Yan] Chinese Acad Sci, Grad Sch, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National Key Project for Basic Research[2008CB418001, 2008CB418006]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]
类目[WOS]: Marine & Freshwater Biology
研究领域[WOS]: Marine & Freshwater Biology
摘要: Previous investigations suggested that buoyancy state in response to light differed between individuals within natural populations of cyanobacteria. To understand the mechanisms of heterogeneity of buoyancy in different species/strains in relation to light, two types of colonial Microcystis in different buoyancy behavior were selected and used to compare their photosynthetic activity, gas vesicle volume, ballast mass, and migration at varying light regime. The photosynthesis-irradiance curve and F (v)/F (m) examination indicated that negatively buoyant strains were more adapted at high irradiance than buoyant ones. Transcription levels of gvp gene and gas vesicle volume decreased in buoyant strains, but increased in negatively buoyant ones at high irradiance. The results indicated that the combination effect of decrease in gas vesicle buoyancy and increase in carbohydrate contributed to the downward migration of buoyant strains, while the significant increase of gas vesicles provided sufficient buoyancy to negate ballast mass, resulting in the upward migration of negatively buoyant ones at high irradiance. In addition, either sinking or floating velocities were elevated in buoyant and negatively buoyant strains, coincidently with the colony enlargement of all strains at high irradiance, respectively. These findings suggest that this heterogeneity was associated with the interplay between gas vesicles, ballast, and colony size. The fact that different species/strains of Microcystis respond diversely to light depending on their physiological conditions presents a good example to understand heterogeneity of buoyancy in the field, and the presence of heterogeneity of buoyancy may be implicated in the dominancy and persistence of Microcystis bloom in ever-changing environment.
英文摘要: Previous investigations suggested that buoyancy state in response to light differed between individuals within natural populations of cyanobacteria. To understand the mechanisms of heterogeneity of buoyancy in different species/strains in relation to light, two types of colonial Microcystis in different buoyancy behavior were selected and used to compare their photosynthetic activity, gas vesicle volume, ballast mass, and migration at varying light regime. The photosynthesis-irradiance curve and F (v)/F (m) examination indicated that negatively buoyant strains were more adapted at high irradiance than buoyant ones. Transcription levels of gvp gene and gas vesicle volume decreased in buoyant strains, but increased in negatively buoyant ones at high irradiance. The results indicated that the combination effect of decrease in gas vesicle buoyancy and increase in carbohydrate contributed to the downward migration of buoyant strains, while the significant increase of gas vesicles provided sufficient buoyancy to negate ballast mass, resulting in the upward migration of negatively buoyant ones at high irradiance. In addition, either sinking or floating velocities were elevated in buoyant and negatively buoyant strains, coincidently with the colony enlargement of all strains at high irradiance, respectively. These findings suggest that this heterogeneity was associated with the interplay between gas vesicles, ballast, and colony size. The fact that different species/strains of Microcystis respond diversely to light depending on their physiological conditions presents a good example to understand heterogeneity of buoyancy in the field, and the presence of heterogeneity of buoyancy may be implicated in the dominancy and persistence of Microcystis bloom in ever-changing environment.
关键词[WOS]: PHOSPHATE-LIMITED CULTURES ; BLOOM-FORMING MICROCYSTIS ; GAS VESICLE COLLAPSE ; ANABAENA-FLOS-AQUAE ; VERTICAL MIGRATION ; TURGOR PRESSURE ; CELL BUOYANCY ; AERUGINOSA ; LAKE ; PHYTOPLANKTON
语种: 英语
WOS记录号: WOS:000297620100020
ISSN号: 0018-8158
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/16777
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.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Wuhan 430072, Peoples R China

Recommended Citation:
Xiao, Yan; Gan, Nanqin; Liu, Jin; Zheng, Lingling; Song, Lirong.Heterogeneity of buoyancy in response to light between two buoyant types of cyanobacterium Microcystis,HYDROBIOLOGIA,2012,679(1):297-311
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