Enhanced Resistance to UV-B Radiation in Anabaena sp PCC 7120 (Cyanophyceae) by Repeated Exposure

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	Enhanced Resistance to UV-B Radiation in Anabaena sp PCC 7120 (Cyanophyceae) by Repeated Exposure
	Qin, Hongjie 1,2; Li, Dunhai 1
刊名	CURRENT MICROBIOLOGY
	2014-07-01
卷号	69 期号:1 页码:1-9
关键词	ULTRAVIOLET-RADIATION HETEROCYST DEVELOPMENT PHOTOSYNTHESIS TEMPERATURE CYANOBACTERIA NITROGEN PLANTS DAMAGE OZONE EUTROPHICATION
ISSN号	0343-8651
通讯作者	Li, DH (reprint author), Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China.
中文摘要	In natural habitats, organisms especially phytoplankton are not always continuously subjected to ultraviolet-B radiation (UVBR). By simulation of the natural situation, the N-2-fixing cyanobacterium Anabaena sp. PCC 7120 was subjected to UV-B exposure and recovery cycles. A series of morphological and physiological changes were observed in Anabaena sp. PCC 7120 under repeated UVBR when compared with controls. Such as the breakage of filaments, intervals between heterocysts, heterocyst frequency, total carbohydrate, and carotenoids were increased, while the nitrogenase activity and photosynthetic activity were inhibited by repeated UVBR; however, these activities could recover when UV-B stress was removed. Unexpectedly, the over-compensatory growth was observed at the end of the second round of exposure and recovery cycle. Our results showed that discontinuous UVBR could increase the growth rate and the tolerance as well as repair capacity of Anabaena sp. PCC 7120. These results indicate that moderate UVBR may increase the growth of cyanobacteria in natural habitats.
英文摘要	In natural habitats, organisms especially phytoplankton are not always continuously subjected to ultraviolet-B radiation (UVBR). By simulation of the natural situation, the N-2-fixing cyanobacterium Anabaena sp. PCC 7120 was subjected to UV-B exposure and recovery cycles. A series of morphological and physiological changes were observed in Anabaena sp. PCC 7120 under repeated UVBR when compared with controls. Such as the breakage of filaments, intervals between heterocysts, heterocyst frequency, total carbohydrate, and carotenoids were increased, while the nitrogenase activity and photosynthetic activity were inhibited by repeated UVBR; however, these activities could recover when UV-B stress was removed. Unexpectedly, the over-compensatory growth was observed at the end of the second round of exposure and recovery cycle. Our results showed that discontinuous UVBR could increase the growth rate and the tolerance as well as repair capacity of Anabaena sp. PCC 7120. These results indicate that moderate UVBR may increase the growth of cyanobacteria in natural habitats.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Microbiology
研究领域[WOS]	Microbiology
关键词[WOS]	ULTRAVIOLET-RADIATION ; HETEROCYST DEVELOPMENT ; PHOTOSYNTHESIS ; TEMPERATURE ; CYANOBACTERIA ; NITROGEN ; PLANTS ; DAMAGE ; OZONE ; EUTROPHICATION
收录类别	SCI
资助信息	National Major Program of Water Body Pollution Control and Remediation [2012ZX07103003-02]
语种	英语
WOS记录号	WOS:000336396500001
公开日期	2014-08-08
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/20061]
专题	水生生物研究所_水环境工程研究中心_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qin, Hongjie,Li, Dunhai. Enhanced Resistance to UV-B Radiation in Anabaena sp PCC 7120 (Cyanophyceae) by Repeated Exposure[J]. CURRENT MICROBIOLOGY,2014,69(1):1-9.
APA	Qin, Hongjie,&Li, Dunhai.(2014).Enhanced Resistance to UV-B Radiation in Anabaena sp PCC 7120 (Cyanophyceae) by Repeated Exposure.CURRENT MICROBIOLOGY,69(1),1-9.
MLA	Qin, Hongjie,et al."Enhanced Resistance to UV-B Radiation in Anabaena sp PCC 7120 (Cyanophyceae) by Repeated Exposure".CURRENT MICROBIOLOGY 69.1(2014):1-9.