干旱区生态环境知识资源中心(Arid): Nitrogen concentration acting as an environmental signal regulates cyanobacterial EPS excretion

Arid

DOI	10.1016/j.chemosphere.2021.132878
	Nitrogen concentration acting as an environmental signal regulates cyanobacterial EPS excretion
	Qian, Long; Ye, Xingwang; Xiao, Jingshang; Lin, Simeng; Wang, Hongyu; Liu, Zhe; Ma, Yongfei; Yang, Lie; Zhang, Zulin; Wu, Li
通讯作者	Wu, L (corresponding author)，Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430072, Peoples R China.
来源期刊	CHEMOSPHERE
ISSN	0045-6535
EISSN	1879-1298
出版年	2022
卷号	291
英文摘要	As an important carbon (C) storage in biological soil crusts (BSCs), exopolysaccharides (EPSs) are not only a part of the desert C cycle, but also the key materials for cyanobacteria to resist desert stress. In this study, the influence of initial N concentrations (10, 25 and 50 mg L-1 designated as N10, N25 and N50 respectively) on Microcoleus vaginatusis growth and the excretion of EPSs including RPS (released exopolysaccharides) and CPS (capsule exopolysaccharides) were evaluated at different growth periods. In logarithmic period, higher ratio of biomass to EPSs indicated by (DW-CPS)/EPSs was observed in the N50 group with the highest N concentration (about 40 mg L-1) in the medium, while no difference was observed among the three groups in stationary period when the N concentrations of medium were lower than 25 mg L-1. The CPS/RPS showed similar results with (DW-CPS)/EPSs, and stayed higher than 1 in each group. Notably, obvious difference displayed in the monosaccharidic composition and morphologies between CPS and RPS, but not the N levels. The changes of C/N in cells at different growth period indicate that the excretion of EPSs, a mechanism that maintains the balance of cell C/N ratio, only works when the N in the environment is sufficient. Our results showed that, as the raw material and environmental signal, environmental N concentration regulates the elements (C and N) percentage of cyanobacterial cells and its EPSs excretion pattern, but not the monosaccharidic composition or the morphologies. These results also implied that, as the essential self-protecting materials, more EPSs with higher proportion of CPS would be excreted to response the low N environment.
英文关键词	Microcoleus vaginatus Nitrogen EPSs Monosaccharidic composition AFM
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000758003900005
WOS关键词	EXTRACELLULAR POLYMERIC SUBSTANCES ; BIOLOGICAL SOIL CRUSTS ; EXOCELLULAR POLYSACCHARIDES ; TOPOGRAPHICAL STRUCTURES ; DESICCATION TOLERANCE ; MICROCOLEUS-VAGINATUS ; PHOTOTROPHIC BIOFILMS ; BIODIESEL PRODUCTION ; SEMIARID ECOSYSTEMS ; LIGHT-INTENSITY
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376226
作者单位	[Qian, Long; Ye, Xingwang; Xiao, Jingshang; Lin, Simeng; Wang, Hongyu; Liu, Zhe; Ma, Yongfei; Yang, Lie; Zhang, Zulin; Wu, Li] Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430072, Peoples R China; [Zhang, Zulin] James Hutton Inst, Aberdeen AB15 8QH, Scotland
推荐引用方式 GB/T 7714	Qian, Long,Ye, Xingwang,Xiao, Jingshang,et al. Nitrogen concentration acting as an environmental signal regulates cyanobacterial EPS excretion[J],2022,291.
APA	Qian, Long.,Ye, Xingwang.,Xiao, Jingshang.,Lin, Simeng.,Wang, Hongyu.,...&Wu, Li.(2022).Nitrogen concentration acting as an environmental signal regulates cyanobacterial EPS excretion.CHEMOSPHERE,291.
MLA	Qian, Long,et al."Nitrogen concentration acting as an environmental signal regulates cyanobacterial EPS excretion".CHEMOSPHERE 291(2022).