标题：UV-B resistance as a criterion for the selection of desert microalgae to be utilized for inoculating desert soils作者：Chen, Lanzhou;Deng, Songqiang; De Philippis, Roberto; Tian, Weiqun; Wu,
Hao; Wang, Jiao
来源出版物：JOURNAL OF APPLIED PHYCOLOGY 卷：25 期：4 页：1009-1015 DOI：10.1007/s10811-012-9906-1出版年：AUG 2013
摘要：The adaption capability of microalgae species to intense UV-B radiation is an important feature for their survival under the harsh growth conditions they have to face when used for inoculating unconsolidated sand soils in desert areas. In this study, the responses of photosynthetic activity, reactive oxygen species (ROS) generation, and DNA strand breaks to UV-B radiation in four microalgae isolated from artificially induced biological soil crusts were investigated. It was found that low UV-B doses easily inhibited the photosynthetic activity and induced serious DNA damage in Chlorella vulgaris. Microcoleus vaginatus showed the capability to withstand only moderate doses of UV-B, while Nostoc was capable of facing high doses of UV-B due to its lower generation of ROS and higher capability to repair photosystem II (PSII) and DNA damages. On the other hand, Scytonema javanicum showed additional strategies to survive UV-B irradiance, namely the closure of PSII when ROS generation increased rapidly, in addition to a high repair ability of PSII and DNA damage. The results obtained point out different resistance and defense mechanisms of the four microalgae in response to UV-B irradiance and suggest that the strain of Nostoc sp. tested is the most suitable for surviving under the high UV irradiation levels typical of desertified areas.
作者关键词：UV-B radiation, Biological soil crusts, Photosynthetic efficiency, Tolerance, Repairing ability
扩展关键词：CYANOBACTERIUM MICROCOLEUS-VAGINATUS; INDUCED DNA-DAMAGE; SIGNAL-TRANSDUCTION; OXIDATIVE STRESS;ALGAL CRUSTS; RADIATION;EXOPOLYSACCHARIDES;PHOTOINHIBITION;SCYTONEMIN; TOLERANCE
通讯作者地址：陈兰洲(Chen, Lanzhou);Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm B, Wuhan 430079, Peoples R China.
[Chen, Lanzhou; Deng, Songqiang; Wu, Hao; Wang, Jiao] Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm B, Wuhan 430079, Peoples R China.
[De Philippis, Roberto] Univ Florence, Dept Agr Biotechnol, I-50144 Florence, Italy.
[Tian, Weiqun] Wuhan Univ, Dept Biomed Engn, Sch Basic Med Sci, Wuhan 430079, Peoples R China.
研究方向：Biotechnology & Applied Microbiology; Marine & Freshwater Biology
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