| 荒漠念珠藻对UV-B辐射的反应及外源抗氧化剂的保护作用 |
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| 引用本文： | 邓松强,杨翠琨,安晓亮,胡超珍,陈兰洲.荒漠念珠藻对UV-B辐射的反应及外源抗氧化剂的保护作用[J].干旱区研究,2012,29(5):816-819. |
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| 作者姓名： | 邓松强 杨翠琨 安晓亮 胡超珍 陈兰洲 |
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| 作者单位： | 1. 武汉大学资源与环境科学学院，湖北 武汉 430072; 2. 达拉特旗国营白土梁农场，内蒙古 达拉特旗 014300; ;
3. 内蒙古自治区林业科学研究院，内蒙古 呼和浩特 010020 |
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| 基金项目： | 武汉市科技晨光计划项目，国家自然科学基金 |
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| 摘 要： | 通过分析UV-B辐射对荒漠结皮中的藻类--Nostoc sp.生物学效应的影响，以及外源抗氧化剂对UV-B辐射下藻类的保护作用。结果表明：Nostoc sp.的光合活性WTBX](Fv/Fm)WTBZ]随紫外处理强度的增大和处理时间的延长而显著降低，叶绿素荧光产量和相应光合参数（ET0/ABS、ET0/TR0和RC/CS0）降低，活性氧ROS（reactive oxygen evolution）产量显著增加，光合活性降低。而外源抗坏血酸（ASA）和半胱氨酸（NAC）的加入，可以显著提高紫外辐射条件下藻体的光合活性，降低ROS含量，从而有效保护藻类，且抗坏血酸的效果要优于半胱氨酸。实验结果表明：处于藻类结皮上层的Nostoc sp.有较强的对UV-B辐射的抗性，而外源抗氧化剂可以有效保护藻体免受紫外辐射的伤害。
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| 关 键 词： | UV 辐射 荒漠 生物结皮 蓝藻 光合活性 活性氧 |
| 收稿时间： | 2011-11-09; |
Response of Nostoc sp. to UV-B Radiation and the Protective Effect of Exogenous Antioxidants to Nostoc sp. |
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| DENG Song-qiang,YANG Cui-kun,AN Xiao-liang,HU Chao-zhen,CHEN Lan-zhou.Response of Nostoc sp. to UV-B Radiation and the Protective Effect of Exogenous Antioxidants to Nostoc sp.[J].Arid Zone Research,2012,29(5):816-819. |
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| Authors: | DENG Song-qiang YANG Cui-kun AN Xiao-liang HU Chao-zhen CHEN Lan-zhou |
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| Institution: | 1. College of Resources & Environmental Sciences, Wuhan University, Wuhan 430072, China;;
2. Baituliang State Farm, Dalat Banner 014300, Inner Mongolia, China;;
3. Inner Mongolia Academy of Forestry, Hohhot 010020, China |
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| Abstract: | In this paper,the effects of UV-B radiation on the physiological and biochemical processes of Nostoc sp.,one of cyanobacteria isolated from desert algal crust,were investigated,and the protective effects of ascorbic acid and N-acetyl-L-cysteine were researched.The results show that the PSII activity(Fv/Fm) of stressed cells was significantly decreased with the increase of irradiance time and intensity,the chlorophyll fluorescence transits and photosynthetic parameters(ET0/ABS、ET0/TR0 and RC/CS0) were also decreased significantly,but the ROS generation was increased.Exogenous 0.5 mM ascorbic acid or N-acetyl-L-cysteine could significantly decrease the production of ROS(reactive oxygen evolution),and the protective effect of ascorbic acid was better than that of N-acetyl-L-cysteine.The results suggested that Nostoc sp.adapted to the detrimental UV environment in desert,and exogenous antioxidant could effectively protect cells from UV-B damage. |
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| Keywords: | species UV-B radiation desert biological crusts cyanobacterium photosynthesis efficiency reactive oxy-(ROS) |
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