干旱区生态环境知识资源中心(Arid): UV-B辐射及光修复对真藓生理特性和细胞超微结构的影响

Arid

	UV-B辐射及光修复对真藓生理特性和细胞超微结构的影响
其他题名	Effects of UV-B radiation and light recovery on physiological property and cell ultrastructure of Bryum argenteum
	回嵘 1; 赵锐明 2; 李刚 1; 朱瑞清 1; 王艳莉 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:11 页码:3450-3458
中文摘要	研究了UV-B增强及可见光修复对真藓生理特性和细胞超微结构的影响。结果表明,增强UV-B会使真藓的光合色素、类黄酮含量及抗氧化酶活性下降,丙二醛(MDA)含量升高,细胞超微结构遭到破坏,表现为叶绿体结构变形,类囊体片层排列稀疏紊乱、膨胀甚至模糊不清,嗜锇颗粒增多,并且UV-B辐射强度越大,损伤越大;而可见光可以部分修复增强UV-B对真藓生理特性及细胞超微结构引起的损伤。研究探索了真藓对UV-B辐射的响应及自身修复能力,对于进一步理解真藓对UV-B辐射的耐受机理具有重要的理论意义。
英文摘要	Over the last several decades,significant reductions in the concentrations of stratospheric ozone (O3) have been reported. The reduced ozone concentration causes an increase in the UV-B radiation that reaches the earth’s surface; this is one of the most important environment problems worldwide. Although UV-B radiation accounts for only about 1.5% of total solar radiation,it is readily absorbed by biomacromolecules,with the result that increased UV-B radiation inhibits the growth of most plants. Biological soil crusts (BSCs) are complex assemblages of minute organisms that are formed primarily by cyanobacteria,green algae,lichens,and mosses on the surface of soil. Previous studies have shown that increased UV-B radiation has detrimental effects on BSCs. However,we observed that they can recover from UV-B stress,and still flourish in desert regions. Moss crust has great ecological significance in desert areas,where it is the dominant component of BSCs, and a major pioneer species in community succession processes. In desert ecosystems,plant life is damaged as a result of adverse environmental conditions,such as strong light,extreme temperature,salinity,and water deficit. Several studies have examined the effects of environmental factors on the species composition and physiological properties of BSCs. However,fewer studies have addressed the recovery mechanisms of BSCs after they are subjected to environmental stresses. We used UV-B radiation (2.75,3.08,3.25 and 3.41 W/m~2) to simulate the depletion of 0% (control),6%,9% and 12% of stratospheric ozone at the latitude of Shapotou region and recovery after a return to visible-light conditions (150 mumol m-2 s-1) and evaluated the effects of this exposure on physiological variables and cell ultrastructure in the moss Bryum argenteum,which we isolated from BSCs in the Tengger Desert in northern China. The results indicated that the photosynthetic pigments content,flavonoid content,and antioxidant enzyme activity in B. argenteum decreased,while malondialdehyde (MDA) content increased after exposure to UV-B radiation. The ultrastructure of the chloroplasts of B. argenteum subjected to enhanced UV-B was significantly disrupted,as follows: the chloroplast structure was distorted, the arrangement of the thylakoids in the chloroplast was disordered,expanded or even obscured,and the number of osmiophilic granules increased. The degree of damage increased with increasing UV-B radiation. However,visible light could partially repair damage induced by enhanced UV-B radiation. The aim of the present study was to discuss the responses of B. argenteum to UV-B radiation and its repair capabilities,and to improve the understanding of the mechanisms of the tolerance of B. argenteum to UV-B radiation.
中文关键词	真藓 ; 光合色素 ; 叶绿体超微结构 ; 光修复
英文关键词	UV-B UV-B Bryum argenteum photosynthetic pigments chloroplast ultrastructure light recovery
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5725164
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234787
作者单位	1.中国科学院寒区旱区环境与工程研究所, 中国科学院沙坡头沙漠试验研究站, 兰州, 甘肃 730000, 中国; 2.兰州大学,生命科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	回嵘,赵锐明,李刚,等. UV-B辐射及光修复对真藓生理特性和细胞超微结构的影响[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2016,36(11):3450-3458.
APA	回嵘,赵锐明,李刚,朱瑞清,&王艳莉.(2016).UV-B辐射及光修复对真藓生理特性和细胞超微结构的影响.生态学报,36(11),3450-3458.
MLA	回嵘,et al."UV-B辐射及光修复对真藓生理特性和细胞超微结构的影响".生态学报 36.11(2016):3450-3458.