UV-B辐射增强对芦苇光合生理及叶绿体超微结构的影响  

Effects of enhanced UV-B radiation on photosynthetic physiology and chloroplast ultrastructure of Phragmites australis

作　　者：褚润[1] 陈年来[1] CHU Run;CHEN Nian-lai(College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China)

机构地区：[1]甘肃农业大学资源与环境学院,兰州730070

出　　处：《应用生态学报》2017年第11期3515-3520,共6页Chinese Journal of Applied Ecology

基　　金：甘肃省重点研发计划项目(1504FKCA003)资助~~

摘　　要：在UV-B辐照增强条件下,研究不同辐照梯度对芦苇光合特性、光合色素含量及叶绿体超微结构的影响.结果表明:与自然光照相比,UV-B辐照增强显著降低芦苇叶片净光合速率、气孔导度、蒸腾速率,且随辐照强度增大,降低程度加剧,胞间CO2浓度升高,光合效率显著降低;与自然光照相比,UV-B辐照增强显著降低芦苇叶片光合色素含量(包括叶绿素a、叶绿素b、总叶绿素和类胡萝卜素),且随辐照强度增大,降低程度加剧;UV-B辐射增强条件下,叶绿体超微结构遭到破坏,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,并且UV-B辐射强度越大,损伤越大,高强度UV-B辐射对叶绿体超微结构的影响大于低强度辐射.The effects of different intensities of UV-B radiation on photosynthetic characteristics,photosynthetic pigment content and chloroplast ultrastructure of Phragmites australis were studied in this paper. The results showed that enhanced UV-B radiation significantly reduced the net photosynthetic rate,stomatal conductance and transpiration rate,and the degree of degradation increased with the increasing irradiation intensity. The intercellular CO2 content increased and the photosynthetic efficiency decreased significantly compared with the control. Enhanced UV-B radiation decreased photosynthetic pigment contents,including chlorophyll a,chlorophyll b,total chlorophyll and carotenoid,and the decrement increased with the increasing irradiation intensity. Under the enhanced UV-B radiation treatment,chloroplast structure was damaged,and thylakoid lamellae was disorde-red,swelling and even blurred. The effect of high intensity of radiation on chloroplast ultrastructure was greater than that of lower intensity of radiation.

关 键 词：芦苇 UV-B辐射 光合特性 光合色素 叶绿体超微结构 

分 类 号：Q945[生物学—植物学]