UV-B辐射增强对芦苇生长及生理特性的影响

在UV-B辐射增强条件下,以芦苇为材料,研究了不同辐射梯度对芦苇生长及生理特性的影响.结果表明:与自然光照相比,UV-B辐射增强可显著降低芦苇植株高度、比叶面积、生物量,且高强度辐射处理的影响大于低强度辐射,随辐射时间延长,生物量分配有向地下部分转移的趋势;与自然光照相比,UV-B辐射增强可显著增加芦苇叶片丙二醛(MDA)含量、抗氧化酶活性(SOD、CAT、GR、APX)、抗氧化物质含量(GSH、As A),且随辐射强度增大,MDA含量、酶活性、抗氧化物质含量增强程度加剧,但随辐射时间延长,高辐射处理下,GR酶活显著低于对照,GSH也表现出相应的趋势;UV-B辐射增强条件下,类胡萝卜素含量显著降低,而类黄酮含量较对照组却显著升高,且高强度辐射处理对芦苇叶片紫外吸收物质的影响大于低强度辐射.

Effects of enhanced UV-B radiation on growth and physiological characteristics of Phragmites australis

The effects of UV-B radiation intensities on growth and physiological characteristics of Phragmites australis had been studied.The results showed that the enhanced UV-B radiation significantly reduced the plant height, specific leaf area and biomass, the effects of high intensity of UV-B radiation was greater than that of lower''s, and thebiomass allocation tended to shift to the underground with the lengthening of radiation time. The MDA content, antioxidant enzyme activities (SOD, CAT, GR, APX) and antioxidants (GSH, AsA) increased significantly compared with the control, and the degree of intensification increased while increasing radiation intensity. However, when prolonging the radiation time, the GR activity was significantly lower under high irradiation than that under the control, and GSH showed a corresponding trend. The carotenoid content decreased and flavonoid increased significantly compared with those of the control. The effects of high intensity of radiation on UV absorbing material was greater than that of lower intensity of radiation.