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以中国腾格里荒漠地区广泛存在的生物土壤结皮——真藓为研究对象,在室内条件下研究了不同UV-B辐射强度对真藓光合作用、细胞膜完整性、可溶性蛋白、抗氧化酶等方面的影响。结果表明:经UV-B辐射处理的真藓叶绿素含量、叶绿素荧光参数、可溶性蛋白质含量及其抗氧化酶活性明显降低,且与辐射强度成正比,而丙二醛和类胡萝卜素含量随着辐射强度增加而增大。研究表明,UV-B辐射强度升高降低了真藓的光合速率,并造成了细胞膜的损伤,导致抗氧化酶系统的紊乱,而类胡萝卜素含量的升高,可能是其抵御UV-B胁迫的自我保护机制之一。
In this study, the biological soil crusts (Trichoderma spp.), Which exist widely in the desert area of Tengger, China, were studied under different indoor conditions to study the photosynthesis, membrane integrity, soluble protein, And other aspects of the impact. The results showed that chlorophyll content, chlorophyll fluorescence parameters, soluble protein content and antioxidant enzyme activities of true moss treated with UV-B radiation decreased significantly and were proportional to the intensity of radiation, while the content of malondialdehyde and carotenoid increased with radiation Strength increases and increases. The results showed that the increase of UV-B radiation intensity reduced the photosynthetic rate of true moss and caused the damage of cell membrane, leading to the disorder of antioxidant enzyme system. The increase of carotenoid content may be due to its resistance to UV-B stress One of the self-protection mechanisms.