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

Abstract

Abstract: In this paper, the effects of UV-B radiation on the physiological and biochemical processes of [WTBX]Nostoc[WTBZ] 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 [WTBX](Fv/Fm)[WTBZ] 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.

Key words: UV-B radiation, desert, biological crusts, cyanobacterium, photosynthesis efficiency, reactive oxygen species (ROS)

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]., 2012, 29(5): 816-819.

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Response of Nostoc sp. to UV-B Radiation and the Protective Effect of Exogenous Antioxidants to Nostoc sp.

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