Effects of ultraviolet-C irradiation on membrane lipid peroxidation and activity of PSⅡ electron transport in chloroplasts of Taxus cuspidata needles

Abstract

Abstract: The isolated chloroplasts of Taxus cuspidata needles treated with 12 W·m^-2 of ultraviolet C (UV-C, 254 nm) irradiation were studied under laboratory conditions. The results showed that with the increase of UV-C irradiation, the carotenoids (Car) and glutathione (GSH) contents and superoxide dismutase (SOD) activity were decreased, while the malondialdehyde content (MDA) and the relative permeability of chloroplasts membrane were increased to various extents. The PSⅡ electron transport activity was conspicuous decreased, which had a significant inverse ratio with photosynthetically active radiation(PAR). UV-C irradiation was insensitive on chlorophyll. The results indicated that membrane lipid peroxidation of chloroplasts caused by UV-C radiation was the reason of the decrease of PSⅡelectron transport activity.

Key words: Taxus cuspidata, Chloroplasts, UV-C radiation, Membrane lipid peroxidation, PSⅡelectron transport activity

CLC Number:

S718.51

DU Yingjun, JIANG Ping, WANG Bing, SHI Yi. Effects of ultraviolet-C irradiation on membrane lipid peroxidation and activity of PSⅡ electron transport in chloroplasts of Taxus cuspidata needles[J]. Chinese Journal of Applied Ecology, 2003, (8): 1218-1222.

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