[Effects of ultraviolet-C irradiation on membrane lipid peroxidation and activity of PS II electron transport in chloroplasts of Taxus cuspidata needles].
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 PS II 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 PS II electron transport activity.
Du
Yingjun
Y
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang University of Technology, Shenyang, China. duyi2000@yahoo.com.cn
Jiang
Ping
P
Wang
Bing
B
Shi
Yi
Y
D002736:Chloroplasts / Q000378:metabolism / Q000528:radiation effects*; D004579:Electron Transport / Q000528:radiation effects*; D015227:Lipid Peroxidation / Q000528:radiation effects*; D008563:Membrane Lipids / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000378:metabolism / Q000528:radiation effects*; D020946:Taxus / Q000378:metabolism / Q000528:radiation effects*; D014466:Ultraviolet Rays
D008563:Membrane Lipids; D045332:Photosystem II Protein Complex