Singlet oxygen production in herbicide-treated photosystem II
Singlet oxygen production in herbicide-treated photosystem II
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DOI：
10.1016/s0014-5793(02)03724-9
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发表时间：
2002-12-18
期刊：
影响因子：
3.5
通讯作者：
Krieger-Liszkay, A
中科院分区：
文献类型：
--
作者：
Fufezan, C;Rutherford, AW;Krieger-Liszkay, A
利用自旋捕获技术研究了除草剂处理的光系统II中光生活性氧的变化。而（OH）-O-.和O-2（-.）O-1（2）与酚类除草剂的作用是与尿素除草剂作用的2倍。这与报道的这些除草剂对半醌Q（A）（-.）并且符合O-1（2）是通过电荷重组反应产生的假设，所述电荷重组反应由除草剂结合刺激并由除草剂的性质调节。当酚类除草剂被结合时，在P（+.）Pheo（-）在化学上有利于形成叶绿素三联体，因此形成O-1（2）。对于尿素除草剂，该途径不太有利。(C)2002年欧洲生物化学学会联合会。由Elsevier Science B. V.出版，版权所有。
Photo-generated reactive oxygen species in herbicide-treated photosystem II were investigated by spin-trapping. While the production of (OH)-O-. and O-2(-.) was herbicide-independent, O-1(2) with a phenolic was twice that with a urea herbicide. This correlates with the reported influence of these herbicides on the redox properties of the semiquinone Q(A)(-.) and fits with the hypothesis that O-1(2) is produced by charge recombination reactions that are stimulated by herbicide binding and modulated by the nature of the herbicide. When phenolic herbicides are bound, charge recombination at the level of P(+.)Pheo(-.) is thermodynamically favoured forming a chlorophyll triplet and hence O-1(2). With urea herbicides this pathway is less favourable. (C) 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.