Pigment biosynthesis and herbicide interaction
1993
Boeger, P. | Sandmann, G. (Konstanz Univ. (Germany). Lehrstuhl fuer Physiologie und Biochemie der Pflanzen)
This paper reports on the mode of action of so-called bleaching compounds which affect the biosynthesis of carotenoids and chlorophylls, respectively, causing interrupted build-up or degradation of the photosynthetic apparatus. In the first case such inhibitors lead to accumulation of precursors of beta-carotene and xanthophylls, which cannot protect chlorophyll (Chl) against the photooxidation. Herbicidal inhibitors of Chl biosynthesis result in accumulation of protoporphyrin IX which is sensitised by light thereby inducing radical peroxidative reactions. The peroxidative stress can - under certain circumstances - be counteracted by the antioxidative system of the plant cell.
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