Effect of the Herbicide San 6706 on Biosynthesis of Photosynthetic Pigments and Prenylquinones in Raphanus and in Hordeum Seedlings
Open Access
- 1 April 1977
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung C
- Vol. 32 (3-4) , 236-240
- https://doi.org/10.1515/znc-1977-3-414
Abstract
The pyridazinone herbicide San 6706 blocks chlorophyll and carotenoid formation simultaneously in a correlated way in both Raphanus and Hordeum seedlings. With decreasing carotenoid content the carotenoid precursor phytoene appears in San 6706-treated plants. The accumulation of the chloroplast prenylquinones (plastoquinone-9, α-tocopherol, α-tocoquinone and vitamin K1) is much less affected. This indicates that the biosynthesis of C20- and C45-prenyl chains (geranyl-geraniol, phytol and solanesol) which are incorporated in prenylquinones is not blocked by San 6706. It is assumed that the block of chlorophyll and carotenoid formation is due to one basic inhibition mechanism. The possibility that San 6706 may interfere with chloroplast ribosome formation, is discussed.Keywords
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