The Influence of Light, Oxygen and Temperature on the Herbicidal Properties of Paraquat

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Abstract
Light and O2 were essential for a rapid bleaching of the pigment system of broadleaf bean by paraquat (1, 1-dimethyl-4, 4-dipyridylium dichloride). This bleaching did not appear to be directly related to physiological activity but to the destruction of a protective system which normally prevents photooxidation. Light, but not O2, was also essential for the changes in membrane permeability brought about by paraquat in mesquite (Prosopis glandulosa), honeysuckle (Lonicera saponica), and broadleaf bean (Phaseolus vulgaris). Changes in permeability were also temperature dependent. Light was not essential for paraquat''s effect on root elongation in mesquite.

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