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RE: phototoxicity of malachite green - ?effect on plants

On Tuesday, September 30, in APD #985, Beverly Erlebacher wrote:

> Old stuff, new uses - Malachite green is one of the dyes used in
> photodynamic therapy, a relatively new cancer treatment.  These
> dyes have the property of forming highly active (toxic) derivatives
> when exposed to light.
> [....]
> I've wondered whether it works by the same mechanism in the aquarium,
> and whether the fish scales are protective from light, [....]

Interesting thought. But what about the plants?  One wonders whether
the concurrent photosynthesis makes them more vulnerable or less
vulnerable to the phototoxic effects of the dye. Do you have any info
on the site of action of the activated products, at cellular level?

Ross Drewe