Summary: The major pigments induced by parahydroxymercuribenzoate and parachloromercuribenzoate (both SH group inhibitors) in the fungus have been characterized as carotenoids. Those present in both chemically-induced and light-induced cells include phytoene, β-carotene, γ-carotene, lycopene, torulene and neurosporaxanthin. Two other organomercurial compounds, phenyl mercuric acetate and phenyl mercuric chloride, were also found to induce pigment formation. These pigments have the absorption properties of carotenoids, but have not been fully characterized. A range of other SH group inhibitors tested failed to induce any pigment formation.


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