Abstract
JENSEN et al. have proposed that the biosynthesis of carotenoid pigments in the photosynthetic bacterium Rhodopseudomonas spheroides proceeds by the following sequence of reactions1,2: Mutant strains have been known for several years which do not form spheroidene or spheroidenone but accumulate precursors in the biosynthetic pathway. One of these mutants, strain Ga, accumulates neurosporene and chloroxanthin (hydroxyneurosporene)3; a second, strain uv-33, accumulates phytoene4.
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