Studies in carotenogenesis. 28. The effect of illumination on carotenoid synthesis in french-bean (Phaseolus vulgaris) seedlings

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Abstract
The main carotenoid pigments in the cotyledons of etiolated French bean (Phaseolus vulgaris) are [beta]-carotene, lutein, chrysanthemaxanthin and auroxanthin. The carotenoids in the etiolated leaves of the same plant are [beta]-carotene, lutein and neoxanthin. Illumination of etiolated bean seedlings results in the synthesis in both the cotyledons and the true leaves of the carotenoids associated with chloroplasts; this is a consequence of the formation of functional chloroplasts.