Abstract
Colony differentiation in Microdochium bolleyi, i.e. the transformation of hyaline cells into melanin-pigmented chlamydospores, was found to be markedly affected by medium composition and light, potato dextrose agar producing the most intense pigmentation of the media tested. Spectra of alkaline extracts of M. bolleyi melanin absorbed in the ultraviolet region; logarithmic plots of such spectra between 380 and 540 nm gave a series of straight lines. Under alternating light/dark regimes, zones of dark pigmentation were produced that coincided with the light phases. This rhythm was found to be exogenous in nature and ceased when uniform external conditions were re-established. The implications of these findings are discussed.
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