The inhibitory effect of light on growth of Prototheca zopfii Kruger

Bernard Epel, Robert W. Krauss

Research output: Contribution to journalArticlepeer-review


1. 1. White light from cool-white fluorescent lamps is inhibitory to the growth of Prototheca zopfi Kruger, an alga, Saccaromyces cerevisiae Hansen, a yeast, and Tetrahymena pyriformis Lwoff, a protozoan. The growth rate for Prototheca was found to drop linearly with increasing light intensity from 4.35 doublings per day to less than half a doubling per day at 1200 ft-candle. Incandescent light of equal intensity was less inhibitory, but radiation from "blacklight" fluorescent lamps was found to be much more inhibitory. The action spectrum for this inhibition of growth was found to be localized in the near-ultraviolet region of the spectrum as well as in the blue end of the visible spectrum with a major peak of 420 mμ. A small secondary peak is present between 500 and 600 mμ. The most likely receptor appears to be acytochrome. The inhibition of growth appears to be localized in the process of cell division. This inhibition may be a major factor in the phenomena of light-dark-induced synchrony in green algae.

Original languageEnglish
Pages (from-to)73-83
Number of pages11
JournalBBA - Biophysics Including Photosynthesis
Issue number1
StatePublished - 12 May 1966
Externally publishedYes


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