Effect of variation of day-length, day and night-temperatures, and intensity of daylight upon the growth of chlorella

Abstract

When Chlorella is grown outdoors without artificial regulation of environmental conditions, there occur not only diurnally intermittent variation of light intensity, but also variations of day- and night-lengths accompanied by diurnal changes of temperature. It is now a commonplace that the variations of day- and night-lengths and day- and night-temperatures have manifold effects on the development of higher plants. The study to be reported here was carried out with a view to investigating whether and in what manner such diurnal variations of environmental conditions affect the growth of Chlorella. © 1955, Applied Microbiology, Molecular and Cellular Biosciences Research Foundation. All rights reserved.