Fig. 2. Light stimulated growths of the glacial Flavobacterium strains.

Strains were statically cultured in 5 ml of peptone-yeast extract-glucose broth within test tubes at 14 °C in an incubator installed with a color 865 LUMILUX light that generates cold white light, with overrepresentation of 520–620 nm wavelengths. Triplicate cultures of each strain were illuminated and cultured in dark wrapped by aluminum foil, respectively. OD values at 600 nm were measured in 2-day intervals, and growth curves of representative 10 strains are shown by the empty and solid symbols showing growth under light and dark conditions, respectively. Growth rates and final cell mass of all the strains are shown in Supplementary Table 3. The averages of three replicates and standard deviations are shown.