Three species of algae, Anabaena flos-aquae, Nostoc commune and Scenedesmus acuminatus were selected for their sensitivity to juglone and studied for the effects of juglone concentrations of 10, 1, 0.5, 0.1 and 0.01 μg/ml upon their growth. A. flos-aquae was most sensitive, with significant inhibition by the 0.5 μg/ml concentration. N. commune was inhibited least, with significant inhibition only in the 10 μg/ml concentration. S. acuminatus was found to be moderately inhibited at the 0.5 μg/ml concentration. All species were found to be non-viable after 14 days exposure to 10 μg/ml juglone. Tests with 7 and 14 day old cells of S. acuminatus showed significant differences in growth. Seven day old cells used as inoculum were inhibited by all concentrations while 14 day old cells showed growth in excess of controls in three concentrations (0.5, 0.1 and 0.01 μg/ml). All studies with 14 day old cells showed slight, but not significant, increases in growth in the 0.01 μg/ml concentration. These results suggest that juglone may enhance growth of some soil micro-organisms.
Randall, V. Diane and Bragg, Jimmy D.
"Effects of Juglone (5'-Hydroxy-1, 4-Naphthoquinone) on the Algae Anabaena flos-aquae, Nostoc commune, and Scenedesmus acuminatus,"
Journal of the Arkansas Academy of Science: Vol. 40
, Article 18.
Available at: http://scholarworks.uark.edu/jaas/vol40/iss1/18