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- Title
Growth Inhibiting Substances Formed by Algae.
- Authors
Jørgensen, Erik G.
- Abstract
Experiments were carried out with algae in mixed cultures (two species cultures) or with algae cultured in filtrates from cultures of other algae or the same species. In experiments with Asterionella formosa and Nitzschia palea it was shown that both species formed substances which inhibited the growth of the other species and that the rate of inhibition was very dependant on the experimental circumstances. It was shown further that Nitzschia formed autotoxic substances and it was suggested that Asterionella formed substances which accelerated the growth of other Asterionella cells and of Nitzschia in some cases. In experiments where Nitzschia was cultured in filtrates from Scenedesmus quadricauda and Chlorella pyrenoidosa cultures, it was shown that Scenedesmus formed substances which considerably inhibited the growth of Nitzschia. The growth of Nitzschia was not inhibited in filtrates from a 4-8 days old Chlorella culture but was distinctly so in filtrates from a 13-17 days old Chlorella culture. When Chlorella was cultured for 3 days in filtrates from a 21 days old Scenedesmus culture a marked inhibition of the growth was found. During 3 days of culturing of Chlorella in filtrate from a 21 days old Nitzschia culture an acceleration of the growth of Chlorella took place. Similarly an inhibition of the growth was found when Scenedesmus was cultured for 3 days in filtrates from a 21 days old Scenedesmus culture. On the other band, an acceleration of the growth of Scenedesmus took place when it was cultured in filtrates from a 21 days old Chlorella and a 21 days old Nitzschia culture, respectively.
- Subjects
ALGAE; NITZSCHIA palea; CHLORELLA; SCENEDESMUS; SPECIES; PHYTOPLANKTON
- Publication
Physiologia Plantarum, 1956, Vol 9, Issue 4, p712
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1956.tb07833.x