Antibiotic activity of new cyanobacterial isolates from Australia and Asia against green algae and cyanobacteria |
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Authors: | Ines Schlegel Nga Thanh Doan Nola de Chazal Geoffrey D Smith |
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Institution: | (1) Department of Limnology of Stratified Lakes, Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, D-16775 Neuglobsow, Germany;(2) Division of Biochemistry and Molecular Biology, School of Life Sciences, Faculty of Science, The Australian National University, ACT, 0200, Australia |
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Abstract: | One hundred and ninety-eight cyanobacterial strains, newly isolated mainly from samples collected from diverse habitats in
Australia, Indonesia, Nepal, Thailand and Vietnam, were screened from their antibiotic activity against green algal species
of the genera Coelastrum, Scenedesmus and Monoraphidium. We report the discovery of ten strains of Fischerella, seven of Nostoc
and three of Calothrix that produce antialgal compounds with a broad activity spectrum. Some of these bioactive cyanobacteria
inhibited all three algae, whereas others inhibited only two, and some only one. In addition, the 20 active strains were tested
against other selected cyanobacteria, including Anabaena doliolum which grows well both photoautotrophically in light and
heterotrophically in darkness, and three toxic species, Microcytis aeruginosa, Anabaena circinalis and Nodularia spumigena,
which are problems in Australia and other parts of the world. At least one Fischerella strain had bioactivity directed against
photosynthetic electron transport of algal chloroplasts, whereas others had no effect on photosynthesis. In most cases the
growth inhibitory effects were also tested in the presence of a proteinase. The results are discussed in the light of the
possible nature of the chemical inhibition and also in relationship to competition and allelopathy in algal populations.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | screening cyanobacteria green algae antibiotics bioactive compounds antibiosis allelopathy |
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