INTERACTIONS BETWEEN BACTERIA-FREE ANABAENA-MACROSPORA CLONE AND BACTERIA ISOLATED FROM UNIALGAL CULTURE

Cyanobacteria are accompanied by many bacteria in the mucus zone of th e vegetative cell. A strain of Anabaena macrospora (A. macrospora) pro ducing an earthy-musty odor was isolated from Lake Biwa together with 28 isolates of bacteria. Based on preliminary test results, 18 isolate s were selected for incubation in a one-tenth Tripto-soy broth solutio n, and their genera and species were identified. Four isolates belonge d to Alcaligenes, nine to Pseudomonas, four to Moraxella and one was n ot identified, Four isolates, Alcaligenes sp., Alcaligenes eutrophus, Moraxella sp. and Alcaligenes faecalis (A. faeculis) had a direct infl uence on me growth of A, macrospora and geosmin production. As the mul tiplication of bacteria was faster than A. macrospora, the consistenci es of the bacteria cells and the period of bacteria addition had no in fluence on the final growth of A. macrospora and geosmin production.