Abstract
The developmental cycle of Nostoc and Anabaena species has been well elaborated (Rippka et al, 1979, Komarek & Anagnostidis, 1989, Gantar et al, 1991) but the appearance of anastomosing filaments and their role in the developmental cycle has been poorly described (Lazaroff and Vishniac, 1962). Cultivation of typical Nostoc in N2-free medium yields the abundance of hormogonia able to form anastomose. Ten soil isolates of N2-fixing Nostoc and Anabaena strains have been cultivated on BG-11 medium without or with different concentration of NaNO3.KeywordsColour CellSpore FormationDevelopmental CycleSoil IsolateShort FilamentThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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