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Blue green algal growth and sporulation in response to simulated surface bloom conditions

Blue green algal growth and sporulation in response to simulated surface bloom conditions

British Phycological Journal 14(1): 59-68

DOI: 10.1080/00071617900650091

Physical and chemical factors were investigated for their effect on growth and differentiation of unialgal isolates and planktonic populations of blue-green algae from the Salopian meres under laboratory conditions. Most extensively investigated were 2 strains of Aphanizomenon flos-aquae (L.) Ralfs. Deficiencies of orthophosphate, nitrate and minor elements, reduced growth but did not stimulate sporualtion. N-glycyl-glycine inhibited heterocyst differentiation and sporulation and HEPES [N-2-hydroxyethylpiperazine-N'-2-ethanosulphonic acid] stimulated sporulation; extracellular compounds contained in filtrates from sporulating cultures had no effect on morphology. Exposures to extremes of light intensity and to UV light of 365 nm reduced and often stopped growth but did not induce akinete formation in either of the algal isolates or in any of the populations collected from the lakes.

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Accession: 004850896

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