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KMID : 0545120000100030381
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Journal of Microbiology and Biotechnology
2000 Volume.10 No. 3 p.381 ~ p.385
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Calcium-Boron Interaction in Exopolysaccharide Production by the Cyanobacterium, Nostoc spongiae forme
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SINGH, NEETU
Asthana, R.K./Singh, S.P.
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Abstract
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The effect and interaction of Ca and B on exopolysaccharide (EPS) synthesis in the diazotrophically growing cyanobacterium, Nostoc spongiaeforme, was investigated. The absence of B inhibited EPS synthesis 1.56-fold (16㎍ glucose equivalent/㎎ dry weight, 16d) over the control cells (25㎍ glucose equivalent) grown in medium containing 0.5mM Ca and 8μM B. When B concentration was raised to 40μM, EPS production was stimulated 1.8-fold. Reduction of Ca concentration to one-half (0.25 mM) resulted in increased B demand (16μM) by the cells for EPS production at par with the normal sets. However, without Ca, EPS production also increased as B increased. Addition of B to a Ca-free medium stimulated cyanobacterial diazotrophic growth as well as synthesis of Chl a and phycocyanin (0-8d). The data suggest B-dependent diazotrophic growth during Ca-deficiency and point to an important interactive role of Ca and B in regulation of cyanobacterial EPS synthesis.
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