Improved use of organic phosphate by Skeletonema costatum through regulation of Zn2 + concentrations |
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Authors: | Yanjun Shi Hanhua Hu Runyu Ma Wei Cong Zhaoling Cai |
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Institution: | School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China. |
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Abstract: | The maximum growth rate (1.4-2 x 10(5) cells ml(-1) d(-1)), cell final yields (2.6-5.2 x 10(5) cells ml(-1)) and extracellular alkaline phosphatase activity (2.4-10.6 microg phosphate released ml(-1) h(-1)) of the red tide alga, Skeletonema costatum, increased when Zn2+ was increased from 0 to 24 pM, but decreased with 66 pM Zn2+ in growth medium with glycerophosphate as the sole phosphorus source. Extracellular carbonic anhydrase activity and the affinity for HCO3- and CO2 uptake increased when Zn2+ was increased from 0 to 12 pM, but then decreased at higher concentrations. The results suggested that utilization of organic phosphate required more Zn2+ than the uptake of inorganic carbon did, while utilization of dissolved inorganic carbon by Skeletonema costatum was very sensitive to Zn2+ concentration variations. |
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Keywords: | growth organic phosphate red tide Skeletonema costatum Zn2+ |
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