NDLI: Effects of Ca and Mg on Growth and Calcification of the Coccolithophorid Pleurochrysis haptonemofera: Ca Requirement for Cell Division in Coccolith-Bearing Cells and for Normal Coccolith Formation with Acidic Polysaccharides

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Effects of Ca and Mg on Growth and Calcification of the Coccolithophorid Pleurochrysis haptonemofera: Ca Requirement for Cell Division in Coccolith-Bearing Cells and for Normal Coccolith Formation with Acidic Polysaccharides

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Effects of Ca and Mg on Growth and Calcification of the Coccolithophorid Pleurochrysis haptonemofera: Ca Requirement for Cell Division in Coccolith-Bearing Cells and for Normal Coccolith Formation with Acidic Polysaccharides

Content Provider	Springer Nature Link
Author	Katagiri, Fumio Takatsuka, Yukiko Fujiwara, Shoko Tsuzuki, Mikio
Copyright Year	2009
Abstract	The effects of Ca2+ and Mg2+ on cellular growth and calcification in Pleurochrysis haptonemofera were investigated. In the presence of a normal concentration of Mg2+, coccolith-bearing cells (C-cells) required more than 0.5 mM Ca2+ for growth, while naked cells could grow even with 0.5 mM Ca2+. The calcification rate of C-cells, which was determined using decalcified cells, was significantly repressed with less than or equal to 0.5 mM Ca2+. Although the calcification rate did not change so much with 5–30 mM Ca2+, it decreased with higher concentrations of Ca2+, as well as C-cell-specific growth repression. Under these conditions, Ca2+ affected the rate of coccolith formation, but neither the coccolith morphology nor total amounts and ratios of divalent cations and acidic polysaccharides (Ph-PS-1, -2, and -3) were included in coccoliths. These findings suggest that sufficient calcification is required for the division of C-cells. Under low Ca2+ and high Mg2+ conditions, coccoliths with an abnormal morphology, having immature shield elements, were synthesized. Composition analysis of the coccoliths revealed high Mg/Ca and low Ph-PS-2/(Ph-PS-1 and -3) ratios, as compared with those under low Ca2+ and normal Mg2+ conditions, suggesting that the abnormal morphology is due to a change in the crystal type and/or acidic polysaccharide composition.
Starting Page	42
Ending Page	51
Page Count	10
File Format	PDF
ISSN	14362228
Journal	Marine Biotechnology
Volume Number	12
Issue Number	1
e-ISSN	14362236
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-05-16
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coccolithophorid Pleurochrysis haptonemofera Calcium Magnesium Calcification Acidic polysaccharides Engineering Zoology Microbiology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Biotechnology

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Three Types of Acidic Polysaccharides Associated with Coccolith of Pleurochrysis haptonemofera: Comparison with Pleurochrysis carterae and Analysis Using Fluorescein-Isothiocyanate-Labeled Lectins

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Effects of Ca and Mg on Growth and Calcification of the Coccolithophorid Pleurochrysis haptonemofera: Ca Requirement for Cell Division in Coccolith-Bearing Cells and for Normal Coccolith Formation with Acidic Polysaccharides

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