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SILICATE DEFICIENCY AND LIPID SYNTHESIS OF MARINE DIATOMS 1,2
Author(s) -
Taguchi Satoru,
Hirata Janice A.,
Laws Edward A.
Publication year - 1987
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1987.tb04133.x
Subject(s) - silicate , biology , stationary phase , exponential growth , biomass (ecology) , growth rate , botany , phase (matter) , carbon fibers , chromatography , ecology , chemistry , materials science , organic chemistry , composite number , composite material , mathematical analysis , geometry , mathematics
Lipid synthesis of three marine diatoms was studied with a 14 CO 2 incorporation technique in silicate limited batch cultures. Growth rates were independent of the silicate concentration but the cellular yields were proportional to the initial amount of silicate. At the beginning of the stationary growth phase, lipid synthesis rates per unit culture volume increased by 1.7 times for Chaetoceros gracilis, 3.1 times for Hantzschia sp., and 2.8 times for Cyclotella sp., respectively compared to those during the exponential growth phase. Lipid carbon accounted for as much as 57% of the carbon in C. gracilis, 71% in Hantzschia sp., and 65% in Cyclotella sp., respectively. Additional enrichment with silicate during stationary growth phase allowed the cultures to grow further. Lipid synthesis rates were reduced during the subsequent growth phase, and the growth rates themselves were dependent on the level of biomass achieved during the previous stationary phase. However, the cellular yields were similar and probably controlled by light.