초록
<P><B>Abstract</B></P> <P>In the present study, light illumination was found to be efficient in elevating the total fatty acid content in a newly isolated heterotrophic microalga, <I>Crypthecodinium</I> sp. SUN. Under light illumination, the highest total fatty acid and DHA contents were achieved at 96h as 24.9% of dry weight and 82.8mgg<SUP>−1</SUP> dry weight, respectively, which were equivalent to 1.46-fold and 1.68-fold of those under the dark conditions. The elevation of total fatty acid content was mainly contributed by an increase of neutral lipids at the expense of starches. Moreover, light was found to alter the cell metabolism and led to a higher specific growth rate, higher glucose consumption rate and lower non-motile cell percentage. This is the first report that light can promote the total fatty acids accumulation in <I>Crypthecodinium</I> without growth inhibition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A <I>Crypthecodinium</I> strain was isolated and named as <I>Crypthecodinium</I> sp. SUN. </LI> <LI> Light was firstly employed on <I>Crypthecodinium</I> and increased its TFA and DHA contents. </LI> <LI> The increase of TFA content was contributed by the decrease of starch. </LI> <LI> Light increased the specific growth rate of <I>Crypthecodinium</I> sp. SUN. </LI> </UL> </P>