Bigelow Lab for Ocean Sciences;
ME 04575;
U.S.Ahe effects of light on the fluorescence characteristics and biochemical composition of a marine diatom Tha-lassiosira pseudonana in light and dark cycles were investigated with semi-continuous culture. The results indicate that;
with the increase of growing light intensity;
DCMU enhanced fluorescence yield (Fd/Chl);
enhanced fluorescence ratio (Fd/F);
cellular carbohydrate content. carbohydrate/chlorophyll a and carbohydrate/protein ratio increased;
but the fluorescence yield and cellular chlorophyll a content decreased;
The protein content declined with the increase of light intensity in the range of 10- 100 μmol/ (m2.s) and increased at higher than 100 μmol/ (m2.s). Sampling time during the day had great effect on the relationships between growing light intensity and cellular chlorophyll a;
carbohydrate content;
carbohydrate/chlorophyll a and carbohydrate/protein ratio.;
chlorophyll; carbohydrate; biochemical; declined; Sampling; photosynthetic; morning; phytoplankton; evening; negligible;