
TY  - JOUR
A1  - Chen, Xiongwen 
A1  - Gao, Kunshan 
T1  - Characterization of diurnal photosynthetic rhythms in the marine diatom <emph type="2">Skeletonema costatum</emph> grown in synchronous culture under ambient and elevated CO<emph type="8">2</emph>
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2004
VL  - 31
IS  - 4
SP  - 399
EP  - 404
KW  - apparent carboxylating efficiency, efficiency of the light reaction, photochemical efficiency of PSII, photosynthetic capacity, photosynthetic CO2 affinity.
UR  - https://doi.org/10.1071/FP03240 
N2  - Photosynthetic performance was examined in Skeletonema costatum (Greville) Cleve. under 12 : 12-h light : dark (LD) cycle at ambient CO2 (350 &#956;L L&#8211;1) and elevated CO2 (1000 &#956;L L&#8211;1). At ambient CO2, the cellular chlorophyll a content, the light-saturated photosynthetic rate (Pm), the initial slope of the light saturation curves (&#945;), the photochemical efficiency of PSII (Fv / Fm), the apparent carboxylating efficiency (ACE) and the photosynthetic affinity for CO2 [1 / Km(CO2)] all showed rhythmical changes with different amplitudes during the light period. The Pm had similar changing pattern in the light period with the ACE and 1 / Km(CO2) rather than with the &#945; and Fv / Fm, indicating that rhythmical changes of photosynthetic capacity may be mainly controlled by the activity of C-reduction associated with CO2 uptake during the light period. The CO2 enrichment reduced the ACE and the affinity to CO2, and increased the &#945;, cellular chlorophyll a content and Pm based on cell number. By contrast, the changing patterns of all photosynthetic parameters examined here during the light period had almost the same for cells grown at ambient CO2 and elevated CO2, suggesting that the photosynthetic rhythms of S. costatum are not affected by CO2 enrichment. 
ER  -

