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General Marine Environmental Science
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Response of growth and photosynthesis of Gephyrocapsa oceanica to different nitrate availability under fluctuating natural solar light
P-GS-11-S
Xiaowen Jiang* , State Key laboratory of Marine Environmental Science, Xiamen University
Kunshan Gao, State Key laboratory of Marine Environmental Science, Xiamen University
Presenter Email: 118901353@qq.com |
| Gephyrocapsa oceanica is a widespread species of coccolithophore that has a significant impact on the global carbon cycle through photosynthesis and calcium carbonate precipitation. Here, an outdoor experiment was conducted for 12 days with the aim of investigating the effects of nitrate availability on its growth and physiological performance under fluctuating natural solar light. The specific growth rate of HN -cells was significant higher than LN-cells on sunny days with high solar radiation, and decreased when light intensity was low. But for LN-cells, the specific growth rate had no obvious difference between the period of overcast skies and sunshine. The cellular Chl a content for both treatment increased in cloudy days. Comparing with their short-term responses to high light, LN-cells were more sensitive to high light, our results indicated that though the light is the main factor limiting the growth of HN -cells, the nitrate seems to be more restrictive when it is insufficient. |
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