期刊
MARINE ENVIRONMENTAL RESEARCH
卷 154, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2019.104871
关键词
Ocean warming; Diatoms; Carbonic anhydrase; Rubisco; Global change; Enzymes; Phaeodactylum tricornutum; Thalassiosira weissflogii
资金
- National Natural Science Foundation of China [41376156, 41806141]
- Innovation Program of Guangdong Province [2018KTSCX173]
In this study, we examined the effects of increased temperature (15, 20 and 25 degrees C) and different light levels (50, 200 mu mol photons m(-2) s(-1)) on two widely distributed diatoms, namely Phaeodactylum tricornutum and Thalassiosira weissflogii. Results showed that increasing light level counteracted the negative effects of high temperature on photosynthesis in both species, suggesting an antagonistic interaction between light and temperature. Contrary to the above results, light limitation diminished the temperature-sensitivity of carbonic anhydrase activity in two diatoms. We also observed species-specific responses of biomass, where increased temperature significantly decreased the biomass of P. tricornutum at both low and high light levels but showed no effects on T. weissflogii. Our study demonstrated that light can alter the physiological responses of diatoms to temperature but also revealed interspecific variations. We predict that in the future ocean with shallower upper mixed layer, T. weissflogii may be more competitive than P. tricomutum.
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