Abstract
Gracilariopsis lemaneiformis was cultured at different temperatures (15, 23, and 31 °C) under CO2 levels of 390 and 800 μL L−1 for 2 weeks, to elucidate the physiological and biochemical responses to variable temperature at elevated CO2 in this marine-cultivated species in China. The relative growth rates (RGR) was highest at 23 °C among the three temperature levels. Photosynthetic pigments (Chl a, Car, PB) were CO2 independent, but the 15 °C-grown algae were always larger. In contrast, the Chl a/PB ratios increased with increasing growth temperature. The maximum relative electron transport rates (rETRm) presented a strong potential to acclimate lower growth temperature. Moreover, the photosynthetic acclimation was enhanced by elevated CO2. Adjustments of Chl a fluorescence and antioxidant enzymes were responsible for this photosynthetic acclimation strategy. A rise of Chl a fluorescence (α, E k, qP, and Y (II)) and superoxide dismutase (SOD) and peroxidase (POD) activities was observed when growth temperature decreased. These changes indicate a strong defense capability for reactive oxygen species (ROS) and a crucial role of elevated CO2 during long-term photosynthetic acclimation. Additionally, a decrease of the maximal quantum yield (Fv/Fm) was found when measured at 39 °C. Up-regulation of thermal dissipation was observed, as NPQ significantly increased at 31 °C at both CO2 levels.
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This study was supported by the National Natural Science Foundation of China (No. 41276148 and U1301235) and Science and Technology Planning Project of Guangdong (No. 2015 A020216004).
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Liu, C., Zou, D., Yang, Y. et al. Temperature responses of pigment contents, chlorophyll fluorescence characteristics, and antioxidant defenses in Gracilariopsis lemaneiformis (Gracilariales, Rhodophyta) under different CO2 levels. J Appl Phycol 29, 983–991 (2017). https://doi.org/10.1007/s10811-016-0971-8
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DOI: https://doi.org/10.1007/s10811-016-0971-8