Abstract
Growth and photosynthesis of cultivated seaweeds usually suffer carbon limitation during cultivation in the field. Pyropia haitanensis and Gracilaria lemaneiformis, collected from Nan’ao Island, Shantou, China, were cultured under ambient carbon and decreased carbon supply, with ambient sunlight and decreased sunlight conditions, aiming to investigate how the decreased carbon supply and sunlight conditions affect growth and photosynthesis in these two maricultured seaweed species. Decreased carbon supply significantly lowered the relative growth rate (RGR), quantum efficiency of open PS II (F v′/F m′), maximum photosynthetic electron transport rate (rETRm), and NO3 − uptake rate in both of the two seaweeds. Under ambient sunlight condition, the RGR of the P. haitanensis and G. lemaneiformis grown at decreased carbon supply was reduced about 83 and 95 %, respectively, compared with the algae grown at ambient carbon condition. The RGR, F v′/F m′, and NO3 − uptake rate were higher in P. haitanensis but were lower in G. lemaneiformis, with under decreased sunlight compared to ambient sunlight. The results indicated that decreased carbon supply reduced growth and PS II activity in both of the seaweeds, with the reduction being greater in G. lemaneiformis than in P. haitanensis. Additionally, G. lemaneiformis was adapted to grow at relative higher light conditions than P. haitanensis.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. U1301235 and No. 41276148) and Guangdong Science and Technology Bureau (2015A020216004). The authors would like to thank Yayun Deng and Jiejun Zhang for assistance with the experiments.
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Jiang, H., Zou, D. & Chen, B. Effects of lowered carbon supplies on two farmed red seaweeds, Pyropia haitanensis (Bangiales) and Gracilaria lemaneiformis (Gracilariales), grown under different sunlight conditions. J Appl Phycol 28, 3469–3477 (2016). https://doi.org/10.1007/s10811-016-0882-8
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DOI: https://doi.org/10.1007/s10811-016-0882-8