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MA Dongdong, LI Yongfu, FU Haifang. Effect of high temperature on the balance between photosynthetic light absorption and energy utilization in Chlorella pyrenoidosa (Chlorophyceae)[J]. Journal of Oceanology and Limnology, 2020, 38(1): 186-194

Effect of high temperature on the balance between photosynthetic light absorption and energy utilization in Chlorella pyrenoidosa (Chlorophyceae)

MA Dongdong1, LI Yongfu2,3, FU Haifang4
1 Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2 Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
3 Nantong Research and Development Center of Marine Science and Technology, Institute of Oceanology, Chinese Academy of Sciences, Nantong 226019, China;
4 Zhonglu Environmental and Engineering Assessment Center of Shandong Province, Jinan 250013, China
Chlorella pyrenoidosa (Chlorophyceae) is widely cultured for production of health food and animal feed. In outdoors, mass cultivation of C. pyrenoidosa often suffers from high temperature. A better understanding of the effects of high temperature on photosynthesis and photoprotection can help optimize the productivity of C. pyrenoidosa cultures. In this study, we investigated effect of high temperature (35, 38, or 41℃) on the balance between photosynthetic light absorption and energy utilization of C. pyrenoidosa. In contrast to 30℃, higher temperature of 35 or 38℃ did not inhibit the growth of C. pyrenoidosa. Treatment in 35℃ maintained the balance. Moreover, the PSI acceptor side in 38℃ was over-reduced and PSII reaction centers were over-excited under strong light, which destroyed the balance and generated active oxygen species (AOS). However, the activated antioxidant enzymes might remove completely the over-production of AOS, thereby protect C. pyrenoidosa cells from photodamage. It shows that this C. pyrenoidosa strain could tolerate as high as 38℃. Furthermore, treatment in 41℃ resulted in more lack of the balance than that in 38℃. However, the activities of antioxidant enzymes stopped increasing in 41℃, and were not strong enough to remove the excess AOS. Therefore, treatment in 41℃ could decrease the growth of C. pyrenoidosa. In addition, strong and longtime light exposure would cause serious photodamage to C. pyrenoidosa cells.
Key words:    antioxidant enzyme|Calvin cycle|high temperature tolerance|photoprotection|photosynthesis|Chlorella pyrenoidosa   
Received: 2018-12-25   Revised:
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