Journal of Tropical Oceanography >
Effects of warming on the metabolism and photosynthetic physiology of the symbiotic algae of two morphological types of Galaxea fascicularis
Copy editor: YIN Bo
Received date: 2021-06-22
Revised date: 2021-08-26
Online published: 2021-08-27
Supported by
National Natural Science Foundation of China(41976120)
Key Research and Development Project of Hainan Province, China(ZDYF2020200)
Research Project of Sanya Yazhou-Bay SCI-TECH City Administration(SKJC-2020-01-010)
Science and Technology Planning Project of Guangdong Province, China(2020B1212060058)
The effects of warming on the metabolism and photosynthetic physiology of symibiodiniaceae of two morphological types (H and S) of a reef-building coral, Galaxea fascicularis, were studied. The results showed that the physiological responses of H-type and S-type to warming were clearly different. At the symibiodiniaceae level, H-type lost a large number of symibiodiniaceae, and reduced the burden of respiratory metabolism of symbionts. In S-type, the number of zooxanthellae could still maintain the needs of symbionts for respiratory metabolism, while increasing the content of chlorophyll b to enhance light absorption. At the host level, the H-type made full use of nutrients delivered by zooxanthellae and compensated for energy consumption through heterotrophic feeding. The nutrients stored by the S-type host could assist the symbionts to adapt to the thermal environment. Galaxea fascicularis adapted itself to environmental changes through different energy utilization modes, i.e., H-type tended to maintain the metabolic balance of the symbiont, while S-type intended to improve the energy distribution of symbiotic algae.
HE Qian , YU Xiaolei , LIANG Yuxian , ZHANG Zhe , HUANG Hui , ZHOU Weihua , YUAN Xiangcheng . Effects of warming on the metabolism and photosynthetic physiology of the symbiotic algae of two morphological types of Galaxea fascicularis[J]. Journal of Tropical Oceanography, 2022 , 41(5) : 133 -140 . DOI: 10.11978/2021078
图1 升温对丛生盔形珊瑚H型和S型净光合呼吸速率(a)、光增强呼吸速率(b)、暗呼吸速率(c)和总光合速率(d)的影响*表示差异显著(p<0.05) Fig. 1 The effect of warming on photosynthesis and respiration metabolism of coral. (a) net photosynthetic rate (Pn); (b) light-enhanced respiration rate (RL); (c) dark respiration rate (RD); (d) total photosynthetic rate (Pg). * indicates significant difference (p < 0.05) |
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