Inhibition of Calvin–Benson cycle suppresses the repair of photosystem II in Symbiodinium: implications for coral bleaching

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• 作者：Ranjeet Bhagooli (1)
  
• 关键词：Calvin–Benson cycle ; Coral bleaching ; Photoinhibition of PSII ; Symbiodinium
• 刊名：Hydrobiologia
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：714
• 期：1
• 页码：183-190
• 全文大小：235KB
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• 作者单位：Ranjeet Bhagooli (1)
  
  1. Department of Biosciences, Faculty of Science, University of Mauritius, Reduit, Mauritius
  
• ISSN：1573-5117

文摘

Inhibition of Calvin–Benson cycle (CBC) activity by thermal stress has been hypothesized to cause photoinhibition of photosystem II (PSII) in zooxanthellae of reef-building corals and consequently lead to bleaching. This study tests whether the interruption of CBC by glycolaldehyde (GA) leads to photoinhibition and subsequent coral bleaching in Stylophora pistillata. When S. pistillata was incubated with GA, the O2sub> evolution rate declined in a dose-dependent manner and the extent of photoinhibition, reflected by a decreased maximum quantum yield of PSII (F vsub>/F msub>), was enhanced. The effect of GA on photoinhibition was similar to that of chloramphenicol (CAP), an inhibitor of protein synthesis in chloroplasts. When S. pistillata was incubated in weak light following a high-light-induced photoinhibitory treatment, the recovery of PSII from photoinhibition was suppressed in a similar manner to both GA- and CAP-treated samples. After incubation in moderate light at 26°C, S. pistillata showed a bleaching response only in presence of GA. These results suggest that coral bleaching-like responses are caused by interruption of the CBC activity in S. pistillata and are associated with accelerated photoinhibition through suppression of the protein synthesis-dependent repair of PSII but not to an increase in photodamage to PSII.