loading page

Photobleaching and recovery of Symbiodiniaceae Effrenium voratum SCS01 reveals life form transformation under thermal stress
  • +6
  • Sanqiang Gong,
  • Gang Li,
  • Xuejie Jin,
  • Dajun Qiu,
  • Jiayuan Liang,
  • Kefu Yu,
  • Yehui Tan,
  • Xiao Ma,
  • Xiaomin Xia
Sanqiang Gong
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Gang Li
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Xuejie Jin
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Dajun Qiu
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Jiayuan Liang
Guangxi University
Author Profile
Kefu Yu
Guangxi University
Author Profile
Yehui Tan
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Xiao Ma
South China Sea Institute of Oceanology Chinese Academy of Sciences
Author Profile
Xiaomin Xia
South China Sea Institute of Oceanology Chinese Academy of Sciences

Corresponding Author:[email protected]

Author Profile

Abstract

Symbiodiniaceae play important roles in the establishment of coral reef ecosystems in oligotrophic marine waters. Symbiodiniaceae Effrenium voratum is probably an exclusively free-living and heterotrophic species. How this species responds and acclimates to warming (a main environenmtal factor causes degradation of coral reef ecosystem) remain largerly unknow. In this study, we experimentally established the phenotypic landscapes related to the photobleaching and recovery processes of Effrenium voratum SCS01 following thermal stress. We found that thermal stress bleached the plastids of E. voratum SCS01 and caused the cells to become lighter in color; thereafter, the bleached cells recovered rapidly when they were returned to the optimal temperature. Accordingly, the dominant life form of E. voratum SCS01 shifted from mastigote cells to coccoid cells and then returned to mastigote cells. Transcriptome analysis revealed that the photobleaching of E. voratum SCS01 was due to increased degradation and decreased biosynthesis of photosynthetic pigments. Furthermore, the thermally induced life form changes were related to the downregulation of genes for cell motility. Our results revealed the mechanism of photobleaching in E. voratum SCS01 and indicated life form transformation as a newly identified survival strategy of Effrenium voratum SCS01 under thermal stress.