Variations in SGAT enzyme activity of Chiamydomonas reinhardtii L. cells under different cultural conditions

Hong Tao Li, Ke Zhu, Qing Dai Liu, Zhao Jiang Zuo, Ye Rong Zhu, Yan Ling Bai, Yong Wang

Research output: Contribution to journalArticlepeer-review


In this study, the model single cell plant Chlamydomonas reinhardtii was used to investigate variations in serine: glyoxylate aminotransferase activity in cells under different cultural conditions. The results showed the optimum pH of SGAT was in the range of 5-7, and SGAT decreased gradually when the pH was higher than 7. SGAT activity in the cell also declined with the increase of cell density. SGAT activity was influenced significantly by the light intensity, and the effect strengthened with the increase of light intensity. Moreover, acetate, which was the sole carbon source of C. reinhardtii in heterotrophic growth, also affected the SGAT activity. In addition, SGAT activity in the cell increased remarkably when the oxygen concentration was higher than that in the normal air, and the increased carbon dioxide concentration treatment also led to an increase. The SGAT activity both reduced under 40 or 15 °C. Furthermore, the content of Gly was increased and the content of Ser was decreased when the oxygen pressure increased in the air, resulting in a raise in Gly/Ser ratio from 0.79 to 1.49.

Original languageEnglish (US)
Pages (from-to)359-364
Number of pages6
JournalPlant Physiology Communications
Issue number4
StatePublished - Apr 2010
Externally publishedYes


  • Acetate
  • Cell density
  • Chlamydomonas reinhardtii
  • Light intensity
  • Oxygen pressure
  • Photorespiration
  • SGAT

ASJC Scopus subject areas

  • Forestry
  • Ecology
  • Molecular Biology
  • Genetics
  • Agronomy and Crop Science
  • Plant Science


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