Contribution of lowered unsaturation levels of chloroplast lipids to high temperature tolerance of photosynthesis in Chlamydomonas reinhardtii

Norihiro Sato, Kintake Sonoike, Akihiko Kawaguchi, Mikio Tsuzuki

研究成果: Article査読

29 被引用数 (Scopus)

抄録

A mutant of Chlamydomonas reinhardtii designated as hf-9 is impaired in fatty acid desaturation of chloroplasts, and showed lowered unsaturation levels of chloroplast lipids, as compared with the parent. The effects of temperature on photosynthesis were compared between hf-9 and the parent for investigation whether or not unsaturation levels of chloroplast lipids are correlated with the thermal properties of photosynthesis. Growth rates determined by turbidity were higher in the parent than in hf-9 at both 10 and 24°C, while similar for the parent and hf-9 at 39°C. The cells grown at 24°C revealed that both activities of CO2-dependent oxygen evolution acid photosystem II were higher in the parent than in hf-9 in the range between 7 and 40°C. In contrast, hf-9 surpassed the parent in both activities at 45°C. Optimal temperatures for both activities were at around 35°C and 40°C in the parent and hf-9, respectively. Incubation of the cells at 41 and 45°C demonstrated that the activity of photosystem II in hf-9 was more tolerant to the high temperatures than that in the parent. These results suggest that lowered unsaturation levels of chloroplast lipids contributed to high temperature tolerance of photosystem II, and eventually to that of photosynthesis.

本文言語English
ページ(範囲)333-337
ページ数5
ジャーナルJournal of Photochemistry and Photobiology B: Biology
36
3
DOI
出版ステータスPublished - 1996 12
外部発表はい

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Biophysics
  • Radiology Nuclear Medicine and imaging

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