Accumulation of Trehalose as a Compatible Solute under Osmotic Stress in Euglena gracilis Z |
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| Authors: | SHIGEO TAKENAKA TOMOHIRO KONDO SONBOL NAZERI YOSHIYUKI TAMURA MASAO TOKUNAGA SHINGO TSUYAMA KAZUTAKA MIYATAKE YOHSIHISA NAKANO |
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| Institution: | Laboratory of Nutrition and Food Science, Hagoromo-gakuen College, Sakai, Osaka 592, Japan;Department of Applied Biological Chemistry, Osaka Prefecture University, Sakai, Osaka 593, Japan;Department of Chemistry of Bioresources. Kagoshima University, Kagoshima 890, Japan;Department of Veterinary Science, Osaka Prefecture Universig, Sakai, Osaka 593, Japan |
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| Abstract: | ABSTRACT. The photosynthetic protozoon Euglena gracilis, accumulated a large amount of trehalose in the cells under salt or osmotic stresses. Radioactivity of 14C] paramylon, a β-1,3-polyglucan which was stored in the cells of E. gracilis. was degraded rapidly and this radioactivity was almost stoichiometrically incorporated into trehalose. The interconversion of trehalose from paramylon by salt or osmotic stresses was dependent on the concentrations or osmotic pressures, suggesting that E. gracilis accumulate trehalose as an osmoprotectant. After the removal of salt or osmotic stresses, trehalose was gradually degraded, however, it was not converted into paramylon. |
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| Keywords: | Paramylon salt stress |
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