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Updated: Aug 21, 2026

A Method for Adapting Euglena gracilis to Cassava-Based Substrates for Heterotrophic Cultivation
Published on: June 12, 2026
Light dependency of resistance to ionizing radiation in Euglena gracilis
Hirotaka Hayashi1, Issay Narumi, Seiichi Wada
1Research Institute for Advanced Science and Technology, Osaka Prefecture University, 1-1 Gakuencho, Sakai 599-8531, Japan.
Abstract:
The resistance of Euglena gracilis strains Z (wild type) and SM-ZK (chloroplast-deficient mutant) to ionizing radiation was investigated. The colony forming ability of E. gracilis strain Z was higher than that of strain SM-ZK after 60Cogamma-irradiation. For both strains, the resistance of light-grown cells was higher than that of dark-grown cells, suggesting that the light conditions during culture contribute to the radiation resistance of E. gracilis. The comet assay showed that the ability of rejoining DNA double-strand breaks (dsb) was much higher in the light-grown cells. These results suggest that E. gracilis possesses a light-induced repair system to cope with DNA dsb.
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