J Integr Plant Biol. ›› 1977, Vol. 19 ›› Issue (4): -.

• Research Articles •    

Effects of Co60 Irradiation on the Growth of Unicellular Green Alga Scenedesmus obliquus (Turp.) Kuetzing and Protective Action of L-cysteine

Tseng Chao-tsi and Ma Chia-hai   

Abstract: We irradiated the medium containing unicellular green alga (Scenedesmus obliquus) with different dosages of Co60 radiation: 8000 r, 12000 r, 24000 r, 32000 r. We added L-cysteine to the algal suspension treated with 16000 r and 32000 r. After treatment, we observed their growth conditions. Observations were made on cell division, cell size, morphological variation and biomass. The results were obtained as follows: 1. Biological effect of the irradiation becomes apparent above 8000 r. 2. The living cells survive only 40% after 4 weeks, therefore LD50 of this alga is about 8000 r to 30 days. 3. In comparison with the higher plants, the effect of Co60 irradiation on the algal cells becomes more apparent in the progeny than in the parent cells. 4. L-cysteine at the concentration of 0.041 mg/ml exerts a marked protective action in reducing the damage due to Co60 irradiation.

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