The effects of the different temperatures on the amylase activity and growth rate of the rye seed1ings grown in the solutions containing radioactive sulfur- 35 were studied.
The amylase activity of the coleoptiles obtained from the seedlings grown in the solutions of S-35. at 14℃, appeared to be strongly stimulated in comparison to the control, but the culture temperatures of 22℃ and 30℃ showed the decrease in the amylase activity. The amylase activity of the grains treated with the low intensity of the ratioactive material didn´t show clear changes, at any culture temperatures, but the amylase activity of the grains treated with the high intensity of S-35, 50 μc, showed definite decline at the elevated culture temperature, 30℃. Similiar effects were also found in the growth of the seedlings.
However, we would consider the effects of the radioactive materials on the acticity of the amylase and the growth of the seedlings are resulted from the accumulation of the much amount of the radioactive materials, and this accumulation rate depends upon actually the elevation of the culture temperature.
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