Varietal differences in amylase activities in germinating seeds and seedlings of some crops-wheat, barley, naked barley, oat, upland rice, paddy rice and rape were studied and were obtained the results as follows : (1) Significantly varietal variations in amylase activity were not recognized - in germinating seeds in the six crops with one exception of wheat , and amylase activity per unit fresh weight of germinating seeds of these crops was, in the order of descending activity, wheat, barley, oat, upland rice and paddy rice, and amylase activities of upland and paddy rice were markedly low, and that in rape was not recognized in this experiment. (2) Amylase activity in the seedlings of each varieties of above seven crops was closely related to the cold resistance, amylase activity of cold-hardy variety was stronger than that of non hardy variety. (3) It was found in wheat and upland rice that the concentration of reducing sugar in the varieties of stronger amylase activity was higher than that in weaker varieties. From the above-mentioned results, the measurement of amylase activity in seedling under the some condition may be useful for determination of cold resistance in the crops.
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