抄録
In this report, the active duration of phosphorylase within the ripening kernel was examined, when rice plants were placed under the cool temperature. Upon experiments, two glass rooms, the cool glass room at 17°C constant for the treatment and the glass room without air-conditioning for the control, were used. Rice plants, variety Norin No. 29, were previously cultured in pots in the field. Flowers which bloomed on the 7th of September (1956) were labelled. After three days, rice plants were placed in two glass rooms separately. Enzyme preparations were made from time to time from the kernel at the various stages of ripening, which had been developed from only the labelled flowers. The method for the measurement of phosphorylase activity was the same as the case of the previous work. As shown in Fig. 1, it was found that the active duration of the starch phosphorylase of rice plants which were placed in the cool glass room was considerably prolonged further than the control, without any lowering in enzyme activity of the corresponding age of kernel.
