Abstract
In recent years much has been studied about the effects of various heteroauxin treatment on the germination of seeds, but the effects under various temperature are not studied so much.
Therefore, the author studied the influence of the heteroauxin treatment on the germination of aquatic rice seeds of three varieties, Senichi, Sinriki and Rikuu No.132, at various condition of alternating temperature by the following method:-
Aquatic rice seeds of the three varieties are soaked in 5×10-4%, 25×10-4%, 75×10-4%, 375×10-4%, 1875×10-4% heteroauxin solution, for each 2, 4, 6, 8, 10, 24, 48, 72 hours respectively, while as check lot they are soaked also in plain water. All of the lots is divided into two series. Namely, one of the series is set in room temperature (Fig. 1) and the other in a thermostat, in which the range of temperature is larger than that in room temperature, for above mentioned each treating hours. (Fig. 2.) In this way, we obtain 267 lots in all.
After the fourth days from the beginning of the treatment, we count the number of germinated seeds and the percentage of germination for each lot, for each day, was computed as shown table 1.
In the results of this experiment we see clearly that the heteroauxin treatment accelerates the germination energy, but no significant differences of the germination capacity by the heteroauxin treatments or those under the different temperatures were established in this germinationtests.
