抄録
It is already shown that the supply of sugar is necessary to induce the vernalization effects. :Herewith, the authors have carried out an expe riment to know the critical duration of supply wheats by using a winter variety "YOKOZAWA"under the concentratibns of 1% and 3% glucose, respectively. Consequently, it was found that the inducing of vernalizationeffects required more than 6 days m the 1%, 4 days m the 3% respectrvely and if the treatment was less than 2 days, there appeared not sign of vernalization effects. But the evidence did not exist enough to show that the vernalization effects were incereased by elongating the duration of sugar supply. The seeds treated with cold temperature during various lengths of period were kept sudcesively in the same condition without air and the infiuence of absence of oxygen upon the induction of vernalization eifects were examined. In this case there was no sign of vernalization effects as shown already by some workers. But as the seeds subjected to the cold treatment of the critical number of days enough to induce vernalization effects stand in the very unstable condition, and yet, this condition tends to be stabilized easily by elongating the duration of cold treatment, it seems to be necessary to, research'the physiological nature of vernalization in consideration of these points.
