On the duration of fertilizing ability of wheat pistil and the vitability of the seed produced in this case.

[摘要] 1. Castration of many ears of wheat var. Saitama No. 27 apparently in a stage of several days before flowering was carried out simultaneously by the clip method in the field, and then mature pollen of wheat var. Norin No. 26 was pollinated daily. 2. During eleven days ranging from the time a few days before flowering to the time six or seven days after flowering, fertilizing ability of the pistil was highly retained. Seeds of high vitality were produced by the daily pollination during these eleven days. 3. It was observed that fertilizing ability of the pistil decreased sharply after the twelfth day from castration and then almost disappeared on the fourteenth day from castration. 4. Immediately atter castration and on the following day the receptivity of the pistil was comparatively low while germination energy of the seed was high, but sinee the second day from castration, the receptivity of the pistil and germination energy of the seed showed the sarne tendency. 5. It is favourable in crossing operation that pollination is possible to be carried out safely at any time during these comparatively long period.

[学科分类] 农业科学（综合）