抄録
Many reports have been published concerning the germination tests of pollen in many crops, but there on some factors affecting the germination of pea pollen. Four varieties were sown five times in the spring and one variety was sown four times in the autumn. The results obtained were as follows:
1. The germination percentage of pea pollen considerablly increased as the time during which pollen was placed on the artificial germinating medium grew longer from one hour to about 6 hours, but only slightly increased when the time grew longer than 8 hours. The elongation of pollen tubes showed similar results.
2. The artificial medium containing 1% agar and 20% sucrose is most suitable for the pollen germination.
3. There were no significant differences in germination percentage and development of pollen-tubes in the temperature range from 10°C to 30°C. 0°C and 40°C were very injurious to the pollen germiare only few reports in leguminous vegetables, es-pecially in peas. Then the studies were carried out nation.
4. The percentage of germination and the amount of growth of pollen was better in the dark than in the light.
5. The pollen gathered between 8a.m. and 5p.m. showed almost no differences in the germination percentage and elongation of pollen-tubes.
6. The germinability of pollen showed considerable differences according to the stages of bud deve-lopment. The fertility of pollen gathered from the buds of the day before anthesis, i. e. the day of the dehiscence of anthers, was the highest, and the pollen grains of the flowering day were rather poorer germinators. The pollen from the buds of the 4 days before anthesis did not germinate at all. Germinating ability was already recognized at the bud stage of 3 days before anthesis.
