抄録
The author investigated the interaction effect of temperature and humidity on trends of germination power of cucumber pollen after dehiscence. Pollen vitality decreases with increasing temperature in these experiments. Low humidity hastens the rapidity of losing germination power in all temperatures used. The harmful effect of saturated humidity on pollen vitality is greater at high temperature than at low temperature. The favorable humidity for longevity is 80% which is usual during summer in Sapporo. Rate of pollen germination in male flowers at 10°C. and 80% humidity was maintained high (over 50%) for a considerably long period (till 8 p. m. of the fourth day after flowering). Pollen vitality was increased by alternation from low to high humidity, while it was decreased by the reverse alternation from high to low humidity. A parallel relation was ascertained between results of pollination and germination tests on artificial media. Trends of germination power varied according to the starting time of treatment to low temperature.
