含水量を異にするインゲンマメの種子の浸水における温度の影響

抄録

To study the influence of temperature on the soaking of seeds, the writer used the kidney bean(Phaseolus vulgaris L.). The seeds which absorbed various amounts of moisture by placing in desiccators or moist chambers at room temperature were soaked in tap water filtrated through the ion exchange resin and kept at temperatures of 0°, 10°, 20°, 30° and 40℃. for periods varying from 2 to 48 hours. At the termination of the soaking period, the water was drained off and the seeds were placed for germination tests on moist filter papers in cabinets held alternately at 20℃. for 16 hours and 30℃. 8 hours. As a result of soaking in water for 2 hours, the seeds which contained more than 5.7 per cent of moisture before soaking in water showed a decrease in germinative capacity at low temperature and normal germination at high temperature. On the other hand, the germination of dry seeds was perfectly inhibited at high temperature but increased at low temperature. This increase of germination occurs as a result of the slight absorption of water during the soaking at a low temperature for 2 hours. Dry seeds soaked at 0℃. for 8 hours were perfectly deprived of their germinative capacity. In the next experiment, the seeds with large moisture contents were soaked in water for 24 or 48 hours. Seeds soaked in water at temperatures lower and higher than 20° and 30℃ for 24 hours showed a pronounced decrease in germination, but those soaked in water at 20℃ and 30℃ for 24 and 48 hours still had their germinative capacity. The soaking temperature and the moisture contents of the seeds are the important factors in soaking injury.