Abstract
The fertilizations of cv Palkweng, Noupoung, and TN 1 which were crossed artificially at 2$0^{\circ}C$ and 3$0^{\circ}C$ were examined. The meiosis and the rate of maturity of the above 3 cultivars, Iri #326, Milyang #29, Suwon #264, and 3 others which were transplated at different times in paddy field were examined, and the results of which were as follows. 1. Palkweng at 3$0^{\circ}C$ was fertilized within 1.5~4.0 hours ,after pollination and at 20\circ C was done within 2.8~4.5 hours after pollination. 2. Noupoung and TNI at 3$0^{\circ}C$ were fertilized within 2.0~5.5 hours after pollination and at 2$0^{\circ}C$ were done within 3.0~6.0 hours after pollination. 3. The rates of fertilization of the cultivated rice plants at 2$0^{\circ}C$ were dropped in general. TN 1 at 2$0^{\circ}C$ was often fertilized abnormally. 4. In the development of embryo, Palkweng was the earliest at 3$0^{\circ}C$ and TN 1 was the earliest at 2$0^{\circ}C$. 5. Although the time of transplant was late, the pollens of Palkweng was normal because the meiosis of that was normal. but the pollens of TNI was sterile in general because of the abnormal meiosis.
팔굉, 노풍, TN1 3품종을 공시하여 2$0^{\circ}C$하에서 인공수분하여 수정과정을 조사하고, 상기 3품종외 이외326, 밀양29, 수원264등 9개품종을 일반포장에서 이앙기를 달리하여 감戮수분열과 등숙비율을 조사한 결과는 단음과 같다. 1 팔굉은 3$0^{\circ}C$하에서는 수분후 1시간30분에서 4시간후에, 2$0^{\circ}C$하에서는 2시간30분에서 4시간30분후에 수정이 된다. 2. 노풍과 TN1은 3$0^{\circ}C$하에서는 2시간에서 5시간30분후에, 2$0^{\circ}C$하에서는 수분후 3시간에서 6시간후에 수정이 된바. 3. 저온인 2$0^{\circ}C$하에서는 수정률이 저하하고, 특히 TN1에서는 극핵과 정핵 또는 난세포와 청핵의 수정이 거의 동시에 되는 것과 어느 한편만 수정이 되는 때도 있다. 4. 조발육에 있어서는 2$0^{\circ}C$하에서는 팔굉이 빠른 것 같고, 3$0^{\circ}C$하에서는TN1이 빠른 것 같다. 5. 팔굉은 이앙기가 늦어도 감수분열에 이상이 없이 정상화분립을 형성하나, TN1은 감수분열에 이상이 있어 불념화분립수가 많아진다.