- 作者： 湯文通
- 作者服務機構： 國立臺灣大學
- 中文摘要： Although soybean in Taiwan is grown three croppings in a year (spring, summerand fall), the breeder can not proceed the hybridized progenies of soybean severalgenerations per year, because environmental conditions of these different growingseasons are extremely deviated from one another. However, if the gene frequencycan be controlled unchanged in the early generation after hybridization, we maydevelop some methods to complete 5-6 early generations within two or three years,and then begin the selection work. Thus the total breeding period can be shortened. This study was conducted by the regulation of light during various developmentalstages of soybean and the treatment of low temperature to soybean seed beforegermination in order to promote the flowering stage. Immature seeds were harvestedto test their germination ability at different stages and also to find out whether theymight be grown as normal plants or not. The results of this preliminary study aresummarized as follows. 1. Low temperature treatments (0°C, 10°C, 15°C) had no effect on promoting theflowering stage, and even decreased the germination rate of soybean seed. 2. As the studied variety (Palmetto) to be considered the low temperaturetreatment combined with short day treatment might accelerate flowering about 4.5days earlier than check. 3. By short day treatment, only a little effect on plant height, seed yield andweight per hundred seeds was found, but a large effect was shown on the numberof seed per ten plants. 4. The suitable stage for short day treatment is immediately after the develop-ment of first trifoliate which may promote flowering of soybean 20 days earlierthan check. 5. The immature seed harvested 30 days after flowering was found to have ashigh germination rate as usual. This study is to be continued.
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