단수수 品種의 特性 및 相關에 關한 硏究 = Studies on the characteristics and correlation among them in sweet sorghum varieties in Korea

다국어 초록 (Multilingual Abstract)

Eight sweet sorghum varieties, 6 from United States and 2 from Japan, were introduced to select a higher yielding variety with high sugar content, high Brix percentage and better stem yield. Cultivation of these varieties was done at the field of Crop Experiment Station, O. R. D. in Suwon. From the data obtained in this study the following summary can be drawn.
1. All the varieties were observed to be highly adapable to the natural condition of Korea. Considering the trend in Brix percentage, 4% of Brix was measured at the stage of 70 days after seeding and there was a constant accumulation of sugar in plant, hereafter. The highest sugar content was observed on 40 days after heading but soon the sugar content kept decreasing.
2. At the early stage of 70 days after seeding, lower nodes showed higher sugar content than upper nodes but conversely at the medium stage, lower nodes from 1st to 4th one showed lower sugar content. Among these lower nodes, 2nd 3rd node was relatively lower than 1st node, and from the 4th node, there was an increase in sugar content with highest percentage at 6th, 7th and 8th node. Upper part above the 8th node indicated a decrease in the sugar contnet.
3. Correlation between Brix percentage and main quantitative characters were computed as follow; between the length of upper node and Brix, r=-0.981^*, which is significant negative correlation, and regression equation was Y=95,000-1,000X. Heading date vs Brix percentage r=0.738^*, Y=0.937Y-56,600, fresh stem weight, vs Brix percentage, r=0.737^*, Y=1.340X-316.110, sucrose content in stem vs Brix percentage, r=0.745^*, Y=1.095X-6.400. Thus, it is concluded that to select the plant with high Brix percentage and sugar content the relatively late maturing individuals with short internode in upper part and heavy fresh stem should be chosen.
4. Among the eight varieties tested, HC6028II-4, Rex orange and Ames amber were high in Birx percentage, crystalizable sucrose and purity percentage, and above varieties are considered to be sugar type. In the other hand, Tracy, Rurier Var-1, Red amber, Early sumac and Chinese amber showed high stem yield and relatively high Brix percentage but they are inferior in sugar content and purity percentage, which makes these varieties syrup type.
Eight sweet sorghum varieties, 6 from United States and 2 from Japan, were introduced to select a higher yielding variety withhigh sugar content, high Brix percentage and better stem yield.
It was observed that all the varietiesare highly adaptable to the natural condition of Korea. Accumulation of sugar in plant was begining at the stage of after heading, and the highest sugar content was observed 40 days after heading. The nodes of 6th, 7th and 8th showed the highest sugar content percentage and upper part above the 8th node showed a decrease inithe sugar content.
Among eight varleties tested, the percentage of crystaizable sucrose in stem of HC6028II-4, Rex orange and Ames amber were 16. 84, 14. 14 and 11. 68, respectively and the percentage of the varieties was higher than those of other varieties.
Correlations between Brix percentage and main quantitative characters were as follows: heading datevs Brix, r=0.738^*, fresh stem weight vs Brix, r=0.737^*, between the length of upper node and Brix, r=-0.981^*, sucrose content vs Brix, r=0.745.^*

목차 (Table of Contents)

• Ⅰ. 緖 言
• Ⅱ. 硏究史
• Ⅲ. 材料 및 方法
• Ⅳ. 實驗結果
• 1. 形態學的 特性
• 2. 糖分含量分析
• 3. 各形質間에 存在하는 相關關係
• 4. 收量構成要素分析
• Ⅴ. 考 察
• Ⅵ. 摘 要