산성토양의 한계지역은 인도네시아에 많이 분포해 있다. 하지만, 산성토양과 관련된 낮은 pH와 영양소는 콩 생산성의 제한요인이 된다. 따라서 콩의 식품 활용성을 위해 양분소와 생리활성성분에 대한 정보가 산성토양에 내성인 콩 품종과 함께 필요하다. 본 연구는 산성토양 내성 콩 유망계통 20개의 단백질, 지방, 지방산, 이소플라본 함량을 구명하기 위해 수행하였다. 그 결과, Tgm/Anj-888, Tgm/Anj-862 및 Tgm/Anj-858 등 3개의 계통에서 단백질함량이 높은 것으로 나타났다(≥45% dry weight=dw). 지방함량은 16.85~21.20% dw의 범위를 보였으며, 단백질함량과는 부의 상관관계를 보였다(r=- 0.64). 콩 지방은 평균적으로 팔미트산 9.42%(C16:0), 스테아릭산 2.77%(C18:0), 올레산 43.93%(C18:1), 리놀레산 38.53% (C18:2) 및 리놀렌산 5.35%(C18:3)으로 구성되었다. 총 10종류의 이소플라본이 분류되었으며, 주요성분은 말로닐-제니스틴 (29.49%)으로 그 뒤를 이어 말로닐-다이드진(19.04%), 글리시틴(16.70%)으로 밝혀졌다. 이소플라본 함량은 Tgm/Anj-995계통(2,130.2μg/g dw)에서 가장 높았으며, 그 뒤를 이어 Tgm/ Anj-784계통과 Tgm/Anj-832계통(각각 1,719.9 μg과 1,710.0 μg/g dw)인 것으로 나타났다. 본 영양소 정보는 육종가들이 산성토양에 내성인 새로운 콩 품종을 보급하는데 있어 작물 특성의 보완적인 자료로서 유용할 것이다.

Doenjang is one of the most favorite traditional food which was produced by the fermentation process of soybean with various microbes such as Aspergillus oryzae, Bacillus subtilis and so on. The aim of this research is to analyse the antioxidant and anti-α-glucosidase inhibitory activities of doenjang made by 9 different cultivar (Daewonkong, Taekwangkong, Daepungkong, Hwangkeumkong, Saedanbaek, Hanolkong, Pungsannamulkong, Cheongja-3 and Cheongdu-1). Doenjang samples were made by traditional manner using rice straw. Each samples were extracted with 40% methanol and extract were used Among them, cheongja-3‘s doenjang showed a significant highest antioxidant and anti-α-glucosidase inhibitory activities because of its anthocyanin. Except for cheongja-3's Doenjang, antioxidant activity had positive correlation with isoflavone content. But no relationship observed between isoflavone content and anti-α-glucosidase activity. The highest anti-α-glucosidase activity was observed in Saedanbaek's Doenjang with highest protein content.

In southern region of Korea, double cropping system including soybean as a second crop is widely adopted because prolonged high temperature in October enables soybean maturation even in late autumn. Global warming during decades derives transition of soybean planting dates as late as late-July. Delayed planting beyond the critical time moves reproductive stage to less favorable weather conditions like low temperature and short photoperiod, which can affect soybean yield and seed composition. Therefore selection of appropriate cultivar for changed climate and cultural practice is required. Effects of different eco-type and planting date on soybean yield was investigated for three sowing dates of 20 June, 5 July and 20 July with ten cultivars. Strong interaction between cultivar and sowing date was detected in number of branch, node and pod. No significant interaction was observed in 100-grain weight and yield, and this might be resulted from similar yield reduction pattern. Daepung, Taekwang and Uram recorded the highest yield when planted late, proving that these three cultivars are the most adaptable to delayed planting. Delayed planting results in higher sugar content, especially stachyose and raffinose which have detrimental effect on human health by causing flatulence and diarrhea. Protein content was decreased and oil content was increased in July 20 planting. Decrease in protein content was the largest in Hwangeumol and maintained high in Saedanbaek. This information will provide a guideline when select appropriate soybean cultivar in delayed planting to maintain yield and seed quality.

Soybean isoflavones include daidzein, genistein and glycitein with their glycosides, and their malonated derivatives are the main polyphenolic compounds that are helpful for human health. Our research objective was to investigate the differentitation of soybean isoflavones contents of breeding populations between yellow and black soybean. Isoflavones contents in soybean are a wide range from 500 to 7000 ㎍/g. In this study, we used Ilmi (Isoflavones content, 3.612 ㎍/g) as male parent and 04GAYT-4 (Isoflavones content, 1,648 ㎍/g) as female parent. From these varieties, we obtained 94 breeding lines (yellow, 48 lines; black, 25 lines; brown, 21 lines) which have isoflavones content range from 1000 to 6000 ㎍/g. Highest isflavone contents of three different breeding lines was yellow seed coated lines (average isoflavone content, yellow 3,046 ㎍/g, brown 2,935 ㎍/g, black 2,813 ㎍/g).

Soybean self-sufficiency in Korea was 22.5% in year 2011, and as free trade agreement between Korea and US comes into effect, the amount of soybean importation increases. In 2012, paddy field soybean cultivation was over 0.1 million ha and it is expected to increase continuously due to rise in market price of soybean. Moreover, double cropping system including paddy field soybean is widely adopted nationwide, but studies on appropriate cultivar for this environment are insufficient. In this research, the effect of planting date and different cultivars on soybean growth and yield was investigated for three planting dates (June 20, July 5, and July 20) with 15 cultivars. According to ANOVA test, soybean yield was significantly different depending on sowing date and cultivars and interaction between sowing date and cultivars was also detected, meaning each of cultivars resulted different yield depending on sowing date. When planted on July 20, stem length, nod number, branch number and grain weight was decreased because of short growing period, resulting in yield decrease. Percentage of yield obtained from July 20 in contrast to that of June 20 showed that Pungwon, Nampung and Daepung recorded the least yield decrease and the highest yield when planted late. Evaluation of late-sowing-adaptable soybean cultivar in paddy field is now being carried on following last year.

Soybean isoflavones include daidzein, genistein and glycitein with their glycosides, and their malonated derivatives are the main polyphenolic compounds that are helpful for human health. Our research objective was to investigate the differentitation of soybean isoflavones contents of breeding populations between high and low isoflavones contained soybean. Isoflavones contents in soybean are a wide range from 500 to 7000 ㎍/g. In this study, we used Ilmi (Isoflavones content, 3.108 ㎍/g) as male parent and Dajin (Isoflavones content, 578 ㎍/g) as female parent. From these varieties, we got 165 breeding lines which have isoflavones content range from 472 to 2973 ㎍/g. Isflavone contents in breeding lines showed normal distribution.