This study explores strategies to expand Korea's top 10 seafood export in the oversea market, with a specific focus on the impact of export concentration. For certain seafood items such as laver, crab, and mackerel, characterized by low export concentration, adopting a focused export expansion strategy is more effective. Conversely, highly concentrated seafood items such as toothfish, cod, pollack, and abalone face high risks in export performance due to their heavy reliance on a small number of key export countries. To ensure export stability, it is advisable to implement a diversified export expansion strategy for these highly concentrated seafood items. In the case of medium-concentration seafood items like tuna, oyster, and flounder, the decision between a concentrated or diversified strategy should be based on their specific export situations. Tailoring strategies to the distinctive market characteristics of each seafood item enables exporters to effectively increase oversea market share, promoting stability and sustained growth in export performance.

본 연구는 감마선 조사 및 배양방법을 이용하여 유 용한 변이체를 선발하고, 그 특성을 관찰하기 위해 수 행되었다. 기내 신초수의 증식은 MS 배지 내에 NAA 0.2mg·L-1에 BA의 농도가 1.0mg·L-1로 증가할수록 양호한 반면 신초의 길이와 뿌리형성율은 감소되었다. 계대배양을 3회 수행한 후 온실에서 순화 및 삽목하였다. 감마선으로 조사된 총 370 개체들은 감마선의 조 사선량에 관계없이 토양이식 후 생존율이 97% 이상이 었다. 조사된 개체들 중 변이의 빈도는 감마선의 선량 이 증가할수록 높아졌다. 50Gy 조사구에서는 화색과 화형의 변이가 각각 28.2와 15.4%로 확인되었다. 화 색과 화형은 다양한 변화를 나타냈으며 줄기색 또한 변화되었다. 예를 들면 흰색에 옅은 자주색의 관상화는 흰색, 적자색, 노랑색 또는 연분홍색 등으로, 흰색이었 던 설상화는 연한 자주색이나 적자색으로 바뀌었다. 설 상화의 길이와 폭 및 화경의 크기가 달라진 개체 및 줄기에서 안토시아닌 색소가 제거된 개체도 관찰되었 다. 본 연구결과 국화 ‘Argus’에서 기내 배양체에 30- 50Gy의 감마선 조사에 의해 화색, 화형 및 줄기색의 다양한 돌연변이체를 선발할 수 있었다.

Hexaploid wheat (Triticum aestivum L.) exceeds about 30% of the world’s cereal production and cultivated over 220 million ha worldwide. Heat stress during the grain filling period gives detrimental effect on crop yields and has emerged as a serious problem throughout the world. Korean wheat cultivars that were released since 1960s were developed for various aims such as winter hardness, earliness, and pest resistance, etc. However, heat stress resistance is an emerging target for wheat breeding nowadays. Selected 11 Korean wheat cultivars (“Baegjoong”, “Dajung”, “Goso”, “Hanbaek”, “Jokyung”, “Joeun”, “Jopum”, “Keumgang”, “Olgeuru”, “Sinmichal”, “Uri”) were exposed to high temperature from DAF (days after flowering) 9~13. In this study, plant responses to heat stress as measured by reduction ratios of total chlorophyll contents, 100 seed weight, shoot dry weight can be translated into degree of tolerance. Therefore, these parameters can be used in wheat breeding for heat tolerance during grain filling period. The obtained results allow us to classify cultivars for heat stress tolerance. Pedigree information of Korean cultivars was shown that wheat line of either tolerant, moderate tolerant, or susceptible trait is succeeded to their descendent, which enable breeders to develop heat stress tolerant wheat by appropriate parental choice.

The protein in soybean seeds accounts for approximately 40% of the dry seed weight. Two major storage proteins, 7S and 11S, constitute 70-80% of the total storage proteins in the seeds. In this study, the variation of total soluble protein extracts from 1152 soybean landraces that have been collected from South Korea were studied using high-throughput screening method with HT Protein Express Labchip (Caliper Life Sciences, Inc.). Seven distinct protein band patterns - four protein sub-units of 11S and three sub-units of 7S, were taken into account and their presence or absence were analyzed. Among the 1152 landraces, 525 genotypes were identified as lacking lipoxygenase, 255 lacking α1 subunit, 680 lacking α subunit, 169 lacking β subunit, 140 lacking acidic, 114 lacking Kunitz Trypsin Inhibitor (KTi) and 199 lacking basic protein patterns. The high-throughput protein analysis is helpful in screening a large number of populations with less time and minimum labor. The selected genotypes with low amounts or lacking of anti-nutritional factors such as trypsin inhibitor, lipoxygenase and α subunit would be used for future breeding purpose of quality improvement in soybean protein.