망개떡의 주원료인 청미래덩굴 잎은 소금물에 저장한 후, 이용 시 세척하여 사용한다. 이에 염장 시 저장 과정에서의 잎의 특성변화를 확인하였다. 천일염과 정제염으로 염장 후 저장한 잎의 수분함량 변화 에서는 차이를 보이지 않았으며, 소금의 농도가 높을수록 수분함량은 크게 감소하였다. 실온에서는 정제염에 저장한 잎의 전단력이 높았으나, 저온(4℃)에서는 천일염에서 저장한 잎의 전단력이 높았고, 소금의 농도는 높을수록 저장기간은 짧을수록 전단력이 높아지는 경향을 보였다. 실온보다 저온에서 저장과 소금의 농도가 10% 이하에서 저장한 잎의 색도 변화가 적은 것으로 나타났다.

Tea plants growing under natural condition meet various stresses. The tea plants often subjected to adverse condition like low temperature and high light intensity during overwintering. Because tea plant is adapted well to low light intensity, higher light intensity might induce negative effects on tea growth at open field (exposed habitat). We investigated tea plant planted with the seeds of wild tea trees growing at Unsu-ri, Hwagaemyun, Hadong-gun on Nov. in 2008. The experimental field for juvenile tea plants was located in the hill neighboring GSNU at Jinju, Korea. We divided the field into open, semi-shaded, and shaded condition. Light intensity (PAR) at open condition was two times and twenty times higher than at semi-shaded and shaded condition, respectively. Growth of tea plants was highly dependent on light condition, the plants at open field was extremely poor as compared to plants grown at shaded field. Height of plants at open, semi-shaded, and shaded field were 14, 17.3, and 17.8 cm, respectively. Leaf size was also greater in plants grown at shaded field. Photosynthesis-related chlorophyll fluorescence (quantum yield) was also higher in shaded plants. Fv/Fm value of plants grown at open fields was lower by 50% as compared to that of the plants grown at shaded field. Chlorophyll content measured by SPAD meter also indicated higher value in open field plant than shaded plants. Our results suggested the photoinhibition during overwintering period strongly affects the growth juvenile tea plants because there was no significant difference in soil moisture content between open and shaded condition.

Soybean sprouts produced at physiological optimal temperature around 20℃ are placed or displayed for several days in market shelf of relatively cool temperature (ca. 13℃). During this period a number of changes occur including changes in color, smell, taste, nutritional quality, and etc. In order to know the changes, soybean sprouts packed in plastic film bag were stored at different temperature of 3℃and 13℃. Morphological characters, physicochemical changes and enzymes activity related to soybean quality (color) were examined. Although the number of fine roots and hypocotyl length were greater in sybean sprouts stored at 13℃, there was no significant difference in diameter, fresh weight and dry weight of hypocotyl between storage temperatures. Browning of hypocotyl known as typical deterioration in sprout quality was highly dependent on the activity of polyphenol oxidase (PPO) in hypocotyl. Considering the low level of soluble protein in hypocotyl, the relatively higher activity of PPO suggested a critical role of PPO in stored soybean sprout. PPO activity of sprouts stored at 13℃ was 2 times higher than that of sprouts stored at 3℃ after 4 days. The PPO activity was observed no longer than 6 day in sprouts stored at 13℃. Crude protein content was increased to 30.9～35.4% on a dry weight basis as storage period was extended. The changes in crude protein was more higher in sprouts stored at higher temperature (13℃). Total free amino acid content was increased in both temperatures. However, the changing rate was greater in sprouts stored at 13℃.

Seashore Paspalum (Paspalum vaginatum Swartz) is a warm season grass and indigenous to tropical and subtropical regions of coastal areas worldwide. The species is used as feed for cattle and horses and has been very successful for golf courses worldwide. One of the most outstanding characteristics of seashore paspalum is its tolerance to saline soils compared to other warm season turfgrasses. The development of new seashore paspalum cultivars with improved traits could be facilitated through the application of biotechnological strategies. The purpose of this study was to product for herbicide resistant seashore paspalum using Arobacterium-mediated transformation and this study is the first report on transformation and herbicideresistant transgenic plants in seashore paspalum. Embryogenic calli were induced from the seeded variety of pseashore paspalum. Embryogenic calli were transformed with Agrobacterium tumefaciens strain EHA105 carrying the binary vector pCAMBIA3301 with two genes encoding gusA and bar. Transformed calli and plants were selected on medium containing 3 mg/l PPT. PCR detected the presence of the gusA and bar gene, indicating both genes are integrated into the genome of seashore paspalum. A chlorophenol red assay was used to confirm that the bar gene was expressed. By application of herbicide BASTA, the herbicide resistance in the transgenic seashore paspalum plants was confirmed.

Sweetpotato is one of the important starch crops, current more considered as an industrial crop rather than food because it has higher starch content (over 80% of biomass), it is used for bio resources for industrial area. In this study, we generated S598A (a mutant gene of oat phytochrome A) sweetpotato plant using Agrobacterium-transformation method. Morphological characteristics of S598A plant were compared with the wild type sweetpotato, S598A had darker green leaves, increased chlorophyll content higher than to two-fold, delayed leaf senescence, shorter plant height (60% shorter than that of the wild type), more number of leaves and petioles about 1.8-fold, shorter petiole length (30% shorter), 1.2-fold more branches and 1.6-fold thicker stem diameters. From this study, S598A plants with such phenotypic characteristics might be able to use the solar energy efficiently, to have increased tolerance to biotic and abiotic stresses and finally to increase productivity (not only starch yield but also root biomass yield). S598A sweetpotato lines are under field trials.