Earticle

Antioxidant activity was investigated in order to investigate the possibility of using food additives or medicines using Cymbidium faberi. The DPPH radical scavenging activity method was used to measure the antioxidant activity of C. faberi extracts, and it was possible to arrange Chinese C. faberi, Japanese C. faberi and Korean C. faberi in order of inhibition rate. The total polyphenol contents of C. faberi extracts were measured, and it was possible to arrange Chinese C. faberi, Japanese C. faberi and Korean C. faberi in order of total polyphenol content.

The study was conducted to evaluate the antioxidant activity by DPPH assay in leaves of Aloe vera with different developmental stages and preconditioning processes such as cutting direction, washing water temperature, and dry period for promoting bioactive utility. Antioxidant activity was increased in longer leaves than younger leaves. However, there were no significant differences in the antioxidant activities by DPPH assay of leaves with different cutting directions which was segmented transversely or longitudinally and washing water temperature at 10℃ and 40℃, and dry period at room temperature for 7 days after harvesting and first-washing. The results indicated that leaf developmental stages might be the most important factor compared to preconditioning processes in terms of the bioactive utility of Aloe vera.

The study was conducted to understand the process of fruit development and estimate harvesting time in a red-flesh kiwifruit cultivar, 'Hongyang', 3 years old planted in the plastic house of a farm located in Jeju city from early March, 2015 to mid November, 2016. Cultural practices including artificial pollination, canopy management, fertilization management, and chemical spray were under the guideline of a general management. The developmental stages of vine and fruits were classified by BBCH (Biologische Bundesanstalt, Bundessortenamt und Chemische Industrie) scale and compared to days after anthesis DAA). Fruit size was measured DAA one month and two months and fruit fresh weight and dry matter were measured DAA two months, respecively, thereafter at an interval of 20 days, and additionally at an interval of 10 days from DAA 182 estimated at harvest. Fruit size had been increased by the final harvesting time, however fruit fresh weight and dry matter were highest at 110.9 g and 18.2% DAA 182 and 187, respectively and decreased thereafter a little bit. Soluble sugars was increased DAA 121 gradually and DAA 182 very rapidly. Starch content was highest DAA 141 at 20.9 mg·g-1 FW, decreased thereafter gradually. The resutls indicated that ‘Hongyang' kiwifruit might have an optimum harvest around DAA 182 estimated by BBCH scale at 85.

The study was conducted to investigate the effects of light sources and foliar spray by magma seawater on growth and quality characteristics of cherry tomato (Solanum lycopersicum L.) in a closed-type plant factory system. Three-band radiation type fluorescent (FL) lamps and high-intensity light emitted diodes (LED) with a 12-hours photoperiod were used and the light intensities were 120 μ mol·m-2·s-1 and 343 μmol·m-2·s-1, respectively. ED (electric desalter) mineral water extracted from magma seawater was used and was sprayed one time per week. Nutrient film systems with three layers were used for plant growth. Environmental conditions, The electrical conductivity and pH maintained at 1.5 dS·m-1 and 5.5-6.5, respectively. Temperature and relative humidity inside the plant factory maintained at 20-28℃ and 40-60%, respectively, and carbon dioxide is not controlled. The growth (plant height, number of fruit, fruit diameter, fruit width, flowering date, harvest date, fresh weight and dry weight) and quality (brix, mineral concentration and lycopene content) characteristics and lycopene contents of cherry tomato were analyzed. The plant height, flowering time and harvest date were faster at LED. The number of fruit was more at LED, but was not affected by spray. The fruit diameter showed no significant difference among the treatments. The fruit width was largest at FL and no spray and the fresh and dry weights of fruit were highest at FL and no spray. However the yield and brix were highest at LED and no spray. The lycopene content was higher than that of FL and highest at LED and spray. From the above results, we concluded that the use of LED is better than FL for growth, however, the use of LED and ED mineral is better for quality of cherry tomato in a closed-type plant factory.

This study was compared to contents of nobiletin and tangeretin in peel and juice of immature and mature fruit of ‘shiikuwasha and 'shiranuhi' mandarin hybrid for evaluate functional materials. The nobiletin content of non-heating house in the peel and juice was higher than heating house, and there was no difference in the content of the maturing period. However, there was no difference in content of tangeretin was not difference between two house, and during the maturing period. In case of peel, the content of nobiletin and tangeretin in 'Shikuwasha' was higher than the 'shiranuhi' mandarin hybrid, and the immature fruit than the mature fruit. Their content of the juice was not difference between the houses, but was difference as the mature period. Their content of non-mature fruit was higher than the mature fruit, and nobiletin was about ten times than the 'Shiranuhi' mandarin hybrid, but was not difference in mature fruit. The content of tangeretin in non-maturing fruit of 'shiikuwash' was about 17 times and was about two times in the maturing fruit than the 'shiranuhi' mandarin hybrid. These experiment's results showed that the contents of nobiletin and tangeretin in the 'Siranuhi' mandarin hybrid cultivated in Jeju was 10 times lower than 'shiikuwash'. Therefore 'siranuhi' mandarin hybrid cultivated in Jeju was not suitable for functional materials.