• Bulletin of the Korean Chemical Society
• /
• v.32 no.1
• /
• pp.319-320
• /
• 2011

• Horticulture, Environment, and Biotechnology : HEB
• /
• v.59 no.6
• /
• pp.919-927
• /
• 2018

To compare the antioxidant properties and flavonols in various parts; dry skin (DS) and edible portion (EP), of 8 red onions (Allium cepa L, ROs), total content of phenolics (TPC), flavonoids (TFC), and anthocyanins (TAC) and DPPH radical scavenging properties were estimated and the content of six flavonols were quantified by HPLC-PDA analysis. The major component of DS and EP of RO was quercetin and quercetin-4'-glucoside, respectively. Score plots of the PCA and PLS-DA were segregated by flavonols content and antioxidant properties according to the EP and DS of ROs. Loading plot of the PCA showed that the quercetin and sum of flavonol content were highly correlated with antioxidant activity of ROs. Therefore, flavonol content and antioxidant activity can be used as markers for distinct parts of ROs.

• Food Science and Preservation
• /
• v.4 no.3
• /
• pp.259-264
• /
• 1997

To improve freshness of onion(Allium cepa), it was packed with various packaging films and stored at 5$^{\circ}C$ until 52 days. During the storage, internal gas composition, weight loss, spout ratio, decay ratio, surface color were determined. The used packaging films are two-perforated LDPE (control), LDPE, CPP/OPP/PE, Nylon/PE and Ag-zirconium filled LDPE. Onions were prepared by peeling or dipping in GFSE(grape fruit seed extract) and packed under vacuum or atmosphere with the selective films. Anaerobic condition was shown in the Nylon/PE package after 4 days and, thus weight loss, sprout ratio and color were considerably poor. All onions in the vacuum package after 15 days were spouted. Onions in CPP/OPP/PE and functional film(Ag-zirconium filled LDPE) package showed aerobic respiration until 52 days. Thus, the quality of onions in these packages was superior to the control.

• Korean Journal of Breeding Science
• /
• v.41 no.4
• /
• pp.468-473
• /
• 2009

Fluorescence in situ hybridization (FISH) and genomic in situ hybridization (GISH) were used for chromosome analysis of hybrids (2n=16) between onion (Allium cepa L., 2n=2X=16) and welsh onion (A. fistulosum L., 2n=2X=16). 5S rDNA, 45S rDNA, and tandemly repeated DNA (TSD) sequence were used as probes for FISH analysis. A. fistulosum specific DNA probe of telomeric repeats and A. fistulosum DNA were used for GISH analysis. In the analysis of meiotic chromosome GISH revealed that hybrids have 7 bivalants and 2 univalents chromosome and 2 univalents were derived from A. fistulosum chromosomes. In somatic chromosomes of hybrid each 8 chromosomes were derived from A. cepa and A. fistulosum, respectively. FISH signal of 45S rDNA probe in A. fistulosum was detected at secondary constriction of chromosomes, while FISH signal in A. cepa was observed in both secondary constriction and telomere of chromosomes. TDS signals in A. fistulosum chromosomes were detected at all subtelomeric of 8 chromosomes and also in 2 pericentromeric of the chromosomes, whereas TDS signals in A. cepa were observed only in subtelomeric in all chromosomes. The pattern of TDS signal in hybrid chromosomes was similar to those of A. fistulosum chromosomes.

• The Korean Journal of Food And Nutrition
• /
• v.28 no.2
• /
• pp.247-252
• /
• 2015

Three different Allium plants, including wild garlic (Allium monanthum Max; AMM), onion (Allium cepa L.; ACL) and green onion (Allium fistulosum L; AFL), have been widely used as spicy food in daily life. This study was attempted to investigate the properties of antioxidant, whitening and anti-wrinkle activities in water extracts in Allium plants. The antioxidant, whitening and anti-Wrinkle activities were evaluated by performing DPPH and ABTS radical scavenging activities, inhibitory effects on tyrosinase, and elastase, respectively. The water extract (10 mg/mL) of onion, wild garlic and green onion exhibited DPPH radical scavenging activities of 28.46%, 28.45%, and 15.91%, respectively. The inhibitory effects of tyrosinase activities by wild garlic, green onion, and onion were increased by heating the extracts at $90^{\circ}C$. Additionally, the wild garlic extract showed higher elastase inhibitory activity than those of other plant extracts. These results suggest that water extracts of Allium plants may be useful as potential sources of beauty foods due to higher antioxidant, anti-melanin and anti-wrinkle activities.

• Journal of Plant Biology
• /
• v.31 no.2
• /
• pp.113-119
• /
• 1988

The effects of the defoliant and desiccant dimethipin(2,3-dihydro-5,6-dimethyl-1,4-dithiin-1,1,4,4-tetraoxide) on the passive permeability and osmotic ground value of onion(Allium cepa L.) epidermal cells were investigated by plasmometric method. The osmotic ground value and the water permeability of onion epidermal cells were decreased by 9.8% and 41.2%, respectively, and the passive permeabilities of nonelectrolytesurea, methylurea, ethylurea and malonamide-were also decreased by the range of 15.7%∼57.8% after treatment with 10-3M dimethipin. After treatment with 10-4M dimethipin, the osimotic ground value and the solute permeability of onion epidermal cells were also decreased by 3.7% and 24.5%∼48.8%, respectively, but the water permeability of onion epidermal cells was increased by 8.3%. It was suggested that dimethipin treatment modified the cell membrane of onion epidermis.

• Korean Journal of Agricultural Science
• /
• v.42 no.4
• /
• pp.313-318
• /
• 2015

In the year 2013, onions cultivation in Jeonnam province suffered by frost-pillar damage. To reveal the aspects of the cause and outbreak, we surveyed those damaged areas. Usually the frost-pillar damage occurred in February. But the outbreak aspect is so unforeseeable. In 2013, the damage was shown as 10.6% in onion fields including paddy fields, but no damage was noticed in 2014. The damage was noticed as 77.8% in paddy fields and 30.1% in upland. And, by the difference of the onion transplanting date, it occurred as 0.7% by the middle of November to the early of November, 22% by the middle of November and 69.0% by the early of December. If one performed the supplementary planting at $3^{rd}$ week of February, the highest survival percent was observed as 53.3%. If the date is early, another frost-pillar damage was occurred. If it's late, the damaged plant was perished with dry. In any case, we found improper transplanting caused the yield decrease. Therefore, we recommend the timely transplanting is the most important way for the prevention of frost-pillar damage in the onion cultivation.

• Research in Plant Disease
• /
• v.17 no.2
• /
• pp.222-224
• /
• 2011

The sclerotium rot of onion (Allium cepa L.) was occurred sporadically in the farmer's fields at Daehap, Changnyeong in Korea. The typical symptom was water-soaking on the bulb, stem and leaves and then rotting, wilting, blighting and the infected plants eventually were rotted and died. The sclerotia were globoid, 1-3 mm, and white to brown. The optimum temperature for mycelial growth and sclerotial formation on PDA was $30^{\circ}C$. The hyphal width was 4-9 ${\mu}m$. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics, ITS rDNA sequence analysis, and pathogenicity, this fungus was identified as Sclerotium rolfsii Saccardo. To our knowledges, this is the first report of sclerotium rot on onion caused by S. rolfsii in Korea.

• Food Science and Preservation
• /
• v.8 no.4
• /
• pp.362-366
• /
• 2001

This study was conducted to reduce degradation of marketability by the rot and discolor of onion bulbs under room temperature from 1977 to 1998. Allium cepa cv. Changnyungdeago, late strain, was used for the test at the storage condition of non-shading, 55% and 95% shadings. The results obtained are as follows: The mean temperature was maintained lowly 1.0∼2.9$\^{C}$ in 55% and 2.0∼3.8$\^{C}$ in 95% shadings in contrast to nun-shading, but the relative humidity was a tittle higher in high shading than other shading condition. The illumination and color density maintained lowly in high shading. After 21 days of storage, the rate of discolored onion bulbs was significantly higher in non-shading(90.0%) than 55%(35.7%) and 95%(13.3%) shadings. The rotting rate by the end of August was a little decreased at 55%(25.4%) and 95% shadings(26.5%) in contrast to non-shading(28.9%), and total weight loss was maintained lowly in high shading.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.22 no.4
• /
• pp.233-238
• /
• 2020

Process-based model (PBM), based on the interactions between endogenous physiological processes and many environmental factors, can be a powerful tool for estimating crop growth and productivity. Carbon acquisition and biomass accumulation are the main components in PBM, so it has become important to understand and integrate gas exchange process in crop model. This study aimed to assess the applicability of FvCB model (a leaf model of C3 photosynthesis proposed by Farquhar, von C aemmerer, and Berry (1980)) in onion (Allium cepa L.). For parameterization, two early-maturing onion cultivars, 'Singsingball' and 'Thunderball', grown in a temperature gradient plastic film house, were used in measuring leaf net CO2 assimilation rate (A), and then, parameter estimation was carried out for four parameters including Vcmax (maximum rate of carboxylation), Jmax (maximum rate of electron transport), TPU (rate of triose phosphate utilization), and Rd (Dark respiration rate). The gas-exchange model calibrated in this research is expected to be able to explain the photosynthetic responses of onion under various environmental conditions (R2=0.95***).