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( Xiang Min Piao ),( Seong Yel Choi ),( Young Ho Kim ),( Yong Hwa Lee ),( Kwang Soo Kim ),( Young Seok Jang ),( Yoon Sup So ),( Hong Sig Kim ) 한국육종학회 2013 Plant Breeding and Biotechnology Vol.1 No.1
Rapeseeds have many health benefits because its oil is rich in polyunsaturated and monounsaturated fatty acids, tocopherols and phytosterols. The objective of this research was to examine a possible genetic variation of oil, fatty acids, tocopherols and phytosterols in eight rapeseed varieties, and the effect of locations on expression of those chemical compounds. In this study, effects of variety x location interaction was significant for palmitic, stearic, oleic, linoleic, linolenic, eicogenic and erucic contents but not for oil content, where variations were mostly observed between the two locations. The major source of variation in most fatty acids was attributed by variation among varieties. Variation between two locations was much less for tocopherols and phytosterols than that for oil and fatty acids. Instead, variation in residual effect was much higher in tocopherols and phytosterols demanding more number of replication to achieve same level of statistical precision as oil and fatty acids. Correlation analyses confirmed that some of the chemical compounds can be a target for indirect selection.
( Xiang Min Piao ),( Jong Wook Chung ),( Gi An Lee ),( Jung Ro Lee ),( Gyu Taek Cho ),( Ho Sun Lee ),( Kyung Ho Ma ),( Jing Guo ),( Hong Sig Kim ),( Sok Young Lee ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.4
Eggplant (Solanum melongena L.) is an excellent source of vitamins A and C and of flavonoid compounds, which are important antioxidant components believed to reduce the risk of various diseases. We investigated the antioxidant activity and flavonoid content in eggplant leaves and fruits to identify genetic resources with high antioxidant capacity for use in food or as feed additives, and also determined the influence of days to flowering, leaf blade colors, and latitudes of origin on the antioxidant activity and flavonoid content in eggplant leaves. The accessions originating from 45°N showed the highest flavonoid contents (AVG. = 15.4 μg mg-1) followed by accessions from 30°~45°N (AVG. = 13.0 μg mg-1), 15°~30°N (AVG. = 11.0 μg mg-1), and 0°~15°N (AVG. = 9.5 μg mg-1). The same pattern was also found in 2,2`-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 1,1-diphenyl-2- picryl-hydrazil (DPPH) antioxidant activities. High ABTS and DPPH activity and flavonoid content were found in the early-flowering accessions. All flavonoids of the greenish violet leaves were significantly higher than those of green leaves. The flavonoid concentration in eggplant leaves was 10 to 20 fold greater, at an average of 15.6 μg mg-1, than that of the fruit (AVG. = 0.9 μg mg-1). Taken together, eggplant leaves represent a potential source of natural antioxidants due to their high flavonoid content.
( Xiang Min Piao ),( Seong Yel Choi ),( Young Seok Jang ),( Yoon Sup So ),( Jong Wook Chung ),( Sok Young Lee ),( Jae-hyun Jong ),( Hong Sig Kim ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.1
Sunflower is one of the most widely cultivated oil crops. It produces seeds which have abundant health benefits. The objective of this research was to determine the effects of two growing years and five planting dates on agronomic traits and chemical compositions in sunflower accessions. In this study, genotype by year interaction was significant for days to flowering, weight of seeds per plant, oil, palmitic acid, stearic acid, oleic acid, linoleic acid, all tocopherol and phytosterol components. The major source of variation in most agronomic traits and chemical compositions in sunflower was attributed by variation among genotypes. Days to flowering, head length, and weight of seeds per plant decreased when planting date was delayed. Oil content, stearic acid, oleic acid, α-tocopherol, total tocopherol, β-sitosterol, and total sterol contents decreased but linoleic acid increased when planting date was delayed. From this study, valuable information will be provided for sunflower breeders and growers in developing and producing functional food resources and products.
Xiang-Min Piao,Jong-Wook Chung,Gi-An Lee,Hong-Jae Park,Kyung-Ho Ma,Jung-Ro Lee,Hee-kyoung Kang,Yeon-Gyu Kim,Sok-Young Lee 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Eggplant (Solanum melongena L.) is an excellent source of vitamin A and C as well as flavonoid compounds, which are important antioxidant components that may reduce the risk of diseases. In this study, we investigated ABTS, DPPH activity and flavonoid contents in eggplant leaves and fruits to identify genetic resources with high antioxidant capacity for use in food or as feed additives. A total of 102 eggplant accessions were classified into four groups by latitude of their origins: 0°~15° N (8 accessions), 15°~30° N (19 accessions), 30°~45° N (34 accessions), and 45°~60° N (41 accessions). The accessions originated from 45°~60°N showed the highest flavonoid contents (AVG. = 15.4 μg mg-1) followed by accessions originated from 30°~45° N (AVG. = 13.0 μg mg-1), 15°~30°N (AVG. = 11.0 μg mg-1) and 0°~15°N (AVG. = 9.5 μg mg-1). Same pattern was also found in ABTS and DPPH antioxidant activities. High ABTS, DPPH activity and flavonoid contents were found in the early-flowering accessions. All flavonoids of the greenish violet leaves were significantly higher than those in green leaves. The flavonoid concentration in eggplant leaves with an average of 15.6 μg mg-1 increased from 10- to 20-fold as compared with their fruit (AVG.=0.9 μg mg-1). In conclusion, eggplant leaves represent a potential source of natural antioxidants due to their very high flavonoid contents.
도라지 잎 홍차 및 녹차 제품의 항산화활성 폴리페놀과 플라보노이드 비배당체 함량
Xiang Min Piao,Ying Yu,Sin Hee Han,Sang Won Lee,Seon Woo Cha,Ying Ping Wang,Jing Guo 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : Invitro antioxidant activity, polyphenol and flavonoid aglycone contents in black and green tea products of balloon flower leaves were investigated to provide valuable information for the further development and utilization of resources of Platycodon grandiflorum. Methods and Results : Flavonoid aglycone contents were investigated using HPLC (SHIMADZU, Japan) with a hypersil ODS column (125 mm × 4 mm, 5-μm particle, HP). DPPH and ABTS radical scavenging activities were measured by method of Lee & Lee (2004) with slight modification. Antioxidant activity, polyphenol and flavonoid contents in green tea were significantly higher than these in black tea. PC analysis indicated that first principal components explained 79.9% of the total variability for five traits investigated. PC2 explained 19.7% of the variation. Conclusion : It can be concluded from these results that these characteristics can reveal the active compound variation of black and green tea products of balloon flower leaves. These results provide scientific evidence for the utilization of balloon flower leaves.
Xiang-Min Piao,Yun-Ho Lee,Seong Jin Kim,Hang-Lin Song,Sang-Young Nam,In-Jae Kim,Hong-Sig Kim 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
This study was conducted to examine the variations of seed hull color characteristics, the oil contents and fatty acid composition in 275 sunflower germplasms. The seed hull of sunflower germplasms were classified into 4 colors of white, black, grey, and brown. The grey color of seed hull was the highest percentage of 33.8%, whereas the white color of seed hull was the lowest percentage of 5%. Average oil content was 22.5% with a range from 11.7% to 45.5%. Average saturated fatty acid contents were 6.9%, while average content of unsaturated fatty acid was 93%. The average contents of fatty acids such as palmitic acid, stearic acid, oleic acid, and linoleic acid were 4.7%, 2.2%, 55.2%, and 38%, respectively. Comparing the oil contents and fatty acids among different seed hull colors, the highest content of oil was with grey seed hull color and the lowest with white seed hull color. Saturated fatty acid were higher in brown seed hull color. Unsaturated fatty acids were higher in grey and black seed hull colors. It could be observed that there was significant negative correlation(r=-0.998**) between linoleic and oleic acid content, and also L-value(Lightness of seed hull color) showed significant negative correlations with oil content, oleic acid content and linoleic acid content.
Variation of saponin contents in Korean Soybean Landraces
Ji-Seok Lee,Xiang-Min Piao,Hyo-Jae Lee,Yeong-Eun Yoo,Sun-Lim Kim,Hong-Sig Kim 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
This study investigated saponin contents according to collection area, seed size and seed color in 293 Korean soybean landraces. Results showed that total group A was 149.8 to 1279.0㎍/g with an average of 484.9㎍/g while total group B saponin content was 2160.1 to 7868㎍/g with an average of 3670㎍/g. Total groups A and B saponin content were ranging from 2502.7 to 8763.9㎍/g with an average of 4154.8㎍/g. The landraces with high group B saponin content were IT226841, IT226761, IT226844 and IT226826. The landraces with low group A saponin content were IT228580, IT228319, IT228308 and IT226841. According to collection areas, the highest amount of saponin content was observed in the landraces collected from North Korea. High total of saponin content was showed by seeds from Gyeonggi-do, followed by Chungcheongbuk-do, Gangwon-do, Gyongsangbuk-do, Chungcheongnam-do Jeollabuk-do and Jeollanam-do. According to seed size, small seeds have the higest saponin contentfollowed by the medium and large size of seeds. For seed color, there was no significant difference in saponin content. The total of saponin content was postively correlated with group A saponin, group B saponin and total of saponin cntent. Among each components, group A saponin showed postive correlations with total of saponin and group B saponin content.
A second order backward semi-Lagrangian scheme for guiding center problems
Xiang Fan Piao,Jae-Min Kwon,Dokkyun Yi,Sang Dong Kim,Philsu Kim 한국산업응용수학회 2013 한국산업응용수학회 학술대회 논문집 Vol.8 No.1
In this study, we develop a class of backward semi-Lagrangian finite difference methods for solving nonlinear guiding center models. A key problem in the time discretization is to find the starting point of the characteristic curves arriving at each grid point, which is a highly nonlinear problem with a self-consistency imposed by the Poisson equation. The proposed method is based on the error correction method recently developed by the au-thors. For the error correction method, we introduce a modified Euler’s polygon and solve the induced asymptotically linear differential equation with the mid-point quadrature rule to get the error correction term. It is proved that the proposed method is iteration free and has the convergence order 3 in space and 2 in time. In particular, it is shown that the proposed method has a good performance in computational cost together with a superior mass conservation and a similar conservation in the total kinetic energy compared to the conventional second-order iteration methods.
( Jae Young Song ),( Xiang Min Piao ),( Yu Mi Choi ),( Gi An Lee ),( Jong Wook Chung ),( Jung Ro Lee ),( Yeon Ju Jung ),( Hong Jae Park ),( Myung Chul Lee ) 한국육종학회 2013 Plant Breeding and Biotechnology Vol.1 No.4
Assessment of the genetic variation and biochemical traits among various germplasm collections are necessary for utilization of valuable genetic resource and effective strategies of germplasm conservation. The aims of this study were to analyze the genetic diversity using SSR markers and compare protein, oil content and fatty acid composition of about 185 soybean germplasm which is comprised of Korean landraces and collections from six different global regions. Seventy two SSR markers were selected based on their distribution on the 17 genetic linkage groups of soybean. A total of 784 alleles were detected from all accessions, with an average of 10.9 alleles per microsatellite locus. The genetic diversity observed was high wherein three distinct groups were formed containing several subgroups according to their geographic origins. Biochemical contents assay revealed significant differences in their protein and oil contents. Generally, the crude protein content was highest among India and Myanmar collections, while oil content was highest among accessions from USA and China. A negative correlation was observed between protein and oil contents, and between oleic and linolenic acids. The highest value observed for biochemical content among all germplam tested was 45.8% for crude protein, 26.7% for crude oil and 35.7% for oleic acid composition. Our study provided a better understanding of genetic relationships and geographical origin among various germplasm collections, and it could contribute to more efficient utilization of valuable genetic resources.