• Korean Journal of Medicinal Crop Science
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• v.21 no.5
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• pp.353-360
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• 2013

Korean ginseng (P. ginseng C. A. Meyer) is one of the most important medicinal plant in the world. Understanding genetic variability among the assortment of Korean ginseng is important for breeding. The aim of this study was to molecularly characterize Korean ginseng cultivar and breeding lines through the use of eight previously reported STS markers (MFGp183, MFGp130, MFGp110, UFGp74, UFGp163, MFGp108, MFGp81 and UFGp156). All STS markers produced interpretable electropherograms from 31 accessions consisting of 11 Korean ginseng cultivars and 20 breeding lines. When eight STS markers were combined, we identified to total 19 genetic patterns; in particular, nine cultivars (Chunpoong, Yunpoong, Gopoong, Gumpoong, Sunpoong, Sunone, Cheongseon, Sunhyang, Cheonryang) and 5 breeding lines (G08012, G04079, G04075, G08036, G04110) in ginseng samples can be discriminated from the others. Together with other available markers, these STS markers will contribute to the management of ginseng genetic resources and the protection of breeders' rights.

• Journal of Sericultural and Entomological Science
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• v.45 no.2
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• pp.90-95
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• 2003

This study was carried out to identify of C3G (cyanidin-3-glucoside) from mulberry fruits and quantify with different varieties. C3G of mulberry fruits was extracted with 1％ HCl-MeOH and purified with open column (5${\times}$90cm) which filled with Amberlite IRC-50 ion exchange resin. The $\lambda$max ranges of the purified C3G on UV/vis spectrum were 516nm and 280nm. Also, molecular weight of C3G from mulberry fruits by LC-Mass was determined as 449. From above results, we concluded that anthocyanin pigment of mulberry fruits was C3G only. The cyanidin-3-glucoside (C3G) was separated and quantified by High Performance Liquid Chromatography (HPLC) system using a Nova-Pack C$\_$18/ column. Mean content of the 35 tested accessions was 0.89％. Also fruity characteristics as well as C3G content to select the desirable mulberry varieties for the production of fruit were researched and analyzed. We selected three suitable varieties such as 'Susungppong', 'Kangsun', and 'Jeolgokchosaeng(Chungpuk)'.

• Korean Journal of Breeding Science
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• v.42 no.5
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• pp.502-506
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• 2010

Soybean seed possesses about 15 allergenic proteins recognized by IgEs from soy-sensitive human. The allergenic impact of soybean proteins limit its extensive usage in a broad range of processed foods. Soybean protein P34 or Gly m Bd 30k of the cysteine protease family is one of the major allergen of the soybean seed. P34-null soybean, PI567476, was identified among soybean (Glycine max & Glycine soja Sieb. and Zucc) of approximately 16,226 accessions from USDA soybean germplasm screened. Also, for P34 gene (Williams 82; whole genome sequence cultivar) and P34 null gene (PI567476) comparative analysis of sequences listed in the NCBI database showed the presence of a SSLP (Simple Sequence Length Polymorphism) of 4 base pair. So, a SSLP marker was designed to reveal the polymorphism of the locus. In this study, a population of 339 $F_2$ recombinant inbred lines generated by cross between Taekwang (Glycine max) and PI567476 was used to select $F_{2:3}$ plant of a P34 null gene. The result separation rate Taekwang type, heterozygous type and PI567476 type were shown in 85: 187: 67 since single gene is concerned in as the separation rate of 1:2:1 in $X^2{_{0.05}}=5.99$, df=2. In future, selected plant will identify protein level, whether P34 null protein is equal to P34 null gene.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.41-41
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• 2019

This study was conducted to compare the agronomic traits of well-known colored native soybean germplasms. Recently, we are increasingly interested in colored as various functional ingredient of soybeans have revealed. We used a total of 396 soybean genetic resources, consisting of ten "Seonbijabikong", 110 "Jyinunikong", 276 "Seoritaekong". We sowed on 10th June 2018 at the field of Nongsaensmyeongro in Jeonju city. The average number of days to flowering, days to maturing and days to growth of colored soybean were 53, 84 and 136 days, respectively. Days to flowering of "Seonbijabikong" were ranged from 41 to 50 days with an average 48 days, those of "Jyinunikong" were ranged from 39 to 72 days with an average 52 days. Days to flowering of "Seoritaekong" were ranged from 35 to 63 days with an average 54 days, which were earlier in "Seonbijabikong", and similar with "Seoritaekong" and "Jyinunikong". Days to growth of "Seonbijabikong" were ranged from 125 to 137 days with an average 132 days, those of "Jyinunikong" were ranged from 91 to 144 days with an average 130 days and those of "Seoritaekong" were ranged from 99 to 150 days with an average 139 days. they were shortest in "Jyinunikong" and longest in "Seoritaekong". The distribution of maturity period was from 6th September to 5th November. The maturity period was as early as September and yields were more than 100g per plant, which were all three accessions(IT161905, IT162602, IT269617), "Seoritaekong". They would be useful as breeding materials of colored soybean with early maturity. The 100-seed weight is important characteristics that distinguish the usage of soybeans. "Seoritaekong" and "Seonbijabikong" have large seed characteristics for cooking with rice, "Jyinunikong" has small seed it for medicine. The average 100 seed weight was 35.0g of "Seonbijabikong", 30.8g of "Seoritaekong" and 13.4g of "Jyinunikong", respectively. As for seed coat lust, the ratio of dull was as high as 100% of "Seonbijabikong" and 91% of "Seoritaekong", that of shiny was as high as 77% of "Jyinunikong". Cotyledon color of "Seonbijabikong" were all yellow, that of "Seoritaekong" were 94% of green. The other name of "Seoritaekong" is "Sokcheong", which means that cotyledon color is green. Therefore if cotyledon color of Seoritaekong is not green, it might be misidentified. In the future, we will increase the utilization through evaluation of functional component such as isoflavones and anthocyanins of colored soybean landraces.

• Journal of the Korean Society of International Agriculture
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• v.30 no.4
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• pp.357-369
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• 2018

The Korean common bean (Phaseolus vulgaris L.) has been receiving increased attention as a functional food. The objective of this study was to reveal the phytochemicals genetic variation and antioxidant activity of 209 Korean common bean landraces. Antioxidant activity was evaluated with the DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate), ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid), ferric reducing antioxidant power (FRAP), and superoxide dismutase (SOD) assay. Antioxidant activities among common bean accessions showed wide variation. Four flavonoids (kaempferol, myricetin, quercetin, and naringenin) of the 209 Korean common bean landraces were measured using HPLC. Among them, kaempferol had the highest phytochemicals compared to the other three flavonoids. Using the relative antioxidant capacity index (RACI), it was found out that the IT104587 had the highest antioxidant activity. Meanwhile, in clustering analysis, the Korean common bean landraces were classified into three clusters. Among them, cluster II contained 64 landraces with higher antioxidant activities and phytochemicals than the other clusters, except DPPH. The results could provide information on the valuable Korean common bean landraces for the development of new common bean varieties.

• Korean Journal of Plant Resources
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• v.34 no.2
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• pp.156-165
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• 2021

The in vitro regeneration was established, and the genetic stability among the mother plants (control) and the micropropagated green plants was evaluated using ISSR markers in Imperata cylindrica 'Rubra', Poaceae which containing important bioenergy plants. Green shoots were multiply induced from growing point culture via callus on MS medium supplemented with 0.01 mg/L NAA and 2 mg/L BA, and the shoots were proliferated on the MS medium with rooting. Rooted plantlets were transplanted to the pot with 100% survival rate. Using ISSR markers, somaclonal variation was analyzed in eight mother plants (control), ten green-regenerant cultivated at culture room (ReR) and ten green-regenerant cultivated at field condition (ReF). All ISSRs produced a total of 97 bands, and the scorable bands varied from one to seven with an average of 4.4 bands per primer. The polymorphism rate of ReRs and ReFs was 4.1% and 3.1% respectively, showing higher rate than that of control (0%). The genetic similarity matrix (GSM) among all accessions ranged from 0.919 to 1.0 with a mean of 0.972. According to the clustering analysis, ReFs and mother plants were divided into two independent groups. The results indicate that no clear genetic diversity was detected among regenerated plants, and ISSR markers were useful tool for identification of somaclonal variation of regenerants.

• Journal of Practical Agriculture & Fisheries Research
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• v.3 no.1
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• pp.48-69
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• 2001

A lot of clones of the genus Dioscorea have been introduced from some tropical and subtropical regions since 1997. In 33 clones of water yams (Dioscorea alata L.), some morphological characteristics were investigated at the field. Variation ranges of the total weight and tuber number per stump were within the ranges from 90 to 2,147 g with an average of 610 g ; and 1.3-4.7 with an average of 2.8, respectively. The color tones observed on the tuber-flesh were sorted into 3 color-categories, i.e., white, pale brown and pale purple, and those on leaves were sorted into 3 color-categories, i.e., green, heavy green and purplish green. Intraspecific genetic relationship of 19 variation types of the Yam classified by their external morphological characteristics such as leaf and tuber shape was assessed by DNA using random and specific primers. Twenty two out of 113 primers (100 random[10-mer] primers, two 15 mer [M13 core sequence, and (GGAT)4 sequence]) had been used in PCR-amplification. Only 12 primers, however, were successful in DNA amplification in all of the analyzed plants, resulting in 93 randomly and specifically amplified DNA fragments. The analyzed taxa showed very high polymorphisms(69 bands, 71.0%), allowing individual taxon to be identified based on DNA fingerprinting. Monomorphic bands among total amplified DNA bands of each primer was low under the 50%. Similarity indices between accessions were computed from PCR(polymerase chain reaction) data, and genetic relationships among intraspecific variations were closely related at the levels ranging from 0.66 to 0.90.

• Journal of the Korean Society of International Agriculture
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• v.23 no.5
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• pp.491-496
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• 2011

Breeding for pear resistance to pear psylla (Cacopsylla pyricola) is one of important objective of the National Institute of Horticultural and Herbal Science breeding program. One hundred thirty three accessions from 15 Asian, Chinese and European pear species were investigated for their resistance against pear psylla. The pear psylla resistance was determined based on the following four characteristics: overwintering adult population, the number of eggs and nymphs, and the degree of soot. The different pear species showed varied resistance to pear psylla. Pyrus calleryana and P. betulaefolia indicated the highest antixenosis as ovipositional preference and antibiosis as nymphal feeding and were the most resistant genetic resources. Likewise the European pears (P. communis), 'Conference' and 'Cascade', exhibited little occurrence and damage by pear psylla. These were proved to be promising genetic materials for breeding resistant cultivars because they had good fruit quality and showed resistance to pear paylla. The observed population of overwintering adult, the number of eggs and nymphs of psylla had significant correlation each other.

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.207-207
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• 2022

Eating and cooking quality (ECQ) is one of the most complex quantitative traits in rice. The understanding of genetic regulation of transcript expression levels attributing to phenotypic variation in ECQ traits is limited. We integrated whole-genome resequencing, transcriptome, and phenotypic variation data from 84 Japonica accessions to build a transcriptome-wide association study (TWAS) based regulatory network. All ECQ traits showed a large phenotypic variation and significant phenotypic correlations among the traits. TWAS analysis identified a total of 285 transcripts significantly associated with six ECQ traits. Genome-wide mapping of ECQ-associated transcripts revealed 66,905 quantitative expression traits (eQTLs), including 21,747 local eQTLs, and 45,158 trans-eQTLs, regulating the expression of 43 genes. The starch synthesis-related genes (SSRGs), starch synthase IV-1 (SSIV-1), starch branching enzyme 1 (SBE1), granule-bound starch synthase 2 (GBSS2), and ADP-glucose pyrophosphorylase small subunit 2a (OsAGPS2a) were found to have eQTLs regulating the expression of ECQ associated transcripts. Further, in co-expression analysis, 130 genes produced at least one network with 22 master regulators. In addition, we developed CRISPR/Cas9-edited glbl mutant lines that confirmed the role of alpha-globulin (glbl) in starch synthesis to validate the co-expression analysis. This study provided novel insights into the genetic regulation of ECQ traits, and transcripts associated with these traits were discovered that could be used in further rice breeding.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.36-36
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• 2022

The molecular understanding of resistance and susceptibility of host plants to scab, a most threatful disease to pome fruit production worldwide, is very limited. Comparing resistant line '93-3-98' to susceptible one 'Sweet Skin' at seven time points of 0, 0.5, 1, 2, 3, 4, 8 days post inoculation, RNA-sequencing data derived from infected and mock-inoculated young leaves were analyzed to evaluate the tolerant response and to mine candidate genes of pear to the scab pathogen Venturia nashicola. Analysis of the mapped reads showed that the infection of V. nashicola led to significant differential expression of 17,827 transcripts with more than 3-fold change in the seven pairs of libraries, of which 9,672 (54%) are up- and 8,155(46%) are down-regulated. These included mainly receptor (NB-ARC domains-containing, CC-NBS-LRR, TIR-NBS-LRR, seven transmembrane MLO family protein) and transcription factor (ethylene responsive element binding, WRKY DNA-binding protein) related gene. An arsenal of defense response of highly resistant pear accessions derived from European pear was probably supposed no sooner had V. nashicola infected its host than host genes related to disease suppression like Polyketide cyclase/dehydrase and lipid transport protein, WRKY family transcription factor, lectin protein kinase, cystein-rich RLK, calcium-dependent phospholipid-binding copine protein were greatly boosted and eradicated cascade reaction induced by pathogen within 24 hours. To identify transcripts specifically expressed in response to V. nashicola, RT-PCRs were conducted and compare to the expression patterns of seven cultivars with a range of highly resistant to highly susceptible symptom. A DEG belonging to the PR protein family genes that were higher expressed in response to V. nashicola suggesting extraordinary role in the resistance response were led to the identification. This study provides the first transcriptional profile by RNA-seq of the host plant during scab disease and insights into the response of tolerant pear plants to V. nashicola.