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Seok-Hyeon Nahm 한국작물학회 2007 Journal of crop science and biotechnology Vol.10 No.2
Phylogenetic relationships in Korean watermelons were evaluated by genetic similarity coefficients using 15 SSR, 14 SCAR, and 14 CAPS markers. The SSR markers were selected from previously reported melon and watermelon SSRs through testing polymorphisms within a set of commercial F1 varieties. The SCAR and CAPS markers were developed from polymorphic AFLP markers between inbred lines 'BN4001' and 'BN4002'. From the AFLP analysis, 105 polymorphic fragments were identified between the inbred lines using 1,440 primer combinations of EcoRI+CNNN and XbaI+ANNN. Based on the sequencing data of these polymorphic fragments, we synthesized sequence specific primer pairs and detected clear and reliable polymorphisms in 27 primer pairs by indels (insertion/deletion) or RFLP. A total of 43 sequence-based PCR markers were obtained and polymorphic information content (PIC) was analyzed to measure the informativeness of each marker in watermelon varieties. The average PIC value of SCAR markers was 0.41, which was similar to that of SSR markers. Genetic diversity was also estimated by using these markers to assess the phylogenetic relationships among commercial varieties of watermelon. These markers differentiated 26 Korean watermelon varieties into two major phylogenetic groups, but this grouping was not significantly correlated with their morphological and physiological characteristics. The mean genetic similarity was 66% within the complete set of 26 commercial varieties. In addition, these sequence-based PCR markers were reliable and useful to identify cultivars and genotypes of watermelon. Phylogenetic relationships in Korean watermelons were evaluated by genetic similarity coefficients using 15 SSR, 14 SCAR, and 14 CAPS markers. The SSR markers were selected from previously reported melon and watermelon SSRs through testing polymorphisms within a set of commercial F1 varieties. The SCAR and CAPS markers were developed from polymorphic AFLP markers between inbred lines 'BN4001' and 'BN4002'. From the AFLP analysis, 105 polymorphic fragments were identified between the inbred lines using 1,440 primer combinations of EcoRI+CNNN and XbaI+ANNN. Based on the sequencing data of these polymorphic fragments, we synthesized sequence specific primer pairs and detected clear and reliable polymorphisms in 27 primer pairs by indels (insertion/deletion) or RFLP. A total of 43 sequence-based PCR markers were obtained and polymorphic information content (PIC) was analyzed to measure the informativeness of each marker in watermelon varieties. The average PIC value of SCAR markers was 0.41, which was similar to that of SSR markers. Genetic diversity was also estimated by using these markers to assess the phylogenetic relationships among commercial varieties of watermelon. These markers differentiated 26 Korean watermelon varieties into two major phylogenetic groups, but this grouping was not significantly correlated with their morphological and physiological characteristics. The mean genetic similarity was 66% within the complete set of 26 commercial varieties. In addition, these sequence-based PCR markers were reliable and useful to identify cultivars and genotypes of watermelon.
Hee Jung Lee,Seok Hyeon Nahm,Byung Joon Ahn,Hyang Young Joung,Byung Whan Min 한국원예학회 2004 Horticulture, Environment, and Biotechnology Vol.45 No.1
A heterologous cDNA probe from Petunia hybrida was used to isolate dihydroflavonol-4-reductase (DFR)-encoding cDNA clone from Dianthus caryophyllus. Comparison of the coding region of this DFR cDNA sequence including the sequences of Zea mays, Anthirrinum majus, Petunia hybrida, Matthiola incana, Callistephus chinensis, and Rosa hybrido reveals a similarity higher than 75% at the amono acid level. The DFR transcript is G/C rich in monocotyledonous plants show a strong codon bias preferring codons with a G or C in the third position. The function of this nucleotide sequences were verified by comparison with amino acid sequences of the amino-terminus and tryptic peptides from purified plant enzyme, by Northern blotting with mRNA from wild type and mutant plants and by in vitro expression yealding an enzymatically active reductase. Northern blot analysis of the DFR wild-type and mutant lines showed thai the lack of DFR activity in the stable acyanic mutants is clearly caused by a transcriptional block of the DFR gene.
Hot Pepper Genome : Basic Genetic Tools for Molecular Breeding
Kang,Byoung Cheorl,Nahm,Seok Hyeon,Huh,Jin Hoe,Lee,Je Min,Lee,Moon Hwan,김병동 한국생명과학회 2000 한국생명과학회 학술발표회 Vol.29 No.-
Pepper fruits are consumed as food additives for their unique color, pungency, and aroma in many regions of the world, particularly in Asia and South and Central America. Five species of Capsicum peppers, including C. annuum, C. chinense, C. baccatum, C. frutescens and C. pubescens, are cultivated in different parts of the world. Among them C. annuum is most widely grown in both Asia and worldwide. It includes most of the Mexican chile peppers, most of the hot peppers of Africa and Asia, and various cultivars of sweet peppers grown in temperate regions of Europe and North America. During the last decade, the construction of molecular linkage map has become an essential tool for plant molecular genetics and breeding research. Despite the pepper genome research is being conducted by only a small number of research groups worldwide, development of a linkage map in Capsicum has been greatly aided by use of tomato-derived RFLP probes, We have constructed a molecular linkage map of pepper (Capsicum spp.) in an interspecific F2 population of 107 plants with 150 RFLP and 430 AFLP markers. The resulting linkage map consists of 11 large (206 - 60.3 cM) and 5 small (32.6 - 10.3 cM) linkage groups covering 1,320 cM with an average map distance between framework markers of 7.5 cM. Most (80%) of the RFLP markers were pepper-derived clones and these markers were evenly distributed across the genome. By using 30 primer combinations, 444 AFLP markers were generated in the F2 population. The majority of the AFLP markers clustered in each linkage group, although PstI/Msel markers were more evenly distributed than EcoRI/MseI markers within the linkage groups. We have developed SSR markers and these markers were informative for pepper genome research. Genes for biosynthesis of carotenoids and capsaicinoids were mapped on our linkage map. This map will provide the basis of studying secondary metabolites in pepper.
열연 후 공냉처리된 API X70강의 수소취성에 미치는 전기화학적 수소장입시간의 영향
성치운 ( Chi Eun Sung ),전현지 ( Hyeon Jee Jeon ),이진경 ( Jin Kyung Lee ),손인수 ( In Soo Son ),이상필 ( Sang Pill Lee ),이석철 ( Seok Cheol Lee ),백운봉 ( Un Bong Baek ),남승훈 ( Seung Hoon Nahm ),배동수 ( Dong Su Bae ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.11
This study investigated the effect of the hydrogen charging time under the electro-chemical hydrogen charging condition on hydrogen embrittlement of hot-rolled and then air-cooled API X70 steel. Tensile and V-notch Charpy impact test specimens were held for 0 h, 2 h, 4 h, and 10 h in the electrolyte pot during electro-chemical hydrogen charging processes and then both of tensile and impact tests were completed at room temperature. The microstructure consisted of fine acicular ferrite, coarse polygonal ferrite and pearlite. The yield and tensile strength decreased slightly and elongation decreased rapidly up to 2 h holding time and then decreased slowly with the holding time. The V-notch Charpy impact value decreased continuously up to 4 h holding time and then increased slightly up to 10 h. The morphology of the fracture surface changed from a ductile type to a brittle type with the hydrogen charging time. Secondary cracks were observed in the hydrogen charged specimens. No external cracks were formed at the specimen surface of the tensile tested with 0 h holding time, but many external cracks were observed at the surface of the hydrogen charged specimens. Cracks were observed in the nominal and parallel directions to the tensile direction at the longitudinal cross-section region near the tensile fractured surface with the 2 h held specimen.
Symposium 7 : Plant Biochemistry ; Hot pepper genome and secondary metabolic pathways
김병동 ( Byung Dong Kim ),( Byoung Cheorl Kang ),( Seok Hyeon Nahm ),( Jin Hoe Huh ),( Hyun Sook Yoo ),( Jae Woong Yu ),( Min Woo Kim ),( Shin Je Kim ),( Soo Hyun Kim ),( Kwon Su Ha ),( Moon Hwan Lee ) 생화학분자생물학회 2000 생화학분자생물학회 추계학술발표논문집 Vol.2000 No.-