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Development Of SNP Markers And Genome-wide Association Study In Chinese Cabbage
Wenxing Pang,Nirala Ramchiary,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Genome-wide association study (GWAS) is a very powerful method to identify the natural allelic variation present in crop plants causing variation to economically important traits. The recent advances in high throughput genotyping and sequencing technology supplemented greatly to GWAS. Taking this advantage, we selected a total of 382 Chinese cabbage inbred lines for GWAS study. The selected inbred lines are being sequenced using next generation sequencing technology to develop genome wide gene specific single nucleotide polymorphism markers. The morphological and quality traits data were taken from field grown inbred lines. The phenotype and genotype association study will be done with more environmental grown data’s and developed SNP. At the end of this project, gene specific SNP markers will be developed for Chinese cabbage breeding for morphological and quality traits.
Genetic Detection of Clubroot Resistance Loci in a New Population of Brassica rapa
Wenxing Pang,Shan Liang,Xiaonan Li,Pengpeng Li,Sha Yu,임용표,Zhong Yun Piao 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.6
Clubroot is one of the most serious diseases affecting Brassica crop production worldwide. In order toidentify the location of clubroot resistance genes in Chinese cabbage, we constructed a linkage map for an F2 populationderived from a cross between a resistant turnip inbred line, ‘Siloga’ (B. rapa ssp. rapifera), and a susceptible Chinesecabbage inbred line, ‘BJN3’ (B. rapa ssp. pekinensis). The newly developed genetic map included 207 markers andcovered 1151.7 cM. In combination with clubroot resistance tests from the field, the data allowed us to identify threequantitative trait loci of clubroot resistance, using a composite interval mapping method. Clubroot resistance genesQS_B1.1, QS_B3.1, and QS_B8.1 were located on chromosomes A1, A3, and A8, respectively, of B. rapa. Theircontribution rates were 8.18%, 70.55%, and 7.28%, respectively. QS_B1.1 was a novel locus of clubroot resistance,independent of any published clubroot-resistance loci. QS_B3.1 was first detected in ‘Siloga,’ mapped to the previousCRb and CRa region, whereas QS_B8.1 was closely linked to Crr1b. Epistatic interactions with additive effects weredetected between QS_B3.1 and QS_B8.1.
Mapping QTLs of resistance to head splitting in cabbage (Brassica oleracea L. var. capitata L.)
Wenxing Pang,Xiaonan Li,Seong Ho Lee,Dasom Kim,Sang Heon Oh,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Cabbage head splitting can greatly affect both the quality and commercial value of cabbage (Brassica oleracea). To detect the genetic basis of head-splitting resistance, a genetic map was constructed using an F2 population derived by crossing “748” (head-splitting-resistant inbred line) and “747” (head-splitting-susceptible inbred line). The map spans 830.9cM and comprises 270 markers distributed in nine linkage groups, which correspond to the nine chromosomes of B. oleracea. The average distance between adjacent markers was 3.6cM. A total of six quantitative trait loci (QTLs) conferring resistance to head splittingwere detected in chromosome 2, 4, and 6. Two QTLs, SPL-2-1 and SPL-4-1, on chromosomes 2 and 4, respectively, were detected in the experiments over 2 years, suggesting that these two potential loci were important for governing the head-splitting resistance trait. Markers BRPGM0676 and BRMS137, which were tightly linked with head-splitting resistance, were detected in the conserved QTL SPL-2-1 region using bulked segregant analysis. Synteny analysis showed that SPL-2-1 was anchored to a 3.18Mb genomic region of the B. oleracea genome, homologous to crucifer ancestral karyotype E block in chromosome 1 of Arabidopsis thaliana. Moreover, using a field emission scanning electron microscope, significant differences were observed between the two parental lines in terms of cell structures. Line “747” had thinner cell wall, lower cell density, larger cell size, and anomalous cell wall structure compared with the resistant line “748”. The different cell structures can provide a cytological base for assessing cabbage head splitting.
Xiaonan Li,Wenxing Pang,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
We investigated the genetic diversity and structure of the 239 fixed lines with 47 simple sequence repeat (SSR) and 109 NGS-generated SNP markers evenly distributed in B. rapa genome. Phylogenetic analysis classified the vegetable fixed lines to four subgroups, with the three types forming a separate and relatively farther cluster. Population structure analysis identified four sub-populations corresponding to geographic origin and morphological traits, and revealed extensive admixture. The vegetable B. rapa fixed lines successfully developed in our study would be valuable materials for multinational B. rapa diversity resources establishment. Understanding the genetic diversity and population structure could be useful for utilization of the representing genetic variation and further genetic and genomic analysis.
Identification of glucosinolate-associated QTLs in cabbage (Brassica oleracea L. var. capitata)
오상헌,최수련,Wenxing Pang,Jana Jeevan Rameneni,이소영,김만선,임수빈,임용표 충남대학교 농업과학연구소 2018 Korean Journal of Agricultural Science Vol.45 No.1
Glucosinolates are one of the important plant secondary metabolites that are produced mainly in Brassicaceae plants. The compounds are primarily involved in defense responses to biotic and abiotic resistance in plants and play important biological roles during plant growth and development. In this study, the glucosinolate profiles in leaves of two different Brassica oleracea populations were compared using high-performance liquid chromatography (HPLC). The nine major glucosinolates compounds in cabbage leaves were identified as belonging to the aliphatic and indolic groups. Among them, sinigrin, which belongs to the aliphatic group, was recorded to be 41% whereas glucobrassicin and 4-methoxyglucobrassicin, which belong to the indolic group, were recorded to be 53.8%. In addition, we performed a genetic analysis to identify regions of the genome regulating glucosinolates biosynthesis in the F3 population of Brassica oleracea. A total of 9 glucosinolates were used for the quantitative trait locus (QTL) analysis. Out of 9, a total of 3 QTLs were identified and they were associated with sinigrin, glucobrassicin, and 4-methoxyglucobrassicin synthesis located in Chromosome 1 and Chromosome 8, respectively. The results of this study will provide valuable information for the breeding of cabbage containing high glucosinolate content, and our next target is to develop component-specific and tightly linked markers for various glucosinolates.
Yoon-Young Kim,Sang Heon Oh,Wenxing Pang,Xiaonan Li,Seong-Jin Ji,Eunho Son,Saehee Han,Suhyoung Park,Eeunhe Soh,Hoil Kim,Yong Pyo Lim 한국원예학회 2017 원예과학기술지 Vol.35 No.2
We organized the scientific names of Chinese cabbage according to the International Code of Nomenclature for algae, fungi, and plants (ICN) and the International Code of Nomenclature for Cultivated Plants (ICNCP). We found that the subspecies name ‘Brassica rapa subsp. pekinensis (Lour.) Rupr.’ was suitable as the scientific name for Chinese cabbage, and we classified B. rapa var. glabra Regel. as its synonym. In addition, B. petsai Bailey is an ‘unrecorded name’ not found in the original description, and therefore is not suitable for use. We conclude that all names based on this name are ‘invalid names’, and should not be used.
Kim, Yoon-Young,Oh, Sang Heon,Pang, Wenxing,Li, Xiaonan,Ji, Seong-Jin,Son, Eunho,Han, Saehee,Park, Suhyoung,Soh, Eeunhe,Kim, Hoil,Lim, Yong Pyo Korean Society of Horticultural Science 2017 원예과학기술지 Vol.35 No.2
We organized the scientific names of Chinese cabbage according to the International Code of Nomenclature for algae, fungi, and plants (ICN) and the International Code of Nomenclature for Cultivated Plants (ICNCP). We found that the subspecies name 'Brassica rapa subsp. pekinensis (Lour.) Rupr.' was suitable as the scientific name for Chinese cabbage, and we classified B. rapa var. glabra Regel. as its synonym. In addition, B. petsai Bailey is an 'unrecorded name' not found in the original description, and therefore is not suitable for use. We conclude that all names based on this name are 'invalid names', and should not be used.