Rural Development Administration

About: Rural Development Administration is a government organization based out in Jeonju, South Korea. It is known for research contribution in the topics: Gene & Population. The organization has 4372 authors who have published 4919 publications receiving 94318 citations.

Deleted copy number variation of Hanwoo and Holstein using next generation sequencing at the population level

Abstract: Copy number variation (CNV), a source of genetic diversity in mammals, has been shown to underlie biological functions related to production traits. Notwithstanding, there have been few studies conducted on CNVs using next generation sequencing at the population level. Illumina NGS data was obtained for ten Holsteins, a dairy cattle, and 22 Hanwoo, a beef cattle. The sequence data for each of the 32 animals varied from 13.58-fold to almost 20-fold coverage. We detected a total of 6,811 deleted CNVs across the analyzed individuals (average length = 2732.2 bp) corresponding to 0.74% of the cattle genome (18.6 Mbp of variable sequence). By examining the overlap between CNV deletion regions and genes, we selected 30 genes with the highest deletion scores. These genes were found to be related to the nervous system, more specifically with nervous transmission, neuron motion, and neurogenesis. We regarded these genes as having been effected by the domestication process. Further analysis of the CNV genotyping information revealed 94 putative selected CNVs and 954 breed-specific CNVs. This study provides useful information for assessing the impact of CNVs on cattle traits using NGS at the population level.

Characterization of catechins, theaflavins, and flavonols by leaf processing step in green and black teas (Camellia sinensis) using UPLC-DAD-QToF/MS

Abstract: Most previous studies have been focused on the variation of tea chemical composition by fermentative processes as well as different cultivars and regions. The detailed changes of flavonoid profiles were described for the first time by each processing step of green and black tea leaves in this study. A total of 24 flavonoid derivatives including catechins, theaflavins, and flavonols were separated and identified from the tea samples based on UPLC-DAD-QToF/MS data and constructed library. Among these, the fragmentation pathway of theaflavins was proposed specifically in positive ionization mode for structural interpretation. During leaf processing, the individual flavonols were changed as diverse patterns according to their aglycone types and glycosylated forms, but their total content showed a slight difference. EGCG and ECG were increased after roasting approximately twofold higher than that of fresh leaves (EGCG, 2709.5 →6085.6; ECG, 1548.0 →2318.2 mg/100 g dry weight, respectively) in green tea while considerably decreased their contents due to oxidation and conversion to theaflavins after fermentation during black tea processing. Especially, the drying steps also found to be factor to influence positively to increase the flavonoid contents in both tea processing. Therefore, this result indicated that detailed conditions of each processing step played important roles in changing the flavonoid profiles from tea leaves.

In Vivo Antihepatotoxic Effects of Ligularia fischeri var. spiciformis and the Identification of the Active Component, 3,4-Dicaffeoylquinic Acid

Abstract: Pretreatment with a methanolic extract of Ligularia fischeri var. spiciformis (Compositae) herb inhibited hepatotoxicities caused by CCl4, D-galactosamine (GalN), α-naphthylisothiocyanate (ANIT), and DL-ethionine in rats. An ethyl acetate (EtOAc) extract fractionated from the methanolic extract showed a strong inhibitory effect. A major component, 3,4- dicaffeoylquinic acid (DCQA), isolated from the methanolic extract was examined for antihepatotoxicity. Pretreatment with DCQA (5 and 10 mg/kg, p.o.) significantly reduced serum aminotransferases (alanine and aspartate), sorbitol dehydrogenase, γ-glutamyltransferase, alkaline phosphatase, and lactate dehydrogenase activities during CCl4- or GalN-induced hepatotoxicity, suggesting that DCQA is a major principle for the antihepatotoxic activity of L. fischeri var. spiciformis. DCQA also partially restored bile flow and reduced total bilirubin and cholic acid concentrations in rats with ANIT-induced cholestasis. Treatment with DCQA inhibited the increase in tr...

Evaluation of Resistance to Ralstonia solanacearum in Tomato Genetic Resources at Seedling Stage.

Abstract: Bacterial wilt of tomatoes caused by Ralstonia solanacearum is a devastating disease that limits the production of tomato in Korea. The best way to control this disease is using genetically resistant tomato plant. The resistance degree to R. solanacearum was evaluated for 285 tomato accessions conserved in the National Agrobiodiversity Center of Rural Development Administration. These accessions of tomato were originated from 23 countries. Disease severity of tomato accessions was investigated from 7 days to 14 days at an interval of 7 days after inoculation of R. solanacearum under greenhouse conditions. A total of 279 accessions of tomato germplasm were susceptible to R. solanacearum, resulting in wilt and death in 70 to 90% of these plants. Two tomato accessions were moderately resistant to R. solanacearum. Only four accessions showed high resistance against R. solanacearum. No distinct symptom of bacterial wilt appeared on the resistant tomato germplasms for up to 14 days after inoculation of R. solanacearum. Microscopy of resistant tomato stems infected with R. solanacearum revealed limited bacterial spread with thickening of pit membrane and gum production. Therefore, these four resistant tomato germplasms could be used in tomato breeding program against bacterial wilt.