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Development of Plastid InDel Markers to Discriminate Lemons from Other Citrus Groups
Sang Suk Kim,Ho Bang Kim,Kyung Jin Park,Jae Wook Hyun,Cheol Woo Choi,Jae-Ho Joa,Seong Beom Jin,Eun-Sil Kim,Seung Gab Han 한국원예학회 2021 원예과학기술지 Vol.39 No.5
Lemon (Citrus limon), an interspecific hybrid between sour orange and citron, has been widely used as a rootstock along with trifoliate orange. Though lemons are superior to trifoliate orange in terms of their high seed germination rate throughout the year, one of the obstacles to using lemons as rootstocks is the lack of reliable, lemon-specific molecular markers to discriminate buds of the micro-grafted scion from those of the lemon rootstock. In order to obtain lemon-specific molecular markers, we compared the whole-plastid genomes available from four citrus species (lemon, pummelo, sweet orange, and mandarin) and developed seven plastid insertion/deletion (InDel) markers. The plastid InDel markers were applied to 46 citrus accessions that included lemons (17 accessions), grapefruit, mandarin, pummelo, sour orange, orange, papeda, tangor, and tangelo groups. The resulting dendrogram revealed that the citrus accessions used in this analysis could be distinctly classified into seven clusters. Lemons formed a separate cluster and had identical allele sizes for each InDel locus among all accessions investigated. This set of InDel markers could be a useful molecular tool for the rapid and clear discrimination of micro-grafted scions and lemon rootstocks during the production of virus-free citrus trees. The plastid InDel markers with maternal inheritance features can also be used to analyze the phylogenetic origin of various citrus cultivars including lemons.
Study on effect of plasma surface treatments for diamond deposition by DC arc plasmatron.
Kang, In-Je,Joa, Sang-Beom,Lee, Heon-Ju American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>To improve the thermal conductivity and wear resistance of ceramic materials in the field of renewable energy technologies, diamond coating by plasma processing has been carried out in recent years. This study's goal is to improve diamond deposition on Al2O3 ceramic substrates by plasma surface treatments. Before diamond deposition was carried out in a vacuum, plasma surface treatments using Ar gas were conducted to improve conditions for deposition. We also conducted plasma processing for diamond deposition on Al2O3 ceramic substrates using a DC arc Plasmatron. The Al2O3 ceramic substrates with diamond film (5 x 15 mm2), were investigated by SEM (Scanning Electron Microscopy), AFM (Atomic Force Microscopy) and XRD (X-ray Diffractometer). Then, the C-H stretching of synthetic diamond films by FTIR (Fourier Transform Infrared Spectroscopy) was studied. We identified nanocrystalline diamond films on the Al2O3 ceramic substrates. The results showed us that the deposition rate of diamond films was 2.3 microm/h after plasma surface treatments. Comparing the above result with untreated ceramic substrates, the deposition rate improved with the surface roughness of the deposited diamond films.</P>