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Functional Implication of β-Carotene Hydroxylases in Soybean Nodulation
Kim, Yun-Kyoung,Kim, Sunghan,Um, Ji-Hyun,Kim, Kyunga,Choi, Sun-Kang,Um, Byung-Hun,Kang, Suk-Woo,Kim, Jee-Woong,Takaichi, Shinichi,Song, Seok-Bo,Lee, Choon-Hwan,Kim, Ho-Seung,Kim, Ki Woo,Nam, Kyoung He American Society of Plant Biologists 2013 PLANT PHYSIOLOGY - Vol.162 No.3
<P><I>Carotenoids are essential for nodule development in soybean.</I></P>
Functional implication of β-carotene hydroxylases in soybean nodulation
Sunghan Kim,Youn-Kyung Kim,Hee-Jong Koh,Choong-Ill Cheon 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
β-carotene hydroxylase (BCH) has been implicated as a key enzyme conferring a stress tolerant mechanism in plants by production of carotenoids, which serve as protectants against photoinhibition and precursor of ABA biosynthesis. We previously cloned a gene encoding a novel cytosolic form of BCH (GmBCH1) from soybean (Glycine max) whose expression increased during nodulation with Bradyrhizobium japonicum. In the present work we extended our study to three GmBCHs as soybean is an allotetraploid, and examined their possible role(s) in nodule development. In situ hybridization revealed the expression of three GmBCHs (GmBCH1, GmBCH2, and GmBCH3) in the infected cells of root nodules, and their enzymatic activities were confirmed by functional assays in E. coli. Localization of GmBCHs by transfecting Arabidopsis protoplasts with GFP fusions and by EM immunogold detection in soybean nodules indicated that GmBCH2 and GmBCH3 were present in plastids while GmBCH1 appeared to be cytosolic. RNAi of the GmBCHs severely impaired nitrogen fixation as well as nodule development. Surprisingly, we failed to detect zeaxanthin, a product of GmBCH, or any other carotenoids, in nodules. We therefore examined the possibility that most of the carotenoids in nodules are converted or cleaved to other compounds. We detected the expression of some carotenoid cleavage dioxygenases (GmCCDs) in wild-type nodules, and also a reduced amount of zeaxanthin in GmCCD8-expressing E. coli, suggesting cleavage of the carotenoid. In view of these findings we propose that carotenoids such as zeaxanthin synthesized in root nodules are cleaved by GmCCDs, and we discuss the possible roles of the carotenoid cleavage products in nodulation.
Sunghan Kim,Hee-Jong Koh 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
In order to cope with the recent global warming and climate change that is projected to have a grave impact on agriculture worldwide, we will direct our focus on developing crops tolerant to multiple abiotic stresses including drought, cold and heat, with the following research activities conducted by three different research groups including an international research team at IRRI. 1) Development of heat/cold tolerant rice variety : Major genes conferring heat tolerance and cold resistance in rice will be identified by comparative transcriptome analyses and new molecular markers will be developed based upon these data. EMS mutagenesis and proteomics analyses will accompany this approach to supplement this gene identification and marker development efforts. Once reliable markers are obtained in this way, new varieties of heat/cold tolerant japonica rice will be bred through introgression of these genes. 2) Development of drought/heat tolerant rice variety : Through QTL mapping conducted on RILs between a drought resistant line and an elite line, genes conferring drought/heat tolerance will be identified and molecular markers will be developed using SNP/GBS genotyping methods. Using these markers, new rice varietis with drought/heat tolerance will be bred by employing marker assisted selection (MAS) as well as marker assisted backcross (MABC). 3) Identification of genes involved in multiple stress responses in ginseng and brassica : Molecular breeding of stress tolerance traits in ginseng and brassica is not well established to date. Taking advantage of the ginseng whole genome sequence data information and other comparative genomics approaches, members of the stress-response transcription factor family CBF/DREB will be identified and their functional analyses will be performed in ginseng and brassica using transcriptome profiling of both wild type and transgenic plants including the adventitious root-derived transgenic ginseng. Major Publications: - Lee, J., W. Jiang, et al. (2011). “Shotgun proteomic analysis for detecting differentially expressed proteins in the reduced culm number rice.” Proteomics 11(3): 455-468. - Ji, H., S. R. Kim, et al. (2010). “Inactivation of the CTD phosphatase-like gene OsCPL1 enhances the development of the abscission layer and seed shattering in rice.” The Plant journal 61(1): 96-106. - Chin JH, Gamuyao R, Dalid C, Bustamam M, Prasetiyono J, Moeljopawiro S, Wissuwa M, Heuer S (2011) Developing rice with high yield under P-deficiency: Pup1 sequence and application. Plant Physiology 156: 1-15. - Hong-Il Choi, Nam Hoon Kim et al. (2011) Development of Reproducible EST-derived SSR Markers and their application for genomics and breeding of Panax ginseng Journal of Ginseng Research 35(4): 399-412.
넓은 온도 범위에서 고정 구동전류로 동작하는 1.25 Gbps 850 ㎚ 산화형 VCSEL 송신기의 특성
김태기(Taeki Kim),김태용(Taeyong Kim),김상배(Sang-Bae Kim),김성한(Sunghan Kim) 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.12
넓은 온도 범위에서 고정된 구동 전류로 동작하는 VCSEL(Vertical-Cavity Surface-Emitting Laser) 송신기의 저전류 동작 특성을 살펴보았다. 사용된 VCSEL은 산화형 850 ㎚ 레이저로, d²Ith/dT²값이 약 1.346×10?⁴ mA/℃² 으로 문턱전류의 온도의 존성이 비교적 낮은 것이었으며, 데이터 속도는 1.25 Gbps였다. 칩 상태에서의 광출력-전류-전압을 측정하여 20℃에서의 광출력이 1 mW가 되는 전류를 on 전류로 설정한 후 -20℃에서 80℃의 온도 범위에서 20℃ 간격으로 온도를 바꾸어가며 off 전류의 변화에 따른 turn-on 특성, turn-off 특성 그리고 eye-diagram을 관찰하였고 온도와 off 전류에 따라 eye-diagram에서 rise time, fall time, extinction ratio, timing jitter가 어떻게 변화하는지를 살펴보았다. 그 결과 최소 문턱전류보다 약 0.1~0.2mA 정도 낮게 off 전류를 설정하면 20℃에서 80℃의 온도 범위에서 off 전류와 on 전류를 변화시키지 않고 1.25 Gbps에서 송신기로 동작 시킬 수 있음을 확인하였다. We have analyzed low current operation characteristics of a VCSEL transmitter operating at fixed current over wide temperature range. Used 850 nm oxide VCSEL has low temperature dependence of the threshold current and d²Ith/dT² is approximately 1.346×10?⁴ mA/℃². We fixed on-current so that output power from the chip is 1 mW at 20℃ and investigated the turn-on, turn-off characteristics and eye-diagram of the 850 nm oxide VCSEL transmitter with varying ambient temperature and off-current. We measured rise time, fall time, extinction ratio and timing jitter by changing the ambient temperature and off-current. With the fixed off-current of around 0.1~0.2 mA lower than the lowest threshold current the transmitter successfully operated at 1.25 Gbps over a wide temperature range from 20℃ to 80℃.
Middle East Respiratory Syndrome in 3 Persons, South Korea, 2015
Yang, Jeong-Sun,Park, SungHan,Kim, You-Jin,Kang, Hae Ji,Kim, Hak,Han, Young Woo,Lee, Han Saem,Kim, Dae-Won,Kim, A-Reum,Heo, Deok Rim,Kim, Joo Ae,Kim, Su Jin,Nam, Jeong-Gu,Jung, Hee-Dong,Cheong, Hyang- U.S. Department of Health and Human Services * Cen 2015 Emerging Infectious Diseases Vol.21 No.11
<P>In May 2015, Middle East respiratory syndrome coronavirus infection was laboratory confirmed in South Korea. Patients were a man who had visited the Middle East, his wife, and a man who shared a hospital room with the index patient. Rapid laboratory confirmation will facilitate subsequent prevention and control for imported cases.</P>