A5072961887- Photosynthetic Processes and Mechanisms
- Algal biology and biofuel production
- Light effects on plants
- Plant Molecular Biology Research
- Photoreceptor and optogenetics research
- Plant Stress Responses and Tolerance
- Plant nutrient uptake and metabolism
- Biocrusts and Microbial Ecology
- Plant Gene Expression Analysis
- Plant tissue culture and regeneration
- Plant Reproductive Biology
- Mitochondrial Function and Pathology
- Marine and coastal ecosystems
- Plant biochemistry and biosynthesis
- Plant Genetic and Mutation Studies
- Protist diversity and phylogeny
- Plant Virus Research Studies
- Spectroscopy and Quantum Chemical Studies
- Microbial Metabolic Engineering and Bioproduction
- Transgenic Plants and Applications
- Legume Nitrogen Fixing Symbiosis
- Viral Infectious Diseases and Gene Expression in Insects
- Plant-Microbe Interactions and Immunity
- Enzyme function and inhibition
- Plant Parasitism and Resistance
Chungnam National University
2016-2025
Simon Fraser University
2025
Kongju National University
2013-2018
University of Minnesota
2011-2013
Kyung Hee University
2008-2011
CHA University
2011
Korea Research Institute of Standards and Science
2010
Korea Research Institute of Bioscience and Biotechnology
2007
Myongji University
2007
Western University
2006
Abstract Loss of green color in leaves results from chlorophyll (Chl) degradation chloroplasts, but little is known about how Chl catabolism regulated throughout leaf development. Using the staygreen (sgr) mutant rice (Oryza sativa), which maintains greenness during senescence, we identified Sgr, a senescence-associated gene encoding novel chloroplast protein. Transgenic overexpressing Sgr produces yellowish-brown leaves, and Arabidopsis thaliana pheophorbide oxygenase–impaired mutants...
Several positive transcription factors regulate Arabidopsis anthocyanin biosynthesis. HY5, a component of light‐signaling pathways, and PAP1, an R2R3‐MYB factor, share common regulatory targets on biosynthesis genes. The epistatic interactions between the two are currently unknown. To address this problem, we analyzed crosses hy5 pap1 mutants ( hy5pap1 ) or pap1D overexpressors hy5pap1D ), performed chromatin immunoprecipitation‐qPCR, determined PAP1 promoter region through deletion...
Abstract Anthocyanin accumulation is regulated negatively by ethylene signaling and positively sugar light signaling. However, the antagonistic interactions underlying these signalings remain to be elucidated fully. We show that inhibits anthocyanin induced sucrose (Suc) suppressing expression of transcription factors regulate biosynthesis, including GLABRA3, TRANSPARENT TESTA8, PRODUCTION OF ANTHOCYANIN PIGMENT1, while stimulating concomitant negative R3-MYB regulator MYBL2. Genetic...
Abstract Phytochrome B (phyB) is a plant photoreceptor that forms membraneless organelle called photobody. However, its constituents are not fully known. Here, we isolated phyB photobodies from Arabidopsis leaves using fluorescence-activated particle sorting and analyzed their components. We found photobody comprises ~1,500 dimers along with other proteins could be classified into two groups: The first includes directly interact localize to the when expressed in protoplasts, while second...
Physiological functions of sucrose (Suc) transporters (SUTs) localized to the tonoplast in higher plants are poorly understood. We here report isolation and characterization a mutation rice (Oryza sativa) OsSUT2 gene. Expression OsSUT2-green fluorescent protein revealed that localizes tonoplast. Analysis promoter::β-glucuronidase transgenic indicated this gene is highly expressed leaf mesophyll cells, emerging lateral roots, pedicels fertilized spikelets, cross cell layers seed coats....
Abstract The Arabidopsis (Arabidopsis thaliana) hexokinase 1 (AtHXK1) is recognized as an important glucose (Glc) sensor. However, the function of hexokinases Glc sensors has not been clearly demonstrated in other plant species, including rice (Oryza sativa). To investigate functions isoforms, we characterized OsHXK5 and OsHXK6, which are evolutionarily related to AtHXK1. Transient expression analyses using GFP fusion constructs revealed that OsHXK6 associated with mitochondria....
Abstract Vascular plants develop distinctive root hair distribution patterns in the epidermis, depending on taxon. The three patterns, random (Type 1), asymmetrical cell division 2), and positionally cued 3), are controlled by different upstream fate-determining factors that mediate expression of cell-specific genes for morphogenesis. Here, we address whether these possess a common transcriptional regulatory module (cis-element) determining cell-type specificity despite differences final...
Positive phototaxis systems have been well studied in bacteria; however, the photoreceptor(s) and their downstream signaling components that are responsible for negative poorly understood. Negative sensory important cyanobacteria, oxygenic photosynthetic organisms must contend with reactive oxygen species generated by an abundance of pigment photosensitizers. The unicellular cyanobacterium Synechocystis sp. PCC6803 exhibits type IV pilus-dependent response to unidirectional UV-A...
Summary Panax ginseng C. A. Meyer, reputed as the king of medicinal herbs, has slow growth, long generation time, low seed production and complicated genome structure that hamper its study. Here, we unveil genomic architecture tetraploid P. by de novo assembly, representing 2.98 Gbp with 59 352 annotated genes. Resequencing data indicated diploid species diverged in association global warming Southern Asia, two North American evolved via intercontinental migrations. Two whole duplications (...
• In higher plants, the plastidic glucose translocator (pGlcT) is assumed to play a role in export of starch degradation products, but this has not yet been studied detail. To elucidate pGlcT leaves Arabidopsis thaliana, we generated single and double mutants lacking three sugar transporters, pGlcT, triose-phosphate/phosphate (TPT), maltose transporter (MEX1), analyzed their growth phenotypes, photosynthetic properties metabolite contents. contrast pglct-1 pglct-2 visible phenotype,...
The role of high-light-induced chloroplast movement in the photoprotection facultative shade plant Tradescantia albiflora was investigated by comparison with pea (Pisum sativum L.) leaves, both grown 50 [mu]mol photons m-2 s-1. Photoinactivation photosystem II (PSII) vivo induced 1.1% CO2 varying either duration (0-2 h) illumination (fixed at 1800 s-1) or irradiance (0-3000 a fixed (1 after infiltration leaves water lincomycin (an inhibitor chloroplast-encoded protein synthesis). At all...
Pumilio, an RNA-binding protein that contains tandemly repeated Puf domains, is known to repress translational activity in early embryogenesis and polarized cells of non-plant species. Although Pumilio proteins have been characterized many eukaryotes, their role plants unknown. In the present study, we Arabidopsis Pumilio-encoding gene, APUM23. APUM23 constitutively expressed, with higher levels metabolically active tissues, its expression up-regulated presence either glucose or sucrose. The...
Serotonin N-acetyltransferase (SNAT) catalyzes conversion of serotonin into N-acetylserotonin, which is a direct precursor for melatonin biosynthesis in all organisms. Molecular cloning plant SNAT from rice led to screening homolog genes other species. We identified cyanobacterium SNAT-like gene (cSNAT) that showed 56% amino acid homology with the SNAT. To confirm whether cSNAT encoded enzyme activity, we expressed DNA Escherichia coli and purified protein as C-terminal His-tagged form. The...
Despite the importance of pentatricopeptide repeat (PPR) proteins in organellar RNA metabolism and plant development, functions many PPR remain unknown. Here, we determined role a mitochondrial protein (At1g52620) comprising 19 motifs, thus named PPR19, Arabidopsis thaliana. The ppr19 mutant displayed abnormal seed reduced yield, delayed germination, retarded growth, indicating that PPR19 is indispensable for normal growth development Splicing pattern analysis genes revealed specifically...
Summary Skin hyperpigmentation is caused by the overproduction of melanin pigment, which synthesized action tyrosinase. We recently reported that aloesin inhibits tyrosinase activity. The present study was undertaken to test inhibitory effect on pigmentation in human skin after UV radiation. Experimental subjects were UV‐irradiated (210 mJ) inner forearm. regions assigned four groups: vehicle control, treated, arbutin and treated. Aloesin and/or administered times a day for 15 days....
Iron deficiency is known to suppress primary productivity in both marine and freshwater ecosystems. In response iron deficiency, certain cyanobacteria induce a chlorophyll (Chl)–protein complex, CP43′, which encoded by the isiA gene. The deduced amino‐acid sequence of CP43′ predicts some structural similarity CP43 polypeptide photosystem II, but function remains uncertain. order assess its physiological role, gene cyanobacterium, Synechococcus sp. PCC7942, was inactivated insertion...