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Luminescence Properties on Zinc Gallate Affected by Mg and Rare - earth Elements
Ryu, Hojin,Rark, Hee Dong 한국공업화학회 1997 Journal of Industrial and Engineering Chemistry Vol.3 No.3
Zinc gallate (ZnGa₂O₄) phosphor shows promising low voltage properties. Phosphor powders of zinc gallate added with Mg and rare-earth elements were prepared with solid state-reaction method to improve blue luminescent properties. Tm (or Dy), Mg-added zinc gallate phosphor exhibited a strong blue band emission, peaking at about 420㎚, the maximum intensity at the concentration of 0.005 ㏖% Tm and 0.2 ㏖% Mg. It was possible to control luminescent characteristics of zinc gallate by adding various elements.
The crosstalk mechanism of Brassinosteroids and ABA in early seedling development
Hojin Ryu,Wonsil Bae,Ildoo Hwang 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
Seed germination and the establishment of young seedlings are critical phases in the plant’s life cycle. To control these processes, plants have evolved diverse hormonal signaling networks in which brassinosteroids (BRs) attenuate abscisic acid (ABA) responses; however, the underlying regulatory mechanism remains elusive. Here, we reveal that epigenetic silencing of the ABA signaling regulator ABI3 via the BR-related transcription factor BES1 is essential for the inhibitory effect of BRs on ABA signaling during early seedling development. BR-activated BES1 forms a transcriptional repressor complex with TPL via its EAR motif that recruits the histone deacetylase HDA19. This facilitates the histone H3-mediated deacetylation of ABI3 chromatin, leading to the suppression of ABI3 and its downstream target ABI5, which results in reduced ABA sensitivity. We propose that the BR-activated BES1-TPL-HDA19 repressor complex controls epigenetic silencing of ABI3 and thereby suppresses the ABA response during early seedling development.
Hojin Ryu,Wonsil Bae,Hyunsook Kim,Kwangryul Back,Hyunwoo Cho,Ildoo Hwang 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Mitogen-activated protein kinase (MAPK) signaling cascades play critical roles in various cellular events including abiotic/biotic stress responses, innate immunity, hormone signaling and cell specificity in plants. The MAPK-mediated stress and ethylene signaling are recently known to be involved in nitogen-fixing symbiotic interactions; however, the biological role of MAPK for nodule development in legume plants is largely unknown. We here elucidated that MtMKK5-MtMPK3/6 cascade negatively regulate the nitrogen fixing nodule formation in Medicago truncatula. MtMKK5, an ortholog of SIMKK, overexpression significantly reduces the nodule formation in M. truncatula roots. MtMKK5 directly activates MtMPK3/6 by phosphorylation on the TEY motif within the activation loop in the cytoplasm, which might link to EFD as a negative regulator for nodule formation. EFD has a putative MAPK phosphorylation Thr residue and could be a target of the activated MtMPK3/6 in the nucleus. Consistently, a MAPK specific inhibitor U0126 enhances nodule formation and confers similar nodule phenotypes to the efd-1 mutant such as lower proliferation and differentiation to symbiotic tissues. Our works thus reveal a key negative signaling module mediated by MtMKK5-MtMPK3/6-EFD for symbiotic nitrogen fixing nodule organogenesis.
MAP Kinase-Mediated Negative Regulation of Symbiotic Nodule Formation in Medicago truncatula
Ryu, Hojin,Laffont, Carole,Frugier, Florian,Hwang, Ildoo Korean Society for Molecular and Cellular Biology 2017 Molecules and cells Vol.40 No.1
Mitogen-activated protein kinase (MAPK) signaling cascades play critical roles in various cellular events in plants, including stress responses, innate immunity, hormone signaling, and cell specificity. MAPK-mediated stress signaling is also known to negatively regulate nitrogen-fixing symbiotic interactions, but the molecular mechanism of the MAPK signaling cascades underlying the symbiotic nodule development remains largely unknown. We show that the MtMKK5-MtMPK3/6 signaling module negatively regulates the early symbiotic nodule formation, probably upstream of ERN1 (ERF Required for Nodulation 1) and NSP1 (Nod factor Signaling Pathway 1) in Medicago truncatula. The overexpression of MtMKK5 stimulated stress and defense signaling pathways but also reduced nodule formation in M. truncatula roots. Conversely, a MAPK specific inhibitor, U0126, enhanced nodule formation and the expression of an early nodulation marker gene, MtNIN. We found that MtMKK5 directly activates MtMPK3/6 by phosphorylating the TEY motif within the activation loop and that the MtMPK3/6 proteins physically interact with the early nodulation-related transcription factors ERN1 and NSP1. These data suggest that the stress signaling-mediated MtMKK5/MtMPK3/6 module suppresses symbiotic nodule development via the action of early nodulation transcription factors.
Hojin Ryu 한국버섯학회 2016 버섯 Vol.20 No.2
Lentinula edodes, the popular shiitake mushroom, is one of the most important cultivated edible mushrooms. It is used as a food and for medicinal purposes. Here, we present the 46.1 Mb draft genome of L. edodes, comprising 13,028 predicted gene models. The genome assembly consists of 31 scaffolds. Gene annotation provides key information about various signaling pathways and secondary metabolites. This genomic information should help establish the molecular genetic markers for MAS/MAB and increase our understanding of the genome structure and function.