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Jung, Boknam,Park, Jungwook,Son, Hokyoung,Lee, Yin-Won,Seo, Young-Su,Lee, Jungkwan The Korean Society of Plant Pathology 2014 Plant Pathology Journal Vol.30 No.3
The plant pathogen Fusarium graminearum causes Fusarium head blight in cereal crops and produces mycotoxins that are harmful to animals and humans. For the initiation and spread of disease, asexual and sexual reproduction is required. Therefore, studies on fungal reproduction contribute to the development of new methods to control and maintain the fungal population. Screening a previously generated transcription factor mutant collection, we identified one putative $C_2H_2$ zincfinger transcription factor, pcs1, which is required for both sexual and asexual reproduction. Deleting pcs1 in F. graminearum resulted in a dramatic reduction in conidial production and a complete loss of sexual reproduction. The pathways and gene ontology of pcs1-dependent genes from microarray experiments showed that several G-protein related pathways, oxidase activity, ribosome biogenesis, and RNA binding and processing were highly enriched, suggesting that pcs1 is involved in several different biological processes. Further, overexpression of pcs1 increased conidial production and resulted in earlier maturation of ascospores compared to the wild-type strain. Additionally, the vegetative growth of the overexpression mutants was decreased in nutrient-rich conditions but was not different from the wild-type strain in nutrient-poor conditions. Overall, we discovered that the pcs1 transcription factor positively regulates both conidiation and sexual reproduction and confers nutrient condition-dependent vegetative growth.
Jung, Boknam,Lee, Sehee,Ha, Jiran,Park, Jong-Chul,Han, Sung-Sook,Hwang, Ingyu,Lee, Yin-Won,Lee, Jungkwan The Korean Society of Plant Pathology 2013 Plant Pathology Journal Vol.29 No.4
The ascomycete fungus Fusarium graminearum is a major causal agent for Fusarium head blight in cereals and produces mycotoxins such as trichothecenes and zearalenone. Isolation of the fungal strains from air or cereals can be hampered by various other airborne fungal pathogens and saprophytic fungi. In this study, we developed a selective medium specific to F. graminearum using toxoflavin produced by the bacterial pathogen Burkholderia glumae. F. graminearum was resistant to toxoflavin, while other fungi were sensitive to this toxin. Supplementing toxoflavin into medium enhanced the isolation of F. graminearum from rice grains by suppressing the growth of saprophytic fungal species. In addition, a medium with or without toxoflavin exposed to wheat fields for 1 h had 84% or 25%, respectively, of colonies identified as F. graminearum. This selection medium provides an efficient tool for isolating F. graminearum, and can be adopted by research groups working on genetics and disease forecasting.
Efficacy of Diphenyleneiodonium Chloride (DPIC) Against Diverse Plant Pathogens
( Boknam Jung ),( Taiying Li ),( Sungyeon Ji ),( Jungkwan Lee ) 한국균학회 2019 Mycobiology Vol.47 No.1
Many of the fungicides and antibiotics currently available against plant pathogens are of limited use due to the emergence of resistant strains. In this study, we examined the effects of diphenyleneiodonium chloride (DPIC), an inhibitor of the superoxide producing enzyme NADPH oxidase, against fungal and bacterial plant pathogens. We found that DPIC inhibits fungal spore germination and bacterial cell proliferation. In addition, we demonstrated the potent antibacterial activity of DPIC using rice heads infected with the bacterial pathogen Burkholderia glumae which causes bacterial panicle blight (BPB). We found that treatment with DPIC reduced BPB when applied during the initial flowering stage of the rice heads. These results suggest that DPIC could serve as a new and useful antimicrobial agent in agriculture.
Jung, Boknam,Park, Sook-Young,Lee, Yin-Won,Lee, Jungkwan The Korean Society of Plant Pathology 2013 Plant Pathology Journal Vol.29 No.1
Fusarium head blight (FHB) caused by the filamentous fungus Fusarium graminearum is one of the most severe diseases threatening the production of small grains. Infected grains are often contaminated with mycotoxins such as zearalenone and trichothecences. During survey of contamination by FHB in rice grains, we found a bacterial isolate, designated as BN1, antagonistic to F. graminearum. The strain BN1 had branching vegetative hyphae and spores, and its aerial hyphae often had long, straight filaments bearing spores. The 16S rRNA gene of BN1 had 100% sequence identity with those found in several Streptomyces species. Phylogenetic analysis of ITS regions showed that BN1 grouped with S. sampsonii with 77% bootstrap value, suggesting that BN1 was not a known Streptomyces species. In addition, the efficacy of the BN1 strain against F. graminearum strains was tested both in vitro and in vivo. Wheat seedling length was significantly decreased by F. graminearum infection. However, this effect was mitigated when wheat seeds were treated with BN1 spore suspension prior to F. graminearum infection. BN1 also significantly decreased FHB severity when it was sprayed onto wheat heads, whereas BN1 was not effective when wheat heads were point inoculated. These results suggest that spraying of BN1 spores onto wheat heads during the wheat flowering season can be efficient for plant protection. Mechanistic studies on the antagonistic effect of BN1 against F. graminearum remain to be analyzed.
Investigation of phase separated polyimide blend films containing boron nitride using FTIR imaging
Chae, Boknam,Hong, Deok Gi,Jung, Young Mee,Won, Jong Chan,Lee, Seung Woo Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.195 No.-
<P><B>Abstract</B></P> <P>Immiscible aromatic polyimide (PI) blend films and a PI blend film incorporated with thermally conductive boron nitride (BN) were prepared, and their phase separation behaviors were examined by optical microscopy and FTIR imaging. The 2,2′-bis(trifluoromethyl)benzidine (TFMB)-containing and 4,4′-thiodianiline (TDA)-containing aromatic PI blend films and a PI blend/BN composite film show two clearly separated regions; one region is the TFMB-rich phase, and the other region is the TDA-rich phase. The introduction of BN induces morphological changes in the immiscible aromatic PI blend film without altering the composition of either domain. In particular, the BN is selectively incorporated into the TDA-rich phase in this study.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phase separation behaviors of a PI blend film containing BN were investigated by FTIR imaging. </LI> <LI> The TFMB- and TDA-containing aromatic PI blend films and a PI blend/BN composite film show the clearly separated regions. </LI> <LI> Introduction of BN induces morphological changes in the PI blend film without altering the composition of either domain. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chae, Boknam,Seo, Ji Hun,Moon, Kwan Ho,Jung, Young Mee,Lee, Seung Woo Elsevier 2018 Journal of molecular structure Vol.1167 No.-
<P><B>Abstract</B></P> <P>Two-dimensional (2D) correlation analysis of <I>in situ</I> FTIR spectra was used to probe the thermally induced structural changes in a poly(hydroxyamide) (PHA) precursor prepared from the reaction of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (Bis-AP-AF) with terephthaloyl chloride. Large spectral changes in the <I>in situ</I> FTIR spectra of the PHA precursor film were observed in the range of 200–300 °C. The thermal cyclodehydration reaction of the PHA precursor film strongly affects the spectral changes corresponding to the amide group and the adjacent phenyl ring in the Bis-AP-AF unit. The thermal cyclodehydration reaction of the PHA precursor film in the range of 240–300 °C induced the spectral changes in amide linkage before the formation of the benzoxazole ring.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Investigation of the structural evolution of a PHA precursor to PBO using <I>in situ</I> FTIR spectroscopy. </LI> <LI> 2Dcorrelation analysis of structural changes in the PHA precursor with increasing temperature. </LI> <LI> Thermal cyclization of PHA. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>