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노성우,Rira Seo,박중권,Md. Maniruzzaman Manir,박경석,상미경,문석식,정호원 한국식물병리학회 2017 Plant Pathology Journal Vol.33 No.4
Cyclic dipeptides (CDPs) are one of the simplest compounds produced by living organisms. Plant-growth promoting rhizobacteria (PGPRs) also produce CDPs that can induce disease resistance. Bacillus vallismortis strain BS07 producing various CDPs has been evaluated as a potential biocontrol agent against multiple plant pathogens in chili pepper. However, plant signal pathway triggered by CDPs has not been fully elucidated yet. Here we introduce four CDPs, cyclo(Gly- L-Pro) previously identified from Aspergillus sp., and cyclo(L-Ala-L-Ile), cyclo(L-Ala-L-Leu), and cyclo(LLeu- L-Pro) identified from B. vallismortis BS07, which induce disease resistance in Arabidopsis against Pseudomonas syringae infection. The CDPs do not directly inhibit fungal and oomycete growth in vitro. These CDPs require PHYTOALEXIN DEFICIENT4, SALICYLIC ACID INDUCTION DEFICIENT2, and NONEXPRESSOR OF PATHOGENESIS-RELATED PROTEINS1 important for salicylic acid-dependent defense to induce resistance. On the other hand, regulators involved in jasmonate-dependent event, such as ETHYLENE RECEPTOR1, JASMONATE RESPONSE1, and JASMONATE INSENSITIVE1, are necessary to the CDP-induced resistance. Furthermore, treatment of these CDPs primes Arabidopsis plants to rapidly express PATHOGENESIS-RELATED PROTEIN4 at early infection phase. Taken together, we propose that these CDPs from PGPR strains accelerate activation of jasmonate-related signaling pathway during infection.
Yeo, Jun-Seok,Kang, Rira,Lee, Sehyun,Jeon, Ye-Jin,Myoung, NoSoung,Lee, Chang-Lyoul,Kim, Dong-Yu,Yun, Jin-Mun,Seo, You-Hyun,Kim, Seok-Soon,Na, Seok-In Elsevier 2015 Nano energy Vol.12 No.-
<P><B>Abstract</B></P> <P>We demonstrate a simple solution and room-temperature processed reduced graphene oxide (RGO) as a novel hole-transporting material (HTM) to guarantee highly efficient and highly stable CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cells (PeSCs). The effects of RGO HTM are systemically investigated in terms of PeSC efficiency, PeSC stability, morphology of perovskite film, recombination dynamics, and charge-transport through CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>/HTM interface. The resultant PeSC with a planar configuration of glass/ITO/RGO/CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>/PC<SUB>61</SUB>BM/bathocuproine (BCP)/Ag exhibits improved device efficiency (maximum PCE of 10.8%) with high reproducibility than those of the reference devices using conventional PEDOT:PSS and GO HTMs. Also, the RGO-based PeSCs show highly desirable device stability in comparison to the PEDOT:PSS PeSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly efficient and stable perovskite solar cells are developed using solution and room-temperature processed RGO. </LI> <LI> The resultant PeSC with planar architecture depicts a superior device efficiency (10.8%) to PEDOT:PSS- and GO-based solar cells. </LI> <LI> The use of RGO HTMs with the inherent passivation ability greatly extended the cell-operation time compared to PeSCs with PEDOT:PSS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Min Woo,Seo, Rira,Lee, Yu Jeong,Bae, Ju Hye,Park, Jung-Kwon,Yoon, Joung-Hahn,Lee, Jei Wan,Jung, Ho Won Elsevier 2016 Biochemical and biophysical research communication Vol.480 No.3
<P><B>Abstract</B></P> <P>An <I>Arabidopsis thaliana ALTERED MERISTEM PROGRAM1</I> (<I>AtAMP1</I>), which encodes a putative glutamate carboxypeptidase, not only controls shoot apical meristem development, but also is involved in tolerance response to abiotic stresses. Here, we introduce a novel mutant; named <I>amp1-32</I> that is a phenocopier to previously isolated different <I>amp1</I> mutant alleles. Interestingly, tiny leaves were continuously developed at the bottom of pre-emerged leaves in the <I>amp1-32</I>. The <I>amp1-32</I> mutant was less sensitive to heat shock treatment lasting for 3 h, whereas disease symptoms were severely developed in the mutant after <I>Pseudomonas syringae</I> infection. The mRNA levels of 171 genes were significantly altered in the mutant, as compared to wild-type plants. The transcription of genes involved in hormone signaling, post-embryonic development, and shoot development were up-regulated in the <I>amp1-32</I> mutant, whereas expression of genes related to responsiveness to pathogens and (in)organic matters, were decreased in the mutant. Taken together, perturbation of CK- and ABA-related events by AMP1 mutation caused aberrant development phenotype and conflicting responses against abiotic and biotic stresses in <I>Arabidopsis</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel amp1-32 mutant shows aberrant growth and development phenotypes. </LI> <LI> The amp1-32 mutant tolerates heat treatment, but shows severe symptom development after <I>P. syringae</I> infection. </LI> <LI> Mutation of the AMP1 causes transcriptional reprogramming in Arabidopsis. </LI> </UL> </P>