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( Jian Xin Deng ),( Chang Sun Kim ),( Eun Sung Oh ),( Seung Hun Yu ) 한국균학회 2010 Mycobiology Vol.38 No.4
Leaf spot and blight disease was observed on two-year-old seedlings of Dendropanax morbifera (Korean name: Hwangchil tree) during July of 2008 in Jindo Island, Korea. Symptoms included yellow-brown to dark brown irregularly enlarged spots frequently located along the veins of leaves. The lesions were often surrounded by chlorotic haloes. Severe leaf blight and subsequent defoliation occurred when conditions favored disease outbreak. The causal organism of the disease was identified as Alternaria panax based on morphological characteristics and sequence analysis of the internal transcribed spacer region of rDNA. A. panax isolates induced leaf spots and blight symptoms not only on D. morbifera but also on the other members of Araliaceae tested. This is the first report of foliar blight caused by A. panax on D. morbifera.
Occurrence of Leaf Blight on Cosmos Caused by Alternaria cosmosa in Korea
Jian Xin Deng,이지혜,Narayan Chandra Paul,조혜선,Hyang Burm Lee,유승헌 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.1
In 2011, a leaf blight disease was observed on cosmos(Cosmos bipinnatus) leaves in Nonsan, Korea. Thecausal pathogen was isolated and identified based onmorphological and molecular approaches. Morphologicalcharacteristics of the pathogen matched well with theAlternaria cosmosa and also easily distinguishablefrom Alternaria zinniae reported from cosmos seedsby producing branched beak. Phylogenetically, thepathogen could not be distinguished from A. passifloraebased on the sequence analysis of a combined dataset of Alt a1 and gpd genes. However, A. passifloraewas distinguished from the present species by havingconidiophores with 4 to 5 conidiogenous loci. Theresults indicate that the present Alternaria species is A. cosmosa. Pathogenicity tests revealed that the isolatewas pathogenic to the leaves of Cosmos bipinnatus. Thisis the first report of Alternaria blight disease caused byA. cosmosa on cosmos in Korea.
A Novel Alternaria Species Isolated from Peucedanum japonicum in Korea
( Jian Xin Deng ),( Hye Sun Cho ),( Narayan Chandra Paul ),( Hyang Burm Lee ),( Seung Hun Yu ) 한국균학회 2014 Mycobiology Vol.42 No.1
We isolated and examined a new Alternaria sp., which causes leaf spots on Peucedanum japonicum in Korea, by using molecular and morphological methods. Phylogenetic analysis based on a combined internal transcribed spacer region analysis andtwo protein-coding genes(gpd and Alt a1) demonstrated that the causal fungus was most closely related to A. cinerariae and A. sonchi, and relevant to A. brassicae. However, conidial morphology indicated that it is a novel species within the genus Alternaria, and therefore we have assigned the fungus a new name in this study.
Jian Xin Deng,Narayan Chandra Paul,상현규,Ji Hye Lee,황용수,유승헌 한국균학회 2012 Mycobiology Vol.40 No.1
Two species, Penicillium adametzioides and Purpureocillium lilacinum, were isolated from decayed grapes (cv. Cheongsoo) in Korea. Each species was initially identified by phylogenetic analysis of a combined dataset of two genes. Internal transcribed spacer (ITS) and β-tubulin (BT2) genes were used for identification of Penicillium adametzioides, and ITS and partial translation elongation factor 1-α (TEF) genes were used for identification of Purpureocillium lilacinum. Morphologically, they were found to be identical to previous descriptions. The two species presented here have not been previously reported in Korea.
Occurrence of Leaf Blight on Cosmos Caused by Alternaria cosmosa in Korea
Deng, Jian Xin,Lee, Ji Hye,Paul, Narayan Chandra,Cho, Hye Sun,Lee, Hyang Burm,Yu, Seung Hun The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.1
In 2011, a leaf blight disease was observed on cosmos (Cosmos bipinnatus) leaves in Nonsan, Korea. The causal pathogen was isolated and identified based on morphological and molecular approaches. Morphological characteristics of the pathogen matched well with the Alternaria cosmosa and also easily distinguishable from Alternaria zinniae reported from cosmos seeds by producing branched beak. Phylogenetically, the pathogen could not be distinguished from A. passiflorae based on the sequence analysis of a combined data set of Alt a1 and gpd genes. However, A. passiflorae was distinguished from the present species by having conidiophores with 4 to 5 conidiogenous loci. The results indicate that the present Alternaria species is A. cosmosa. Pathogenicity tests revealed that the isolate was pathogenic to the leaves of Cosmos bipinnatus. This is the first report of Alternaria blight disease caused by A. cosmosa on cosmos in Korea.
Alternaria brassicifolii sp. nov. Isolated from Brassica rapa subsp. pekinensis in Korea
( Jian Xin Deng ),( Mei Jia Li ),( Narayan Chandra Paul ),( May Moe Oo ),( Hyang Burm Lee ),( Sang-keun Oh ),( Seung Hun Yu ) 한국균학회 2018 Mycobiology Vol.46 No.2
A new species belonging to the genus Alternaria was isolated from the necrotic leaf spots of Brassica rapa subsp. pekinensis in Yuseong district, Daejeon, Korea. It is an occasional isolate, not an etiological agent, which is morphologically similar to A. broccoli-italicae, but differs in conidial size and conidiophore shape. Phylogenetic analysis using the sequence datasets of the internal transcribed spacer (ITS) region of the rDNA, glyceraldehyde-3-phosphate dehydrogenase (gpd), and plasma membrane ATPase genes showed that it is distantly related to A. broccoli-italicae and closely related to Alternaria species in the section Pseudoalternaria, which belonged to a clade basal to the section Infectoriae. Morphologically, the species is unique because it produces solitary conidia or conidial chains (two units), unlike the four members in the section Pseudoalternaria that produce conidia as short branched chains. It exhibits weak pathogenicity in the host plant. This report includes the description and illustration of A. brassicifolii as a new species.
Research Note: A New Record of Penicillium cainii from Soil in Korea
( Jian Xin Deng ),( Seung Hyun Ji ),( Narayan Chandra Paul ),( Ji Hye Lee ),( Seung Hun Yu ) 한국균학회 2013 Mycobiology Vol.41 No.2
Twenty Penicillium isolates were recovered during the investigation of fungal community in the soil samples collected from Wando (Jeonnam Province, Korea). Among them, one species was identified and described as P. cainii based on phylogentic analysis of internal transcribed spacer and β-tubulin (BT2) genes and morphological characteristics. This is a first report of P. cainii in Korea.
( Jian Xin Deng ),( Narayan Chandra Paul ),( Mei Jia Li ),( Eun Young Seo ),( Gi Ho Sung ),( Seung Hun Yu ) 한국균학회 2011 Mycobiology Vol.39 No.4
Species of Phoma and its allies were isolated during a survey on the diversity of endophytic fungi associated with pine trees in Korea. Based on the phylogenetic analyses of internal transcribed spacer and β-tubulin gene sequences, two Phoma-like species from the needles of Pinus koraiensis were identified as Peyronellaea calorpreferens and P. glomerata. They were also morphologically identified based on the previous descriptions. Here, we report P. calorpreferens and P. glomerata being present in Korea as endophytic fungi in Pinus koraiensis.
Probing the nature of high‐<i>z</i> short GRB 090426 with its early optical and X‐ray afterglows
Xin, Li‐,Ping,Liang, En‐,Wei,Wei, Jian‐,Yan,Zhang, Bing,Lv, Hou‐,Jun,Zheng, Wei‐,Kang,Urata, Yuji,Im, Myungshin,Wang, Jing,Qiu, Yu‐,Lei,Deng, Jin‐,Song,Huang, Blackwell Publishing Ltd 2011 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.410 No.1
<P><B>ABSTRACT</B></P><P>GRB 090426 is a short‐duration burst detected by <I>Swift</I> (<IMG src='/wiley-blackwell_img/equation/MNR_17419_mu1.gif' alt ='inline image'/> s in the observer frame and <IMG src='/wiley-blackwell_img/equation/MNR_17419_mu2.gif' alt ='inline image'/> s in the burst frame at <I>z</I>= 2.609). Its host galaxy properties and some gamma‐ray‐related correlations are analogous to those seen in long‐duration gamma‐ray bursts (GRBs), which are believed to be of a massive star origin (so‐called Type II GRBs). We present the results of its early optical observations with the 0.8‐m Tsinghua University–National Astronomical Observatory of China Telescope (TNT) at Xinglong Observatory and the 1‐m LOAO telescope at Mt Lemmon Optical Astronomy Observatory in Arizona. Our well‐sampled optical afterglow light curve covers from <IMG src='/wiley-blackwell_img/equation/MNR_17419_mu3.gif' alt ='inline image'/> to 10<SUP>4</SUP> s after the GRB trigger. It shows two shallow decay episodes that are likely due to energy injection, which end at <IMG src='/wiley-blackwell_img/equation/MNR_17419_mu4.gif' alt ='inline image'/> and 7100 s, respectively. The decay slopes after the injection phases are consistent with each other (<IMG src='/wiley-blackwell_img/equation/MNR_17419_mu5.gif' alt ='inline image'/>). The X‐ray afterglow light curve appears to trace the optical, although the second energy‐injection phase was missed due to visibility constraints introduced by the <I>Swift</I> orbit. The X‐ray spectral index is <IMG src='/wiley-blackwell_img/equation/MNR_17419_mu6.gif' alt ='inline image'/> without temporal evolution. Its decay slope is consistent with the prediction of the forward shock model. Both X‐ray and optical emission are consistent with being in the same spectral regime above the cooling frequency (<IMG src='/wiley-blackwell_img/equation/MNR_17419_mu7.gif' alt ='inline image'/>). The fact that <IMG src='/wiley-blackwell_img/equation/MNR_17419_mu8.gif' alt ='inline image'/> is below the optical band from the very early epoch of the observation provides a constraint on the burst environment, which is similar to that seen in classical long‐duration GRBs. We therefore suggest that death of a massive star is the possible progenitor of this short burst.</P>