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Lee, Hyun,Park, Myung Soo,Jung, Paul Eunil,Eimes, John A.,Seok, Soon Ja,Lim, Young Woon Mycological Society of Japan 2017 Mycoscience Vol.58 No.5
<P>Russula section Foetentinae is a group of ectomycorrhizal symbiont fungi that are integral in maintaining biodiversity in diverse ecosystems. Identification and accurate classification of these fungi has proven challenging because of significant similarities in morphology, particularly among fruiting bodies. The objective of this study was to re-evaluate the diversity and taxonomy of Russula section Foetentinae in Korea using both phylogenetic analysis and morphological characteristics. A phylogenetic tree was constructed using internal transcribed spacer sequences and compared against key morphological characteristics. Our results reassigned several taxa and established important ecological relationships among closely related species. The phylogenetic analysis produced strong support for seven species, two of which were previously identified, one was a new record to Korea, and one was an undescribed species which we propose to name R. catillus sp. nov. Russula section Foetentinae separated into four clades when molecular and morphological data were combined. An important finding of the study was that several taxonomic assignments based on morphological characters were inconsistent with more reliable molecular data. This study highlights the need for a genetic database that can be easily accessed and used in conjunction with morphological data in order to better resolve the evolutionary history of this important fungal group. (C) 2017 The Mycological Society of Japan. Published by Elsevier B. V. All rights reserved.</P>
Xie, L.,Han, J.H.,Kim, J.J.,Lee, S.Y. Mycological Society of Japan 2016 Mycoscience Vol.57 No.1
<P>Sweet potato whitefly, Bemisia tabaci biotype Q has been recognized as one of the most destructive insect pests worldwide because of increased resistance to some insecticide groups. To develop an alternative control agent, the effects of different culture conditions such as fermentation methods, culture temperatures, initial inoculum concentrations, substrates and medium supplements on the conidial production of the isolate Isaria javanica Pf04 were assessed. The results demonstrated that conidia of the isolate could be economically produced by single-phase solid state fermentation on barley substrate at 25 degrees C with 10(8) conidia/g of initial substrate concentrations. Using optimal conditions, the maximum conidial production obtained was 3.5 x 10(9) conidia/g dry substrate after 15 d of cultivation. The conidia, which were produced on barley alone and barley with 5% additives of silkworm powder and moth larvae, were virulent against second instar nymphs of whitefly, providing >90% mortality. (C) 2015 The Mycological Society of Japan. Published by Elsevier B.V. All rights reserved.</P>
Luo, H.,Wei, X.,Yamamoto, Y.,Liu, Y.,Wang, L.,Sung Jung, J.,Jin Koh, Y.,Hur, J.S. Mycological Society of Japan 2010 Mycoscience Vol.51 No.5
The aim of this study was to evaluate the antioxidant properties of an edible lichen Ramalina conduplicans. The extract exhibited potent anti-linoleic acid peroxidation activity, free radical-scavenging activity, and reducing power. The total phenolic contents were found to be high in the extract. Activity-guided bioautographic thin layer chromatography (TLC) and HPLC identified sekikaic acid and homosekikaic acid as the main free radicalscavenging compounds in R. conduplicans extract (IC<SUB>50</SUB> [50% inhibition concentration] = 0.082 and 0.276mg/ml, respectively). The results suggested that this edible lichen species have the potential to be utilized as food additives or as protective drugs.
Jung, Hae-Yun,Sook Sung, Jae,Mi Whang, Young,Doo Shin, Hyoung,Lae Park, Byung,Suk Kim, Jun,Won Shin, Sang,Yun Seo, Hee,Jung Sung, Hwa,Keun Choi, In,Cheul Oh, Sang,Hong Seo, Jae,Hong Kim, Yeul Mycological Society of Japan 2007 Mycoscience Vol.48 No.4
<P>The fragile histidine triad (FHIT), which was located on chromosome 3p14.2, was currently considered a promising candidate for a tumor suppressor gene. FHIT performed a crucial function in the tumorigenesis of lung cancer. The inactivation of FHIT via genetic alterations, including the chromosomal deletions and aberrant transcription, are often associated with lung cancer. In this study, the association between FHIT and lung cancer development was evaluated in a study of Korean patients. A total of 299 Korean lung cancer patients and 296 control subjects were recruited into this study. Direct DNA sequencing and TaqMan analysis were employed. Logistic regression analyses were conducted in order to characterize the association between FHIT polymorphisms and lung cancer risk. Via direct sequencing in 24 Korean individuals, 27 sequence variants were identified. Eleven of these polymorphisms were selected for a larger scale genotyping (n = 595). Our finding indicated that the polymorphisms and haplotypes in the FHIT gene are not associated with lung cancer in the Korean population.</P>
Isolation and characterization of a non-reducing polyketide synthase gene in Cladonia macilenta
Jeong, M.H.,Kim, J.A.,Yu, N.H.,Jung, J.S.,Hong, S.G.,Cheong, Y.H.,Hur, J.S. Mycological Society of Japan 2015 Mycoscience Vol.56 No.1
Lichens are known to produce various polyketide secondary metabolites. The biosynthesis of these compounds is known to be primarily governed by iterative type I polyketide synthases. A polyketide synthase (PKS) gene, CmaPKS1, from the lichen-forming fungus Cladonia macilenta was isolated and characterized. Mycobionts of C. macilenta showed two morphologically and chemically different types of subcultures. The biruloquinone, an acetylcholinesterase (AChE) inhibitor, was produced by the purple mycobiont, but not the white mycobiont. A Fosmid genomic library was screened using a 495 bp fragment corresponding to part of the β-ketoacyl synthase (KS) domain as a probe for the PKS gene and the results revealed that CmaPKS1 contains KS, acyl transferase (AT), acyl carrier protein (ACP) and thioesterase (TE) domains. Phylogenetic analysis using the translated KS and AT domains demonstrated that CmaPKS1 belongs to the fungal non-reducing PKS clade II. The transcript of CmaPKS1 was more highly expressed in purple than white mycobionts. Furthermore CmaPKS1 gene expression was highly up-regulated in response to UV treatment. These results indicate that CmaPKS1 is a gene probably encoding a functional PKS and may have some functions on lichen secondary metabolites production.
Shrestha, B.,Hyun, M.W.,Oh, J.,Han, J.G.,Lee, T.H.,Cho, J.Y.,Kang, H.,Kim, S.H.,Sung, G.H. Mycological Society of Japan 2014 Mycoscience Vol.55 No.3
A teleomorph of Beauveria sungii S.A. Rehner & Humber is identified as Cordyceps scarabaeicola Y. Kobayasi based on the teleomorphic material of the B. sungii isolate used in the recent phylogenetic study. Cordyceps Fr. 1818 is an older generic name than Beauveria Vuill. 1912 in Cordyceps sensu stricto. Here, C. scarabaeicola is suggested to be adopted for B. sungii on the priority basis of both generic name and species epithet in compliance with the recent revision of Article 59 of the Melbourne Code (recently changed to the 'International Code of Nomenclature for algae, fungi, and plant' or ICN). The pros and cons of a unified nomenclature for pleomorphic fungi are briefly discussed with reference to Beauveria.
Changes in quality of Phellinus gilvus mushroom by different drying methods
Jo, W.S.,Park, S.D.,Park, S.C.,Chang, Z.Q.,Seo, G.S.,Uhm, J.Y.,Jung, H.Y. Mycological Society of Japan 2009 Mycoscience Vol.50 No.1
This study was conducted to investigate the changes in characteristics of the Phellinus gilvus mushroom as influenced by drying methods after harvest. The lowest weight loss rate of P. gilvus mushroom was 75.8% with drying in the shade and 80% by dryer (60<SUP>o</SUP>C). The size loss rate of pileus was 19.3% of that in a hot air dryer (60<SUP>o</SUP>C). The hardness of dried material context using a hot air dryer (60<SUP>o</SUP>C) was the lowest (20kg/cm<SUP>2</SUP>), and that by a dry oven (60<SUP>o</SUP>C) was the highest (457kg/m<SUP>2</SUP>). For ΔE value, 4.9 of context and 2.6 of tubes using drying in the shade (20<SUP>o</SUP>C) were found to be the lowest. The survival rate of sarcoma 180 treated with P. gilvus dried in the sun was the lowest (51.8%), and this was considered the most effective method for antitumor activity against sarcoma 180.
Marasmioid and gymnopoid fungi of the Republic of Korea. 6. Marasmius sect. Marasmius
Antonin, V.,Ryoo, R.,Ka, K.H.,Shin, H.D. Mycological Society of Japan 2014 Mycoscience Vol.55 No.2
Species of Marasmius sect. Marasmius (subsect. Marasmius and Sicciformes) collected in South Korea were studied. The detailed morphological descriptions with figures for five species and a key for the identification are provided. Marasmius wisteriae is described as a new species, and M. bulliardii, M. rotalis, M. tubulatus (all in the subsect. Marasmius), and M. ruforotula (subsect. Sicciformes) are newly recorded in Korea. Their taxonomic position was confirmed by the phylogeny based on the internal transcribed spacer (ITS) and nuclear large ribosomal subunit (LSU) rRNA genes.