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Oo, May Moe,Yoon, Ha-Yeon,Jang, Hyun A,Oh, Sang-Keun The Korean Society of Plant Pathology 2018 Plant Pathology Journal Vol.34 No.6
Bitter rot caused by Colletotrichum species is a common fruit rotting disease of apple and one of the economically important disease in worldwide. In 2015 and 2016, distinct symptoms of bitter rot disease were observed in apple orchards in five regions of South Korea. In the present study, infected apples from these regions were utilized to obtain eighteen isolates of Colletotrichum spp. These isolates were identified and characterized according to their morphological characteristics and nucleotide sequence data of internal transcribed spacer regions and glyceraldehyde-3-phosphate-dehydrogenase. Molecular analyses suggested that the isolates of Colletotrichum causing the bitter rot disease in South Korea belong to 4 species: C. siamense; C. fructicola; C. fioriniae and C. nymphaeae. C. siamense and C. fructicola belonged to Musae Clade of C. gloeosporioides complex species while C. fioriniae and C. nymphaeae belonged to the Clade 3 and Clade 2 of C. acutatum complex species, respectively. Additionally, we also found that the isolates of C. gloeosporioides species-complex were more aggressive than those in the C. acutatum species complex via pathogenicity tests. Taken together, our results suggest that accurate identification of Colletotrichum spp. within each species complex is required for management of bitter rot disease on apple fruit in South Korea.
( May Moe Oo ),( Gitaek Lim ),( Hyun A Jang ),( Sang-keun Oh ) 한국균학회 2017 Mycobiology Vol.45 No.3
The anthracnose disease caused by Colletotrichum species is well-known as a major plant pathogen that primarily causes fruit rot in pepper and reduces its marketability. Thirty-five isolates representing species of Colletotrichum were obtained from chili fruits showing anthracnose disease symptoms in Chungcheongnam-do and Chungcheongbuk-do, South Korea. These 35 isolates were characterized according to morphological characteristics and nucleotide sequence data of internal transcribed spacer, glyceraldehyde-3-phosphate-dehydrogenase, and β-tubulin. The combined dataset shows that all of these 35 isolates were identified as C. scovillei and morphological characteristics were directly correlated with the nucleotide sequence data. Notably, these isolates were recorded for the first time as the causes of anthracnose caused by C. scovillei on pepper in Korea. Forty cultivars were used to investigate the pathogenicity and to identify the possible source of resistance. The result reveals that all of chili cultivars used in this study are susceptible to C. scovillei.
First Report of Anthracnose Caused by Colletotrichum fioriniae on Chinese Matrimony Vine in Korea
( May Moe Oo ),( Solomon Tweneboah ),( Sang-keun Oh ) 한국균학회 2016 Mycobiology Vol.44 No.4
A fungus, Colletotrichum fioriniae, was isolated for the first time from fruits of Chinese matrimony vine (Lycium chinense Mill.) in Korea. It was classified as C. fioriniae based on the morphological characteristics and nucleotide sequence of glyceraldehyde-3-phosphate-dehydrogenase and β-tubulin. To the best of our knowledge, this is the first report of C. fioriniae causing anthracnose of Chinese matrimony vine in Korea.
MAY MOE OO,윤하연,장현아,오상근 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.6
Bitter rot caused by Colletotrichum species is a common fruit rotting disease of apple and one of the economically important disease in worldwide. In 2015 and 2016, distinct symptoms of bitter rot disease were observed in apple orchards in five regions of South Korea. In the present study, infected apples from these regions were utilized to obtain eighteen isolates of Colletotrichum spp. These isolates were identified and characterized according to their morphological characteristics and nucleotide sequence data of internal transcribed spacer regions and glyceraldehyde-3-phosphate-dehydrogenase. Molecular analyses suggested that the isolates of Colletotrichum causing the bitter rot disease in South Korea belong to 4 species: C. siamense; C. fructicola; C. fioriniae and C. nymphaeae. C. siamense and C. fructicola belonged to Musae Clade of C. gloeosporioides complex species while C. fioriniae and C. nymphaeae belonged to the Clade 3 and Clade 2 of C. acutatum complex species, respectively. Additionally, we also found that the isolates of C. gloeosporioides species-complex were more aggressive than those in the C. acutatum species complex via pathogenicity tests. Taken together, our results suggest that accurate identification of Colletotrichum spp. within each species complex is required for management of bitter rot disease on apple fruit in South Korea.
( May Moe Oo ),( Sang-keun Oh ) 한국균학회 2017 Mycobiology Vol.45 No.4
In 2016, grape fruits showing ripe rot symptom were found in fields of Korea. The fungus was isolated and identified as Colletotrichum viniferum based on morphological characteristics and nucleotide sequence data of the internal transcribed spacer, glyceraldehyde-3-phosphate dehydrogenase and β-tubulin. To our knowledge, this is the first report of C. viniferum causing grape ripe rot disease of grape fruits in Korea.
New Record of Anthracnose Caused by Colletotrichum liriopes on Broadleaf Liriope in Korea
Oo, May Moe,Oh, Sang-Keun The Korean Society of Mycology 2017 韓國菌學會誌 Vol.45 No.1
In 2015, the leaves of broadleaf liriope, Liriope muscari, showing anthracnose symptoms were found in a field of Korea. The fungus was isolated and identified as Colletotrichum liriopes based on the morphological characteristics and nucleotide sequence data of the glyceraldehyde-3-phosphate dehydrogenase, internal transcribed spacer and actin genes. To the best of our knowledge, this is the first report of C. liriopes isolated from L. muscari in Korea.
송정영,MAY MOE OO,박수연,서문원,이성찬,전낙범,남명현,이윤수,김홍기,오상근 충남대학교 농업과학연구소 2018 Korean Journal of Agricultural Science Vol.45 No.4
Bacterial fruit blotch (BFB) caused by Acidovorax citrulli is a devastating disease found in many cucurbits cultivation fields. The genetic diversity for 29 strains of A. citrulli collected from various cucurbits in South Korea was determined by DNA fingerprinting with a pathogenicity test, multi locus analysis, Rep-PCR (repetitive sequence polymerase chain reaction), and URP (universal rice primers) PCR bands. Two distinct groups (Korean Clonal Complex, KCC1 and KCC2) in the population were identified based on group specific genetic variation in the multi locus phylogeny using six conserved loci and showed a very high similarity with DNA sequences for representative foreign groups [the group I (CC1-1 type) and the group II (CC2-5 type)] widely distributed worldwide, respectively. Additionally, in the case of phaC, a new genotype was found within each Korean group. The KCC1 was more heterogeneous compared to the KCC2. The KCC1 recovered mainly from melons and watermelons (ratio of 6 : 3) and 15 of the 20 KCC2 strains recovered from watermelons were dominant in the pathogen population. Accordingly, this study found that two distinct groups of differentiated A. citrulli exist in South Korea, genetically very similar to representative foreign groups, with a new genotype in each group resulting in their genetic diversity.
Hyun A Jang,May Moe Oo,Dae-Gyu Kim,Ha-Yeon Yoon,Mi-Reu Kim,Kyo-Sang Lee,Khaing Shwe Zin Thinn,Saima Arif,Jia Guo Geng,Ji-Young Min,Dong Jun Lim,허윤영,오상근 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5
Grape ripe rot is a fungal disease, which is almost inextinguishable particularly before and after harvest in most vineyards. The management of this disease largely depends on the breeding of resistant varieties. Thus, the search for resistant varietiesshould parallel the molecular analysis of the markers associated with disease resistance. Here, we tested the leaf inoculationassay of Colletotrichum acutatum and C. gloeosporioides by inoculating them into 350 grapevine varieties. As a resultof the phenotypes common to both species, 119 varieties (34%) were classifi ed as resistant. Consequently, we discoveredthe locus with nucleotide-binding sites and carboxyterminal leucine-rich repeat regions ( NBS-LRR ) associated with graperipe rot resistance through genotyping-by-sequencing and genome-wide association study. Ultimately, we identifi ed theVitis vinifera Colletotrichum resistance protein ( VvCRP ) markers from chromosome 3, which belongs to the CC-NBS-LRRtype, as disease-resistant proteins. These markers were verifi ed as the melting peak, and their chromatograms of nucleotidesequences were visualized in each single nucleotide polymorphism (SNP) loci. All the SNP markers diff erentiated successfullythe resistant from the susceptible cultivars. Interestingly, we also found that a resistant cultivar named Bailey AlicanteA has a heterozygous genotype, substantiating its potential usefulness for crops such as grapevine with many hybrids. Altogether,our results indicate that VvCRP markers can be utilized to distinguish grape ripe rot-resistant cultivars, particularlyin crossbreeding populations.
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.