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Plant Pathology Journal

Hae-Ryun Kwak, Jaedeok Kim, Mikyeong Kim, Jang-Kyun Seo, Jeong-Soo Kim, Hong-Soo Choi
The Sweet potato chlorotic fleck virus (SPCFV), of the genus Carlavirus (family Betaflexiviridae), was first detected as one of several viruses infecting sweet potatoes ( Ipomea batatas L.) in Korea. Out of 154 sweet potato samples collected in 2012 that were showing virus-like symptoms, 47 (31%) were infected with SPCFV, along with other viruses. The complete genome sequences of four SPCFV isolates were determined and analyzed using previously reported genome sequences. The complete genomes were found to contain 9,104-9,108 nucleotides, excluding the poly-A tail, containing six putative open reading frames (ORFs)...
October 2018: Plant Pathology Journal
Jungkum Park, Gyu Min Lee, Donghyuk Kim, Duck Hwan Park, Chang-Sik Oh
Bacteriophages, bacteria-infecting viruses, have been recently reconsidered as a biological control tool for preventing bacterial pathogens. Erwinia amylovora and E. pyrifoliae cause fire blight and black shoot blight disease in apple and pear, respectively. In this study, the bacteriophage phiEaP-8 was isolated from apple orchard soil and could efficiently and specifically kill both E. amylovora and E. pyrifoliae . This bacteriophage belongs to the Podoviridae family. Whole genome analysis revealed that phiEaP-8 carries a 75,929 bp genomic DNA with 78 coding sequences and 5 tRNA genes...
October 2018: Plant Pathology Journal
Won-Hee Kang, Seon-In Yeom
Receptor-like proteins (RLPs) are involved in plant development and disease resistance. Only some of the RLPs in tomato ( Solanum lycopersicum L.) have been functionally characterized though 176 genes encoding RLPs, which have been identified in the tomato genome. To further understand the role of RLPs in tomato, we performed genome-guided classification and transcriptome analysis of these genes. Phylogenic comparisons revealed that the tomato RLP members could be divided into eight subgroups and that the genes evolved independently compared to similar genes in Arabidopsis...
October 2018: Plant Pathology Journal
M H Ahmad, M T Shakeel, I M Al-Shahwan, M A Al-Saleh, M A Amer
During the spring season of 2014, a total of 148 melon and watermelon leaf samples were collected from symptomatic and asymptomatic plants in the western and southwestern regions of Saudi Arabia and were tested for the presence of Watermelon chlorotic stunt virus (WmCSV) and other suspected cucurbit viruses by double antibody sandwich enzyme-linked immunosorbent assays. Ninety-eight samples were found to be positive for the presence of WmCSV, nine samples were positive for the presence of Cucurbit yellow stunting disorder virus (CYSDV), and 22 showed a mixed infection with both WmCSV and CYSDV...
October 2018: Plant Pathology Journal
Jieun Kim, Mohamed Mannaa, Namgyu Kim, Chaeyeong Lee, Juyun Kim, Jungwook Park, Hyun-Hee Lee, Young-Su Seo
The Hfq protein is a global small RNA chaperone that interacts with regulatory bacterial small RNAs (sRNA) and plays a role in the post-transcriptional regulation of gene expression. The roles of Hfq in the virulence and pathogenicity of several infectious bacteria have been reported. This study was conducted to elucidate the functions of two hfq genes in Burkholderia glumae , a causal agent of rice grain rot. Therefore, mutant strains of the rice-pathogenic B. glumae BGR1, targeting each of the two hfq genes, as well as the double defective mutant were constructed and tested for several phenotypic characteristics...
October 2018: Plant Pathology Journal
Xiaoran Wang, Junfeng Shi, Rufu Wang
This study takes strawberry-fruits as the test material and discusses the effect of Burkholderia contaminans B-1 on preventing postharvest diseases and inducing resistance-related substances in strawberry-fruits. Soaking and wound inoculating is performed to analyze the inhibitory effects of different treatment solutions on the gray mold of postharvest strawberry-fruits. The count of antagonistic bacteria colonies in the wound is found, and the dynamic growth of antagonistic bacteria and the pathogenic fungus is observed by electron microscopy...
October 2018: Plant Pathology Journal
Luz Adriana Pedraza, Jessica Bautista, Daniel Uribe-Vélez
Rice world production is affected due to the growing impact of diseases such as bacterial panicle blight, produced by Burkholderia glumae . The pathogen-induced symptoms include seedling rot, grain rot and leaf-sheath browning in rice plants. It is currently recognized the entrance of this pathogen to the plant, from infected seeds and from environmental sources of the microorganism. However, it is still not fully elucidated the dynamics and permanence of the pathogen in the plant, from its entry until the development of disease symptoms in seedlings or panicles...
October 2018: Plant Pathology Journal
Moisés Roberto Vallejo Pérez, Hugo Ricardo Navarro Contreras, Jesús A Sosa Herrera, José Pablo Lara Ávila, Hugo Magdaleno Ramírez Tobías, Fernando Díaz-Barriga Martínez, Rogelio Flores Ramírez, Ángel Gabriel Rodríguez Vázquez
Clavibacter michiganensis subsp. michiganesis ( Cmm ) is a quarantine-worthy pest in México. The implementation and validation of new technologies is necessary to reduce the time for bacterial detection in laboratory conditions and Raman spectroscopy is an ambitious technology that has all of the features needed to characterize and identify bacteria. Under controlled conditions a contagion process was induced with Cmm , the disease epidemiology was monitored. Micro-Raman spectroscopy (532 nm λ laser) technique was evaluated its performance at assisting on Cmm detection through its characteristic Raman spectrum fingerprint...
October 2018: Plant Pathology Journal
Ananya Prova, Abdul Mannan Akanda, Shaikhul Islam, Md Motaher Hossain
Stems and pods of hyacinth bean cultivated in a farmer's field in Gazipur District, Bangladesh, were found rotted in nearly 5% hyacinth bean plants. A fungus having fluffy mycelium and large sclerotia was isolated from affected tissues. Combined results of morphological, molecular and pathological analyses identified the fungus as Sclerotinia sclerotiorum (Lib) de Bary. Inoculating the fungus on healthy hyacinth bean plants and pods reproduced the symptoms previously observed in the field. The three isolates obtained from naturally infected plants were cross inoculated in hyacinth bean, okra and African-American marigold and they were pathogenic to these hosts...
October 2018: Plant Pathology Journal
Tae-Seong Yun, Sook-Young Park, Jihyun Yu, Yujin Hwang, Ki-Jeong Hong
The red flour beetle, Tribolium castaneum , is one of the most common and economically important pests of stored cereal products worldwide. Furthermore, these beetles can act as vectors for several fungal post-harvest diseases. In this study, we collected T. castaneum from 49 rice processing complexes (RPCs) nationwide during 2016-2017 and identified contaminating fungal species on the surface of the beetles. Five beetles from each region were placed on potato dextrose agar media or Fusarium selection media after wet processing with 100% relative humidity at 27°C for one week...
October 2018: Plant Pathology Journal
Sanghyun Shin, Jae-Han Son, Jong-Chul Park, Kyeong-Hoon Kim, Young-Mi Yoon, Young-Keun Cheong, Kyong-Ho Kim, Jong-Nae Hyun, Chul Soo Park, Ruth Dill-Macky, Chon-Sik Kang
Fusarium head blight (FHB) caused by Fusarium species is a major disease of wheat and barley around the world. FHB causes yield reductions and contamination of grains with trichothecene mycotoxins including; nivalenol (NIV), deoxynivalenol (DON), 3-acetyldeoxynivalenol (3-ADON), and 15-acetylde-oxynivalenol (15-ADON). The objectives of this study were to identify strains of F. graminearum isolated in Korea from 2012-harvested wheat grain and to test the pathogenicity of these NIV- and DON-producing isolates...
October 2018: Plant Pathology Journal
Gyeongjun Cho, Min-Jung Kim, Youngho Kwon, Youn-Sig Kwak
The microbiome makes a significant contribution to plant health and endophytes may generate positive effects for the host. However, there is a limited knowledge available concerning the kiwifruit endophyte. Therefore, we discuss endophyte microbiome community structures among the kiwifruit cultivars. Total reads numbered 17620 in cv. Hayward, 11515 in cv. Haegeum and 13613 in cv. Jecygold. The number of OTUs was follows: 112 in cv. Hageum; and 87 in cvs. Hayward and Jecygold. Most of the identified OTUs were phylum Proteobacteria and it emerged that Actinobacteria, Firmicute and Bacteroidetes were mainly present...
August 2018: Plant Pathology Journal
Masahiko Tamaki, Fumiyuki Kobayashi, Hiromi Ikeura, Michio Sato
To investigate the difference in the disinfectant efficiency of ozone microbubbles (O3 MB) and ozone millibubbles (O3 MMB), the morphological change of the treated Fusarium oxysporum f. sp. melonis spores was observed with scanning and transmission electron microscopies (SEM and TEM). The disinfectant efficiency of O3 MB on F. oxysporum f. sp. melonis spores was greater than that of O3 MMB. On observation with SEM, it was revealed that morphological change of F. oxysporum f. sp. melonis spores was caused by O3 MB and O3 MMB, and damage to the spore surfaces by O3 MB occurred sooner than that by O3 MMB...
August 2018: Plant Pathology Journal
In Jeong Kang, Hyeong Kwon Shim, Jae Hwan Roh, Sunggi Heu, Dong Bum Shin
Northern corn leaf spot and southern corn leaf blight caused by Cochliobolus carbonum (anamorph, Bipolaris zeicola ) and Cochliobolus heterostrophus (anamorph, Bipolaris maydis ), respectively, are common maize diseases in Korea. Accurate detection of plant pathogens is necessary for effective disease management. Based on the polyketide synthase gene (PKS) of Cochliobolus carbonum and the nonribosomal peptide synthetase gene (NRPS) of Cochliobolus heterostrophus , primer pairs were designed for PCR to simultaneously detect the two fungal pathogens and were specific and sensitive enough to be used for duplex PCR analysis...
August 2018: Plant Pathology Journal
Slavica Matić, Maria Alexandra Cucu, Angelo Garibaldi, Maria Lodovica Gullino
The effect of simulated climate changes by applying different temperatures and CO2 levels was investigated in the Blumeria graminis f. sp. tritici /wheat pathosystem. Healthy and inoculated plants were exposed in single phytotrons to six CO2 +temperature combinations: (1) 450 ppm CO2 /18-22°C (ambient CO2 and low temperature), (2) 850 ppm CO2 /18-22°C (elevated CO2 and low temperature), (3) 450 ppm CO2 /22-26°C (ambient CO2 and medium temperature), (4) 850 ppm CO2 /22-26°C (elevated CO2 and medium temperature), (5) 450 ppm CO2 /26-30°C (ambient CO2 and high temperature), and (6) 850 ppm CO2 /26-30°C (elevated CO2 and high temperature)...
August 2018: Plant Pathology Journal
Soukaina Janati, Abdellah Houari, Ahmed Wifaya, Adil Essarioui, Abdelaziz Mimouni, Abderrahim Hormatallah, Mohamed Sbaghi, Abdelfattah A Dababat, Fouad Mokrini
Root-knot nematodes ' Meloidogyne spp' are the most destructive group of plant parasitic nematodes causeing serious losses in vegetables crops and this damages worsened when crops grown under greenhouses conditions. In this sutdy, the distribution and characterization of root-knot nematode species collected from the Souss region of Morocco where vegetables crops intensively cultivated were determined by using both morphological and molecular tools. Out of the 110 samples collected from different greenhouses 91 (81...
August 2018: Plant Pathology Journal
Abraham Okki Mwamula, Hyoung-Rai Ko, Youngjoon Kim, Young Ho Kim, Jae-Kook Lee, Dong Woon Lee
The sugar beet cyst nematode, Heterodera schachtii is a well known pathogen on Chinese cabbage in the highland fields of Korea. However, a race of cyst forming nematode with close morphological resemblance to H. trifolii was recently isolated from the same Chinese cabbage fields. Morphological species differentiation between the two cyst nematodes is challenging, with only minor differences between them. Thus, this study described the newly intercepted H. trifolii population, and reviewed morphological and molecular characteristics conceivably essential in differentiating the two nematode species...
August 2018: Plant Pathology Journal
Dipto Bhattacharyya, Swarnalee Duta, Sang-Mi Yu, Sang Chul Jeong, Yong Hoon Lee
Maintenance of a beneficial microbial community, especially in the rhizosphere, is indispensable for plant growth and agricultural sustainability. In this sense, plant growth-promoting rhizobacteria (PGPR) have been extensively studied for their role in plant growth promotion and disease resistance. However, the impact of introducing PGPR strains into rhizosphere microbial communities is still underexplored. We previously found that the Proteus vulgaris JBLS202 strain (JBLS202) promoted growth of Kimchi cabbage and altered the relative abundance of total bacteria and Pseudomonas spp ...
August 2018: Plant Pathology Journal
Hélvio Gledson Maciel Ferraz, Jorge Luis Badel, Lúcio Mauro da Silva Guimarães, Bruna Paolinelli Reis, Marcos Rogério Tótola, Rivadalve Coelho Gonçalves, Acelino Couto Alfenas
Bacterial leaf blight is a major disease of eucalypt, especially under nursery conditions. Different bacterial species have been associated with the disease in several countries, and despite its importance worldwide, it is not clear to date whether similar disease symptoms are caused by the same or by different etiological agents. In this study, 43 bacterial strains were isolated from blighted eucalypt leaves collected in different geographic areas of Brazil and inoculated onto a susceptible eucalypt clone...
August 2018: Plant Pathology Journal
Qingfeng Meng, Ravi Gupta, Soon Jae Kwon, Yiming Wang, Ganesh Kumar Agrawal, Randeep Rakwal, Sang-Ryeol Park, Sun Tae Kim
Rice blast disease, caused by Magnaporthe oryzae , results in an extensive loss of rice productivity. Previously, we identified a novel M. oryzae secreted protein, termed MSP1 which causes cell death and pathogen-associated molecular pattern (PAMP)-triggered immune (PTI) responses in rice. Here, we report the transcriptome profile of MSP1-induced response in rice, which led to the identification of 21,619 genes, among which 4,386 showed significant changes ( P < 0.05 and fold change > 2 or < 1/2) in response to exogenous MSP1 treatment...
August 2018: Plant Pathology Journal
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