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Plant Pathology Journal

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https://www.readbyqxmd.com/read/30140188/comparison-of-endophytic-microbial-community-in-kiwifruit-plant-cultivars
#1
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
https://www.readbyqxmd.com/read/30140187/disinfection-by-ozone-microbubbles-can-cause-morphological-change-of-fusarium-oxysporum-f-sp-melonis-spores
#2
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
https://www.readbyqxmd.com/read/30140186/simple-detection-of-cochliobolus-fungal-pathogens-in-maize
#3
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
https://www.readbyqxmd.com/read/30140185/combined-effect-of-co-2-and-temperature-on-wheat-powdery-mildew-development
#4
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
https://www.readbyqxmd.com/read/30140184/occurrence-of-the-root-knot-nematode-species-in-vegetable-crops-in-souss-region-of-morocco
#5
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
https://www.readbyqxmd.com/read/30140183/morphological-and-molecular-characterization-of-heterodera-schachtii-and-the-newly-recorded-cyst-nematode-h-trifolii-associated-with-chinese-cabbage-in-korea
#6
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
https://www.readbyqxmd.com/read/30140182/taxonomic-and-functional-changes-of-bacterial-communities-in-the-rhizosphere-of-kimchi-cabbage-after-seed-bacterization-with-proteus-vulgaris-jbls202
#7
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
https://www.readbyqxmd.com/read/30140181/-xanthomonas-axonopodis-pv-eucalyptorum-pv-nov-causing-bacterial-leaf-blight-on-eucalypt-in-brazil
#8
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
https://www.readbyqxmd.com/read/30140180/transcriptomic-analysis-of-oryza-sativa-leaves-reveals-key-changes-in-response-to-magnaporthe-oryzae-msp1
#9
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
https://www.readbyqxmd.com/read/29887781/genomic-insights-into-nematicidal-activity-of-a-bacterial-endophyte-raoultella-ornithinolytica-mg-against-pine-wilt-nematode
#10
Gnanendra Shanmugam, Akanksha Dubey, Lakshmi Narayanan Ponpandian, Soon Ok Rim, Sang-Tae Seo, Hanhong Bae, Junhyun Jeon
Pine wilt disease, caused by the nematode Bursaphelenchus xylophilus , is one of the most devastating conifer diseases decimating several species of pine trees on a global scale. Here, we report the draft genome of Raoultella ornithinolytica MG, which is isolated from mountain-cultivated ginseng plant as an bacterial endophyte and shows nematicidal activity against B. xylophilus . Our analysis of R. ornithinolytica MG genome showed that it possesses many genes encoding potential nematicidal factors in addition to some secondary metabolite biosynthetic gene clusters that may contribute to the observed nematicidal activity of the strain...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887780/biocontrol-efficacy-of-formulated-pseudomonas-chlororaphis-o6-against-plant-diseases-and-root-knot-nematodes
#11
Hyo Song Nam, Anne J Anderson, Young Cheol Kim
Commercial biocontrol of microbial plant diseases and plant pests, such as nematodes, requires field-effective formulations. The isolate Pseudomonas chlororaphis O6 is a Gram-negative bacterium that controls microbial plant pathogens both directly and indirectly. This bacterium also has nematocidal activity. In this study, we report on the efficacy of a wettable powder-type formulation of P. chlororaphis O6. Culturable bacteria in the formulated product were retained at above 1 × 108 colony forming units/g after storage of the powder at 25 °C for six months...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887779/optical-sensing-for-evaluating-the-severity-of-disease-caused-by-cladosporium-sp-in-barley-under-warmer-conditions
#12
Dohyeok Oh, Jae-Hyun Ryu, Sehee Oh, Hoejeong Jeong, Jisung Park, Rae-Dong Jeong, Wonsik Kim, Jaeil Cho
Crop yield is critically related to the physiological responses and disease resistance of the crop, which could be strongly affected by high temperature conditions. We observed the changes in the growth of barley under higher than ambient air-temperature conditions using a temperature gradient field chamber (TGFC) during winter and spring. Before the stem extension stage of barley growth, Cladosporium sp. spontaneously appeared in the TGFC. The severity of disease became serious under warmer temperature conditions...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887778/growth-promoting-rhizospheric-and-endophytic-bacteria-from-curcuma-longa-l-as-biocontrol-agents-against-rhizome-rot-and-leaf-blight-diseases
#13
G Vinayarani, H S Prakash
Plant growth promoting rhizobacteria and endophytic bacteria were isolated from different varieties of turmeric ( Curcuma longa L.) from South India. Totally 50 strains representing, 30 PGPR and 20 endophytic bacteria were identified based on biochemical assays and 16S rDNA sequence analysis. The isolates were screened for antagonistic activity against Pythium aphanidermatum (Edson) Fitzp., and Rhizoctonia solani Kuhn., causing rhizome rot and leaf blight diseases in turmeric, by dual culture and liquid culture assays...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887777/isolation-and-identification-of-endophytic-bacteria-with-plant-growth-promoting-activity-and-biocontrol-potential-from-wild-pistachio-trees
#14
Faegheh Etminani, Behrouz Harighi
In this study, samples were collected from the leaves and stems of healthy wild Pistachio trees ( Pistacia atlantica L.) from various locations of Baneh and Marivan regions, Iran. In total, 61 endophytic bacteria were isolated and grouped according to phenotypic properties. Ten selected isolates from each group were further identified by partial sequencing of the 16S rRNA gene. Based on the results, isolates were identified as bacteria belonging to Pseudomonas , Stenotrophomonas , Bacillus , Pantoea and Serratia genus...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887776/phylogenetic-characterization-of-tomato-chlorosis-virus-population-in-korea-evidence-of-reassortment-between-isolates-from-different-origins
#15
Ye-Ji Lee, Eui-Joon Kil, Hae-Ryun Kwak, Mikyeong Kim, Jang-Kyun Seo, Sukchan Lee, Hong-Soo Choi
Tomato chlorosis virus (ToCV) is a whitefly-transmitted and phloem-limited crinivirus. In 2013, severe interveinal chlorosis and bronzing on tomato leaves, known symptoms of ToCV infection, were observed in greenhouses in Korea. To identify ToCV infection in symptomatic tomato plants, RT-PCR with ToCV-specific primers was performed on leaf samples collected from 11 tomato cultivating areas where ToCV-like symptoms were observed in 2013 and 2014. About half of samples (45.18%) were confirmed as ToCV-infected, and the complete genome of 10 different isolates were characterized...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887775/development-of-an-improved-loop-mediated-isothermal-amplification-assay-for-on-site-diagnosis-of-fire-blight-in-apple-and-pear
#16
Doo-San Shin, Gwang-Il Heo, Soo-Hyeong Son, Chang-Sik Oh, Young-Kee Lee, Jae-Soon Cha
Fast and accurate diagnosis is needed to eradicate and manage economically important and invasive diseases like fire blight. Loop-mediated isothermal amplification (LAMP) is known as the best on-site diagnostic, because it is fast, highly specific to a target, and less sensitive to inhibitors in samples. In this study, LAMP assay that gives more consistent results for on-site diagnosis of fire blight than the previous developed LAMP assays was developed. Primers for new LAMP assay (named as DS-LAMP) were designed from a histidine-tRNA ligase gene (EAMY_RS32025) of E...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887774/identification-of-two-new-races-of-podosphaera-xanthii-causing-powdery-mildew-in-melon-in-south-korea
#17
Ye-Ji Hong, Mohammad Rashed Hossain, Hoy-Taek Kim, Jong-In Park, Ill-Sup Nou
Powdery mildew caused by the obligate biotrophic fungus Podosphaera xanthii poses a serious threat to melon ( Cucumis melo L.) production worldwide. Frequent occurrences of the disease in different regions of South Korea hints at the potential existence of several races which need to be identified. The races of five isolates collected from different powdery mildew affected regions were identified based on the pathogenicity tests of these isolates on eight known differential melon cultigens namely, SCNU1154, PMR 45, WMR 29, PMR 5, MR-1, PI124112, Edisto 47 and PI414723...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887773/diagnosis-and-integrated-management-of-fruit-rot-in-cucurbita-argyrosperma-caused-by-sclerotium-rolfsii
#18
José Francisco Díaz Nájera, Jaime Sahagún Castellanos, Mateo Vargas Hernández, Sergio Ayvar Serna, Omar Guadalupe Alvarado Gómez, Clemente Villanueva Verduzco, Marcelo Acosta Ramos
Fruit rot is the principal phytopathological problem of pipiana pumpkin ( Cucurbita argyrosperma Huber) in the state of Guerrero. The aims of this research were to 1) identify the causal agent of southern blight on pumpkin fruits by morphological, pathogenic, and molecular analysis (ITS1, 5.8S, ITS2); 2) evaluate in vitro Trichoderma spp. strains and chemical fungicides; and 3) evaluate under rainfed field conditions, the strains that obtained the best results in vitro , combined with fungicides during two crop cycles...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887772/development-qrt-pcr-protocol-to-predict-strawberry-fusarium-wilt-occurrence
#19
Sung Won Hong, Da-Ran Kim, Ji Su Kim, Gyeongjun Cho, Chang Wook Jeon, Youn-Sig Kwak
Strawberry Fusarium wilt disease, caused by Fusarium oxysporum f. sp. fragariae , is the most devastating disease in strawberry production. The pathogen produces chlamydospores which tolerate against harsh environment, fungicide and survive for decades in soil. Development of detection and quantification techniques are regarded significantly in many soilborne pathogens to prevent damage from diseases. In this study, we improved specific-quantitative primers for F. oxysporum f. sp. fragariae to reveal correlation between the pathogen density and the disease severity...
June 2018: Plant Pathology Journal
https://www.readbyqxmd.com/read/29887771/physiological-and-molecular-characterization-of-cephaleuros-virescens-occurring-in-mango-trees
#20
Camila Vilela Vasconcelos, Fabíola Teodoro Pereira, Elizabeth Amélia Alves Duarte, Thiago Alves Santos de Oliveira, Nei Peixoto, Daniel Diego Costa Carvalho
The objective of this work was to accomplish the isolation, molecular identification and characterizing the physiology of the causal agent of the algal spot in mango trees. For this purpose, the pathogen growth was assessed in different culture media, with subsequent observation and measurements of the filamentous cells. The molecular identification was made using mycelium obtained from leaf lesions and pure algae colonies grown in culture medium. Descriptions based on DNA sequencing indicated that the algae is Cephaleuros virescens ...
June 2018: Plant Pathology Journal
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