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Ilkwon Park - One of the best experts on this subject based on the ideXlab platform.
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reactive oxygen species mediated antifungal activity of cinnamon bark cinnamomum verum and lemongrass cymbopogon citratus essential oils and their constituents against two Phytopathogenic Fungi
Pesticide Biochemistry and Physiology, 2020Co-Authors: Ilkwon ParkAbstract:Abstract To find new and safe type of control agents against Phytopathogenic Fungi, the fumigant antifungal activity of 10 plant essential oils and constituents identified in cinnamon bark (Cinnamomum verum) and lemongrass (Cymbopogon citratus) essential oils was investigated against two Phytopathogenic Fungi, Raffaelea quercus-mongolicae and Rhizoctonia solani. Among plant essential oils, cinnamon bark and lemongrass essential oils showed 100% inhibition of R. quercus-mongolicae and R. solani at 5 mg/paper disc, respectively. Among test constituents, salicylaldehyde, eugenol, and hydrocinnamaldehyde showed 100% inhibition of growth of R. quercus-mongolicae at 2.5 mg/paper disc. Neral, geraniol, geranial, trans-cinnamaldehyde, methyl cinnamate, isoeugenol, and methyl eugenol exhibited >80% inhibition of growth of R. quercus-mongolicae at 2.5 mg/paper disc. Neral, geranial, trans-cinnamaldehyde, hydrocinnamaldehyde, and salicylaldehyde showed 100% inhibition of growth of R. solani at 2.5 mg/paper disc. A fumigant antifungal bioassay of artificial blends of the constituents identified in cinnamon bark and lemongrass essential oils indicated that trans-cinnamaldehyde and geranial were major contributors to the fumigant antifungal activity of the artificial blend. Confocal laser scanning microscopy images of Fungi treated with cinnamon bark and lemongrass essential oils, trans-cinnamaldehyde, neral, and geranial revealed the reactive oxygen species (ROS) generation and cell membrane disruption.
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effects of plant essential oils and components from oriental sweetgum liquidambar orientalis on growth and morphogenesis of three Phytopathogenic Fungi
Pesticide Biochemistry and Physiology, 2009Co-Authors: Yeonsuk Lee, Sangchul Shin, Junheon Kim, Sanggil Lee, Ilkwon ParkAbstract:Abstract Commercial plant essential oils obtained from 40 plant species were tested for their antifungal activity against Phytophthora cactorum , Cryphonectria parasitica , and Fusarium circinatum. Strong antifungal activity against Phytophthora cactorum was achieved with the essential oil derived from Oriental sweetgum, Liquidambar orientalis at 28 × 10 −3 mg/mL air concentration. In a test with C. parasitica , inhibition rate of patchouli was 51.0%, whereas the other essential oils showed weak activity. Essential oils of manuka ( Leptospermum scoparium ) and patchouli ( Pagostemon patchouli ) showed moderate activity against F. circinatum . Analysis by gas chromatography–mass spectrometry led to identification of 11 compounds in the oil of L. orientalis. The antifungal activity of identified compounds was tested singularly by using standard or synthesized compounds. Inhibition rates of cinnamyl aldehyde and benzaldehyde were 100% against P. cactorum at 28 × 10 −3 mg/mL air concentration. There was a significant morphological alternation in three Phytopathogenic Fungi after oil or compound treatment.
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in vivo Fungicidal activity of medicinal plant extracts against six Phytopathogenic Fungi
International Journal of Pest Management, 2008Co-Authors: Ilkwon Park, Sangchul ShinAbstract:Abstract Methanol extracts from 27 medicinal plant species were tested at concentrations of 0.5, 1 and 2 mg/mL for their in vivo Fungicidal activities against six Phytopathogenic Fungi. Their efficacy varied with plant pathogen, tissue sampled and plant species. Very strong Fungicidal activity was produced by extracts of Boswellia carterii, Saussurea lappa, Glycyrrhiza uralensis, Piper nigrum, Rheum coreanum, Lysimachia foenum-graecum, Evodia officinalis, Santalum album and Curcuma longa at 2 mg/mL. At 1 mg/mL, S. album, P. nigrum and L. foenum-graecum showed potent Fungicidal activity against Blumeria graminis f. sp. hordei, Puccinia recondita and Magnaporthe grisea, respectively. Lysimachia foenum-graecum exhibited strong Fungicidal activity against M. grisea at 0.5 mg/mL.
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in vivo Fungicidal activity of medicinal plant extracts against six Phytopathogenic Fungi
International Journal of Pest Management, 2008Co-Authors: Ilkwon Park, Sangchul ShinAbstract:Abstract Methanol extracts from 27 medicinal plant species were tested at concentrations of 0.5, 1 and 2 mg/mL for their in vivo Fungicidal activities against six Phytopathogenic Fungi. Their efficacy varied with plant pathogen, tissue sampled and plant species. Very strong Fungicidal activity was produced by extracts of Boswellia carterii, Saussurea lappa, Glycyrrhiza uralensis, Piper nigrum, Rheum coreanum, Lysimachia foenum-graecum, Evodia officinalis, Santalum album and Curcuma longa at 2 mg/mL. At 1 mg/mL, S. album, P. nigrum and L. foenum-graecum showed potent Fungicidal activity against Blumeria graminis f. sp. hordei, Puccinia recondita and Magnaporthe grisea, respectively. Lysimachia foenum-graecum exhibited strong Fungicidal activity against M. grisea at 0.5 mg/mL.
Guilong Zhang - One of the best experts on this subject based on the ideXlab platform.
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stilbene derivatives from photorhabdus temperata sn259 and their antifungal activities against Phytopathogenic Fungi
Journal of Agricultural and Food Chemistry, 2017Co-Authors: Danshu Shi, Wenbo Zhang, Guilong ZhangAbstract:Chemical investigation of an insect pathogenic enterobacterium, Photorhabdus temperata SN259, led to the isolation and identification of seven metabolites, which include three new compounds, 3-hydroxy-2-isopropyl-5-phenethylphenyl carbamate, 1, 2-(1-hydroxypropan-2-yl)-5-[2-phenylethyl]benzene-1,3-diol, 2, 2-(1-hydroxypropan-2-yl)-5-[(E)-2-phenylethenyl]benzene-1,3-diol, 3, and four known metabolites (4–7). Their structures were elucidated on the basis of MS and NMR data and by comparison with those reported previously. The activities of compounds 1–7 were evaluated against four Phytopathogenic Fungi (Pythium aphanidermatum, Rhizoctonia solani Kuhn, Exserohilum turcicum, and Fusarium oxysporum). In an agar medium assay, compounds 1 and 7 showed strong inhibition against P. aphanidermatum with EC50 values of 2.8 and 2.7 μg/mL, respectively. By comparing the structure of compounds 1–7, we deduced that the acylamino group in compound 1 and the isopropyl group in compound 7 contribute to the inhibitory activity.
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Stilbene Derivatives from Photorhabdus temperata SN259 and Their Antifungal Activities against Phytopathogenic Fungi
2016Co-Authors: Danshu Shi, Wenbo Zhang, Guilong ZhangAbstract:Chemical investigation of an insect pathogenic enterobacterium, Photorhabdus temperata SN259, led to the isolation and identification of seven metabolites, which include three new compounds, 3-hydroxy-2-isopropyl-5-phenethylphenyl carbamate, 1, 2-(1-hydroxypropan-2-yl)-5-[2-phenylethyl]benzene-1,3-diol, 2, 2-(1-hydroxypropan-2-yl)-5-[(E)-2-phenylethenyl]benzene-1,3-diol, 3, and four known metabolites (4–7). Their structures were elucidated on the basis of MS and NMR data and by comparison with those reported previously. The activities of compounds 1–7 were evaluated against four Phytopathogenic Fungi (Pythium aphanidermatum, Rhizoctonia solani Kuhn, Exserohilum turcicum, and Fusarium oxysporum). In an agar medium assay, compounds 1 and 7 showed strong inhibition against P. aphanidermatum with EC50 values of 2.8 and 2.7 μg/mL, respectively. By comparing the structure of compounds 1–7, we deduced that the acylamino group in compound 1 and the isopropyl group in compound 7 contribute to the inhibitory activity
Yunfeng Wu - One of the best experts on this subject based on the ideXlab platform.
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reply to serra et al nucleotide substitutions in plant viroid genomes that multiply in Phytopathogenic Fungi
Proceedings of the National Academy of Sciences of the United States of America, 2020Co-Authors: Ruiling Bian, Ida Bagus Andika, Hideki Kondo, Liu Yang, Hongsheng Zhou, Tianxing Pang, Ziqian Lian, Yunfeng WuAbstract:This is our response to the letter by Serra et al. (1), which questioned our recent paper (2) describing plant viroid infections in Phytopathogenic Fungi. In this study, full-length monomeric cDNA clones of seven plant viroid RNA genomes were produced using oligonucleotide synthesis (2). We opted for the monomeric version of viroid cDNA clone, considering that it requires shorter sequences for oligonucleotide synthesis and because of noting an article showing the infectivity of the monomeric cDNA clone of a viroid (3). We constructed plasmid constructs for in vitro transcriptions by placing the viroid cDNA sequence immediately after a T7 promoter sequence and incorporating a restriction site (HindIII or SpeI) into the 3′ terminus (2). Due to the large number of samples, the infectivity of monomeric viroid cDNA transcripts was assayed by RT-PCR, and indeed, all of the RT-PCR products derived from the detection of viroid RNA accumulation in plants, yeast, and Fungi inoculated with viroid RNA transcripts were verified by DNA … [↵][1]2To whom correspondence may be addressed. Email: sunliying{at}nwafu.edu.cn. [1]: #xref-corresp-1-1
Ghulam Abbas - One of the best experts on this subject based on the ideXlab platform.
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exploring the potentials of lysinibacillus sphaericus za9 for plant growth promotion and biocontrol activities against Phytopathogenic Fungi
Frontiers in Microbiology, 2017Co-Authors: Zakira Naureen, Najeeb Ur Rehman, Hidayat Hussain, Javid Hussain, Syed Amir Gilani, Saif Khalfan Al Housni, Fazal Mabood, Abdul Latif Khan, Saima Farooq, Ghulam AbbasAbstract:There is an ongoing hunt for biologically-active compounds that can combat Phytopathogenic Fungi and improve plant growth without causing any hazards to the environment. Consequently the present study aims at deciphering the plant growth promotion and antifungal capability of Lysinibacilluys sphaericus ZA9. The bacterium was previously isolated and identified in our laboratory from maize rhizosphere using 16S rRNA gene sequencing. The test bacterium Lysinibacillus sphaericus ZA9 was found to produce high quantity of IAA (697 µg/ mL); siderophores (195.79 µg/ mL), HCN and hydrolytic enzyme as compared to the reference strain Bacillus sphaericus Z2-7. The bacterium was also capable of solubilizing silicates (Si), phosphates (P) and potassium (K). The bacterium enhanced the seedling vigour and germination of seeds pretreated with it and promoted the shoot length of both cucumber and tomato seeds in greenhouse experiment. Lysinibacillus sphaericus ZA9 and its cell free culture supernatant (CFCS) showed varied antaganoistic behaviour against Alternaria alternata, Curvularia lunata, Aspergillus sp., Sclerotinia sp., Bipolaris spicifera, Trichophyton sp. Fermentation broth culture of Lysinibacillus sphaericus ZA9 was then used to isolate antifungal metabolites by silica column chromatography. Identification and determination of antifungal compounds was carried out by Thin-layer chromatography (TLC) followed by NMR spectroscopy. Two compounds were isolated and identified as 2-pentyl-4-quinolinecarboxylic acid (C15H17NO2) which is a quinoline alkaloid and 1- methylcyclohexene which is a cycloalkene. Compound 1; 2-Penthyl-4-quinolinecarboxylic acid was found to be highly antagonistic against most of the Fungi tested as compared to the bacterium itself. Its activity was comparable to that of Fungicide Benlate , while compound 2; 1- methylcyclohexene did not show any antifungal activity.
Francesco Di Serio - One of the best experts on this subject based on the ideXlab platform.
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symptomatic plant viroid infections in Phytopathogenic Fungi a request for a critical reassessment
Proceedings of the National Academy of Sciences of the United States of America, 2020Co-Authors: P Serra, Alberto Carbonell, Selma Gagozachert, Beatriz Navarro, Shifang Li, Francesco Di SerioAbstract:Since their discovery (1), viroids—small (∼250 to 430 nt), non–protein-coding, circular RNAs—are thought to infect and cause disease only in plants (2); thus, the report that they infect and incite symptoms in filamentous Phytopathogenic Fungi (3) is surprising. Viroids are classified into two families (4). Members of the Pospiviroidae , including potato spindle tuber viroid (PSTVd) (1, 5), replicate in the nucleus through an RNA–RNA rolling-circle mechanism catalyzed by host enzymes (RNA polymerase, RNase, and RNA ligase). Members of the Avsunviroidae , like peach latent mosaic viroid (PLMVd) (6), form hammerhead ribozymes (HHRz) that functionally substitute the RNase during replication in chloroplasts (4). The host range of the second family is restricted to plant species (or relatives) in which the viroids were described. Unexpectedly, Wei et al. (3) report that seven viroids, including PLMVd and avocado sunblotch viroid (ASBVd) (both of the Avsunviroidae ), infect Nicotiana benthamiana , a known host for only some members of … [↵][1]1To whom correspondence may be addressed. Email: rflores{at}ibmcp.upv.es or francesco.diserio{at}ipsp.cnr.it. [1]: #xref-corresp-1-1
