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Sugiura R, Arazoe T, Motoyama T, Osada H, Kamakura T, Kuramochi K, Furuyama Y. Pyricularia oryzae enhances Streptomyces griseus growth via non-volatile alkaline metabolites. ENVIRONMENTAL MICROBIOLOGY REPORTS 2024; 16:e70012. [PMID: 39313864 PMCID: PMC11420290 DOI: 10.1111/1758-2229.70012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Accepted: 09/03/2024] [Indexed: 09/25/2024]
Abstract
Chemical compounds that affect microbial interactions have attracted wide interest. In this study, Streptomyces griseus showed enhanced growth when cocultured with the rice blast fungus Pyricularia oryzae on potato dextrose agar (PDA) medium. An improvement in S. griseus growth was observed before contact with P. oryzae, and no growth-promoting effect was observed when the growth medium between the two microorganisms was separated. These results suggested that the chemicals produced by P. oryzae diffused through the medium and were not volatile. A PDA plate supplemented with phenol red showed that the pH of the area surrounding P. oryzae increased. The area with increased pH promoted S. griseus growth, suggesting that the alkaline compounds produced by P. oryzae were involved in this growth stimulation. In contrast, coculture with the soilborne plant pathogen Fusarium oxysporum and entomopathogenic fungus Cordyceps tenuipes did not promote S. griseus growth. Furthermore, DL-α-Difluoromethylornithine, a polyamine biosynthesis inhibitor, prevented the increase in pH and growth promotion of S. griseus by P. oryzae. These results indicated that P. oryzae increased pH by producing a polyamine.
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Affiliation(s)
- Risa Sugiura
- Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda‐shiJapan
| | - Takayuki Arazoe
- Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda‐shiJapan
| | - Takayuki Motoyama
- Plant Immunity Research GroupRIKEN Center for Sustainable Resource Science (CSRS)Wako‐shiJapan
| | | | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda‐shiJapan
| | - Kouji Kuramochi
- Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda‐shiJapan
| | - Yuuki Furuyama
- Department of Applied Biological Science, Faculty of Science and TechnologyTokyo University of ScienceNoda‐shiJapan
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Hou Y, Guo Y, Cheng Z, Liu S, Yang Y, Li Y, Liu S, Hou X, Xu J. Inhibitory Activities of Five Fungicides on Alternaria suffruticosae and Their Field Control Efficacy Against Tree Peony Black Spot. PLANT DISEASE 2024; 108:2830-2837. [PMID: 38698518 DOI: 10.1094/pdis-01-24-0153-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Tree peony black spot (TPBS), mainly caused by Alternaria suffruticosae, is a common leaf disease on the ornamental peony, which poses a great threat to the flower buds in the current year and the flowering quality in the next year. However, there is only one fungicide registered for the control of this disease, difenoconazole. In order to avoid the severe problem of pathogen resistance caused by long-term use of difenoconazole, it is necessary to screen more chemical fungicides for the prevention and control of TPBS. In this study, the biological activities of flutolanil, phenamacril, pyraclostrobin, and boscalid on mycelial growth, conidial germination, germ tube elongation, and sporulation quantity of A. suffruticosae were determined, and the field control efficacy was tested to evaluate the preventive and therapeutic activities. Difenoconazole was used as a control simultaneously. The results showed that pyraclostrobin had the strongest inhibitory effects on the conidial germination, mycelium growth, germ tube elongation, and sporulation quantity, with the average EC50 values of 0.0517, 0.5343, 0.0008, and 0.8068 μg/ml, respectively. The inhibitory activity of flutolanil on the four developmental stages of A. suffruticosae was weaker than that of the other three fungicides. Compared with flutolanil, boscalid, the other succinate dehydrogenase inhibitor, had more strong inhibitory effects on the mycelial growth and sporulation quantity, with the average EC50 values of 3.8603 and 1.4760 μg/ml, respectively. Phenamacril had a moderate inhibitory level and had more inhibitory activity on conidial germination and germ tube elongation, with the average EC50 values of 31.5349 and 5.2597 μg/ml, respectively. All of the four fungicides had no significant effects on the shape of spores and germ tubes. The control fungicide difenoconazole had the strongest inhibitory activity on mycelial growth, and the average EC50 value was only 0.3297 μg/ml. However, its inhibitory activity on the other three growth stages was not high. In the field trials, pyraclostrobin had high control efficacy on TPBS even at low concentrations, reaching a minimum of 62.6293%, which was higher than that of difenoconazole. The other three fungicides had higher control efficacy at high concentrations but decreased significantly at low concentrations. Considering the dosage and control efficacy, pyraclostrobin was the first choice for the control of TPBS. Pyraclostrobin is the preferred alternative fungicide to difenoconazole for the prevention and control of TPBS in production.
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Affiliation(s)
- Ying Hou
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471003 Henan Province, China
- University Key Laboratory of Microbiology Resources Development and Utilization, Henan University of Science and Technology, Luoyang 471023, China
| | - Yuwei Guo
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471003, China
| | - Zejun Cheng
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471003, China
| | - Shaodan Liu
- International Peony Garden, Luoyang 471011, Henan Province, China
| | - Yingying Yang
- National Flower Park of China, Luoyang 471023, Henan Province, China
| | - Yihao Li
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471003 Henan Province, China
| | - Shengming Liu
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471003, China
| | - Xiaogai Hou
- College of Agriculture/Tree Peony, Henan University of Science and Technology, Luoyang 471003, China
- Henan Provincial Key Laboratory of Peony Characteristic Resource Plants, Henan University of Science and Technology, Luoyang 471003, Henan Province, China
| | - Jianqiang Xu
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471003, China
- Henan Provincial Key Laboratory of Peony Characteristic Resource Plants, Henan University of Science and Technology, Luoyang 471003, Henan Province, China
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Cheng X, Xu Z, Cui H, Zhang Z, Chen W, Wang F, Li S, Liu Q, Wang D, Lv X, Chang X. Discovery of Pyrazole-5-yl-amide Derivatives Containing Cinnamamide Structural Fragments as Potential Succinate Dehydrogenase Inhibitors. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37922127 DOI: 10.1021/acs.jafc.3c04355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
To promote the development of novel agricultural succinate dehydrogenase inhibitor (SDHI) fungicides, we introduced cinnamamide and nicotinamide structural fragments into the structure of pyrazol-5-yl-amide by carbon chain extension and scaffold hopping, respectively, and synthesized a series of derivatives. The results of the biological activity assays indicated that most of the target compounds exhibited varying degrees of inhibitory activity against the tested fungi. Notably, compounds G22, G28, G34, G38, and G39 exhibited excellent in vitro antifungal activities against Valsa mali with EC50 values of 0.48, 0.86, 0.57, 0.73, and 0.87 mg/L, respectively, and this result was significantly more potent than boscalid (EC50 = 2.80 mg/L) and closer to the specialty control drug tebuconazole (EC50 = 0.30 mg/L). Compounds G22 and G34 also exhibited excellent in vivo protective and curative effects against V. mali at 40 mg/L. The SEM and TEM observations indicated that compounds G22 and G34 may affect normal V. mali mycelial morphology as well as the cellular ultrastructure. Molecular docking analysis results indicated that G22 and boscalid possessed a similar binding mode to that of SDH, and detailed SDH inhibition assays validated the feasibility of the designed compounds as potential SDH inhibitors. Compounds G22 and G3 were selected for theoretical calculations, and the terminal carboxylic acid group of this series of compounds may be a key region influencing the antifungal activity. Furthermore, toxicity tests on Apis mellifera l. revealed that compounds G22 and G34 exhibited low toxicity to A. mellifera l. populations. The above results demonstrated that these series of pyrazole-5-yl-amide derivatives are promising for development as potential low-risk drug-resistance agricultural SDHI fungicides.
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Affiliation(s)
- Xiang Cheng
- Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Zonghan Xu
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Hongyun Cui
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Zhen Zhang
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Wei Chen
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Fanglei Wang
- Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Shanlu Li
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Qixuan Liu
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Dandan Wang
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Xianhai Lv
- Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
- School of Science, Anhui Agricultural University, Hefei 230036, China
| | - Xihao Chang
- Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
- School of Science, Anhui Agricultural University, Hefei 230036, China
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Ahmed AIM, Macirella R, Talarico F, Curcio V, Trotta G, Aiello D, Gharbi N, Mezzasalma M, Brunelli E. Short-term effects of the strobilurin fungicide dimoxystrobin on zebrafish gills: A morpho-functional study. CHEMOSPHERE 2023; 333:138914. [PMID: 37187376 DOI: 10.1016/j.chemosphere.2023.138914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 05/17/2023]
Abstract
Strobilurins represent the most widely used class of fungicides nowadays andare considered relatively non-toxic to mammals and birds but highly toxic to aquatic biota. Dimoxystrobin is one of the novel strobilurins, recently included in the 3rd Watch List of the European Commission as available data indicate that it could pose a significant risk to aquatic species. As yet, the number of studies explicitly assessing the impact of this fungicide on terrestrial and aquatic species is extremely low, and the toxic effects of dimoxystrobin on fish have not been reported. Here we investigate for the first time the alterations induced by two environmentally relevant and very low concentrations of dimoxystrobin (6.56 and 13.13 μg/L) in the fish gills. morphological, morphometric, ultrastructural, and functional alterations have been evaluated using zebrafish as a model species. We demonstrated that even short-term exposure (96 h) to dimoxystrobin alters fish gills reducing the surface available for gas exchange and inducing severe alterations encompassing three reaction patterns: circulatory disturbance and both regressive and progressive changes. Furthermore, we revealed that this fungicide impairs the expression of key enzymes involved in osmotic and acid-base regulation (Na+/K+-ATPase and AQP3) and the defensive response against oxidative stress (SOD and CAT). The information presented here highlights the importance of combining data from different analytical methods for evaluating the toxic potential of currently used and new agrochemical compounds. Our results will also contribute to the discussion on the suitability of mandatory ecotoxicological tests on vertebrates before the introduction on the market of new compounds.
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Affiliation(s)
- Abdalmoiz I M Ahmed
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy
| | - Rachele Macirella
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy
| | - Federica Talarico
- Natural History Museum and Botanical Garden, University of Calabria, 87036 Rende, Italy
| | - Vittoria Curcio
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy
| | - Giuseppe Trotta
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy
| | - Donatella Aiello
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Arcavacata di Rende, Italy
| | - Naouel Gharbi
- Fish Biology and Aquaculture Group, Ocean and Environment Department, NORCE Norwegian Research Center, 5006 Bergen, Norway
| | - Marcello Mezzasalma
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy
| | - Elvira Brunelli
- Department of Biology, Ecology and Earth Science (DiBEST) - University of Calabria, Via P. Bucci 4/B, 87036, Rende, Cosenza, Italy.
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Bio-Fabrication of ZnONPs from Alkalescent Nucleoside Antibiotic to Control Rice Blast: Impact on Pathogen ( Magnaporthe grisea) and Host (Rice). Int J Mol Sci 2023; 24:ijms24032778. [PMID: 36769154 PMCID: PMC9918085 DOI: 10.3390/ijms24032778] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 02/05/2023] Open
Abstract
In the traditional method of the bio-fabrication of zinc oxide nanoparticles (ZnONPs), bacterial strains face metal toxicity and antimicrobial action. In the current study, an alkalescent nucleoside antibiotic was mixed with zinc hexanitrate to fabricate the ZnONPs. An integrated approach of DIAION HP-20 macroporous resin and sephadex LH-20 column chromatography was adopted to separate and purify alkalescent nucleoside AN03 from Streptomyces koyanogensis. Alkalescent nucleoside was confirmed by the Doskochilova solvent system. The bio-fabricated ZnONPs were characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), and transmission electron microscopy (TEM) analyses. The XRD spectrum and the TEM images confirmed the crystallinity and the spherical shape of the ZnONPs with an average size of 22 nm. FTIR analysis showed the presence of functional groups, which confirmed the bio-fabrication of ZnONPs from alkalescent nucleoside ANO3. In-vitro studies showed that 75 μg/mL of ZnONPs had a strong inhibitory zone (28.39 mm) against the Magnaporthe grisea and significantly suppressed the spore germination. SEM and TEM observations respectively revealed that ZnONPs caused breakage in hyphae and could damage the cells of M. grisea. Greenhouse experiments revealed that the foliar spray of ZnONPs could control the rice blast disease by 98%. Results also revealed that ZnONPs had positive effects on the growth of the rice plant. The present study suggested that ZnONPs could be fabricated from microbe-derived nucleoside antibiotics without facing the problems of metal toxicity and antimicrobial action, thus overcoming the problem of pathogen resistance. This could be a potent biocontrol agent in rice blast disease management.
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Exploration of Novel Scaffolds Targeting Cytochrome b of Pyricularia oryzae. Int J Mol Sci 2023; 24:ijms24032705. [PMID: 36769028 PMCID: PMC9917009 DOI: 10.3390/ijms24032705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 02/04/2023] Open
Abstract
The fulfilment of the European "Farm to Fork" strategy requires a drastic reduction in the use of "at risk" synthetic pesticides; this exposes vulnerable agricultural sectors-among which is the European risiculture-to the lack of efficient means for the management of devastating diseases, thus endangering food security. Therefore, novel scaffolds need to be identified for the synthesis of new and more environmentally friendly fungicides. In the present work, we employed our previously developed 3D model of P. oryzae cytochrome bc1 (cyt bc1) complex to perform a high-throughput virtual screening of two commercially available compound libraries. Three chemotypes were selected, from which a small collection of differently substituted analogues was designed and synthesized. The compounds were tested as inhibitors of the cyt bc1 enzyme function and the mycelium growth of both strobilurin-sensitive (WT) and -resistant (RES) P. oryzae strains. This pipeline has permitted the identification of thirteen compounds active against the RES cyt bc1 and five compounds that inhibited the WT cyt bc1 function while inhibiting the fungal mycelia only minimally. Serendipitously, among the studied compounds we identified a new chemotype that is able to efficiently inhibit the mycelium growth of WT and RES strains by ca. 60%, without inhibiting the cyt bc1 enzymatic function, suggesting a different mechanism of action.
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Luo B, Ning Y, Rao B. Comprehensive Overview of β-Methoxyacrylate Derivatives as Cytochrome bc1 Inhibitors for Novel Pesticide Discovery. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:15615-15630. [PMID: 36480156 DOI: 10.1021/acs.jafc.2c04820] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
β-Methoxyacrylate derivatives represent a new class of pesticides, which have attracted increasing attention owing to their unique structure, broad biological activity, and unique mechanisms of action. They inhibit mitochondrial respiration via preventing electron transfer at the Qo site of the cytochrome bc1 complex and thus are identified as cyt bc1 inhibitors. A variety of β-methoxyacrylate derivatives have been reported by many research groups for discovery of novel pesticides with improved expected activities. This review focuses on development of β-methoxyacrylate derivatives with great significance as pesticides such as fungicides, acaricides, insecticides, herbicides, and antiviral agents. In addition, the structure-activity relationships (SARs) of β-methoxyacrylate derivatives are summarized. Moreover, the cause of resistance to β-methoxyacrylate fungicides and some solutions are also introduced. Finally, the development trend of β-methoxyacrylate derivatives as pesticides is explored. We hope the review will give a guide to develop novel β-methoxyacrylate pesticides in the future.
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Affiliation(s)
- Bo Luo
- College of Life Sciences, Tea Plant Biology Key Laboratory of Henan Province, Xinyang Normal University, Xinyang 464000, China
| | - Yuli Ning
- College of Life Sciences, Tea Plant Biology Key Laboratory of Henan Province, Xinyang Normal University, Xinyang 464000, China
| | - Benqiang Rao
- College of Life Sciences, Tea Plant Biology Key Laboratory of Henan Province, Xinyang Normal University, Xinyang 464000, China
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Luo B, Ning Y. Comprehensive Overview of Carboxamide Derivatives as Succinate Dehydrogenase Inhibitors. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:957-975. [PMID: 35041423 DOI: 10.1021/acs.jafc.1c06654] [Citation(s) in RCA: 54] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Up to now, a total of 24 succinate dehydrogenase inhibitors (SDHIs) fungicides have been commercialized, and SDHIs fungicides were also one of the most active fungicides developed in recent years. Carboxamide derivatives represented an important class of SDHIs with broad spectrum of antifungal activities. In this review, the development of carboxamide derivatives as SDHIs with great significances were summarized. In addition, the structure-activity relationships (SARs) of antifungal activities of carboxamide derivatives as SDHIs was also summarized based on the analysis of the structures of the commercial SDHIs and lead compounds. Moreover, the cause of resistance of SDHIs and some solutions were also introduced. Finally, the development trend of SDHIs fungicides was prospected. We hope this review will give a guide for the development of novel SDHIs fungicides in the future.
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Affiliation(s)
- Bo Luo
- College of Life Sciences, Xinyang Normal University, Tea Plant Biology Key Laboratory of Henan Province, Xinyang 464000, China
| | - Yuli Ning
- College of Life Sciences, Xinyang Normal University, Tea Plant Biology Key Laboratory of Henan Province, Xinyang 464000, China
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Ahsan T, Liu H, Shan YH, Zhou T, Ahmed M, Li B, Wu Y. Identification and bio-control activity of Streptomyces strain (Koyanogensis) against Magnaporthe grisea. BIOTECHNOL BIOTEC EQ 2022. [DOI: 10.1080/13102818.2022.2026816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Taswar Ahsan
- Department of Resources and Environmental Microbiology, College of Land and Environment, Shenyang Agricultural University, Shenyang, PR China
| | - He Liu
- Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, Shenyang, PR China
| | - Yu hang Shan
- Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, Shenyang, PR China
| | - Tao Zhou
- Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, Shenyang, PR China
| | - Maqsood Ahmed
- Department of Agriculture (Plant Protection) Pest Warning and Quality Control of Pesticides, Gujrat, Pakistan
| | - Bingxue Li
- Department of Resources and Environmental Microbiology, College of Land and Environment, Shenyang Agricultural University, Shenyang, PR China
| | - Yuanhua Wu
- Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, Shenyang, PR China
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