Colloidal Silver Hydrogen Peroxide: New Generation Molecule for Management of Phytopathogens

Plant pathogenic fungi and bacteria are a significant threat to global commercial crop production resulting in increased cost of production, reduced crop establishment and productivity. An effort was made to study the antimicrobial activity of silver hydrogen peroxide (SHP) against selected plant pathogenic fungi and bacteria under in vitro conditions. Higher antibacterial activity of SHP was observed against Xanthomonas axonopodis pv. citri (Xac; 39.67 mm), Xanthomonas citri pv. punicae (Xap; 39.00 mm), and Ralstonia solanacearum (Rs; 36.67 mm) at 500 ppm concentration. SHP was superior to streptocycline (500 ppm) against Xac (25.33 mm) and Xcp (22.67 mm) at 100 ppm. The soil-borne fungi viz., Pythium aphanidermatum and Fusarium solani failed to initiate mycelium growth on PDA at the concentration of 5000 ppm and above. The average size of SHP particles was 462 nm in diameter, and 73.40% of particles had the size of 378 nm, which reflects the particles present in SHP solution in the form of colloids. The effective doses (100–5000 ppm) did not show any phytotoxicity symptoms in plants, while leaf necrosis was noticed at 10,000 ppm after four days of application. SHP (≤5000 ppm) can be used to effectively manage both fungal and bacterial plant pathogens by a single application. Further field studies need to be conducted for validation and commercial use of SHP.

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Antifungal activity of saponins originated from Medicago hybrida against some ornamental plant pathogens

Acta Agrobotanica ◽

10.5586/aa.2006.061 ◽

2012 ◽

Vol 59 (2) ◽

pp. 51-58 ◽

Cited By ~ 9

Author(s):

Alicja Saniewska ◽

Anna Jarecka ◽

Zbigniew Biały ◽

Marian Jurzysta

Keyword(s):

Antifungal Activity ◽

Fusarium Oxysporum ◽

Botrytis Cinerea ◽

Plant Pathogens ◽

Pathogenic Fungi ◽

Ornamental Plant ◽

Mycelium Growth ◽

Medicagenic Acid ◽

Fungitoxic Effect

Antifungal activity of total saponins originated from roots of Medicago hybrida (Pourret) Trautv. were evaluated in vitro against six pathogenic fungi and eight individual major saponin glycosides were tested against one of the most susceptible fungi. The total saponins showed fungitoxic effect at all investigated concentrations (0.01%, 0.05% and 0.1%) but their potency was different for individual fungi. The highest saponin concentration (0.1%) was the most effective and the inhibition of Fusarium oxysporum f. sp. callistephi, Botrytis cinerea, Botrytis tulipae, Phoma narcissi, Fusarium oxysporum f. sp. narcissi was 84.4%, 69.9%, 68.6%, 57.2%, 55.0%, respectively. While Fusarium oxysporum Schlecht., a pathogen of Muscari armeniacum, was inhibited by 9.5% only. Eight major saponin glycosides isolated from the total saponins of M. hybrida roots were tested against the mycelium growth of Botrytis tulipae. The mycelium growth of the pathogen was greatly inhibited by hederagenin 3-O-β-D-glucopyranoside and medicagenic acid 3-O-β-D-glucopyranoside. Medicagenic acid 3-O-β-D-glucuronopyranosyl-28-O-β-D-glucopyranoside and oleanolic acid 3-O-[β-D-glucuronopyranosyl(1→2)-α-L-galactopyranosyl]-28-O-β-D-glucopyranoside showed low fungitoxic activity. Medicagenic acid 3-O-a-D-glucopyranosyl- 28-O-β-D-glucopyranoside, hederagenin 3-O-[α-L- hamnopyranosyl(1→2)-β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl]- 28-O-α-D-glucopyranoside and hederagenin 3-O-β-D-glucuronopyranosyl-28-O-β-D- lucopyranoside did not limit or only slightly inhibited growth of the tested pathogen. While 2β, 3β-dihydroxyolean-12 ene-23-al-28-oic acid 3-O-β-D-glucuronopyranosyl-28-O-β-D-glucopyranoside slightly stimulated mycelium growth of B. tulipae.

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ANTAGONISTIC TEST OF RIAU LOCAL FUNGAL ISOLATES AGAINST SOME PATHOGENIC IN CULTIVATED PLANTS

AL-Kauniyah Jurnal Biologi ◽

10.15408/kauniyah.v12i2.8730 ◽

2019 ◽

Vol 12 (2) ◽

pp. 124-132

Author(s):

Nia Safitri ◽

Atria Martina ◽

Rodesia Mustika Roza

Keyword(s):

Fusarium Oxysporum ◽

Crop Production ◽

Plant Pathogens ◽

Pathogenic Fungi ◽

Culture Method ◽

Antagonistic Activity ◽

Cultivated Plants ◽

Dual Culture ◽

Trichoderma Sp

Tanaman budi daya merupakan tanaman yang sering diserang oleh cendawan pathogen, sehingga mengakibatkan penurunan populasi dan produksi tanaman. Pengendalian hayati dengan cendawan antagonis merupakan salah satu metode yang paling efektif dan lebih ramah lingkungan dalam menekan pertumbuhan patogen tanaman. Penelitian ini bertujuan untuk menguji aktivitas antagonis cendawan isolat lokal Riau terhadap beberapa cendawan patogen pada tanaman budi daya. Uji antagonis dilakukan secara in vitro dengan metode dual culture menggunakan lima belas cendawan isolat lokal Riau terhadap Fusarium oxysporum f.sp. lycopersici, Ganoderma philippii, G. boninense, Rigidoporus microporus dan Colletotrichum sansevieria. Hasil penelitian menunjukkan bahwa Trichoderma sp. PNE 4 memiliki aktivitas antagonis tertinggi dan isolat FER C1 serta isolat LLB07 hanya memiliki aktivitas antagonis yang tinggi dalam menekan pertumbuhan cendawan patogen. Trichoderma sp. PNE 4 mampu menghambat pertumbuhan miselium F. oxysporum sebesar 85,30%, G. Philippii (100%), G. boninense (100%), dan C. sansevieria (100%). Isolat FER C1 hanya menghambat R. Microporus (50,39%) dan isolat LLB07 menghambat G. philippii (52,20%). Trichoderma sp. PNE 4 merupakan cendawan uji yang terpilih sebagai cendawan antagonis, karena memiliki kemampuan daya hambat >70%.Abstract Cultivated plants are often attacked by pathogenic fungi resulting in a decline of population and crop production. Biocontrol with antagonistic fungi is one of the most effective and environmentally friendly methods in suppressing the growth of plant pathogens. This study aims to examine the antagonistic activity of local isolates fungi Riau against some pathogenic fungi on cultivated plants. The antagonistic test was performed in vitro by dual culture method using fifteen local isolates fungal Riau against Fusarium oxysporum f.sp. lycopersici, Ganoderma philippii, G. boninense, Rigidoporus microporus and Colletotrichum sansevieria. The results showed that Trichoderma sp. PNE 4 isolate exhibited highest activites and FER C1 and LLB07 isolates exhibited high activities suppressed the growth of the fungal pathogen. Trichoderma sp. PNE 4 isolate inhibited mycelial growth F. oxysporum (85.30%), G. philippii (100%), G. boninense (100%) and C. sansevieria (100%). FER C1 isolate only inhibited R. microporus (50.39%), and LLB07 isolate inhibited G. philippii (52.20%). Trichoderma sp. PNE 4 isolate is test isolates as fungal antagonistic.

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Studying the Ability of Thymol to Improve Fungicidal Effects of Tebuconazole and Difenoconazole Against Some Plant Pathogenic Fungi in Seed or Foliar Treatments

Frontiers in Microbiology ◽

10.3389/fmicb.2021.629429 ◽

2021 ◽

Vol 12 ◽

Cited By ~ 1

Author(s):

Larisa Shcherbakova ◽

Oleg Mikityuk ◽

Lenara Arslanova ◽

Alexander Stakheev ◽

Denis Erokhin ◽

...

Keyword(s):

Root Rot ◽

Plant Pathogens ◽

Disease Incidence ◽

Membrane Integrity ◽

Pathogenic Fungi ◽

Bipolaris Sorokiniana ◽

Ergosterol Biosynthesis ◽

Plant Pathogenic Fungi ◽

Wheat Seedlings

Thymol, a secondary plant metabolite possessing antifungal and chemosensitizing activities, disrupts cell wall or membrane integrity and interferes with ergosterol biosynthesis. Thymol also functions as a redox-active compound inducing generation of reactive oxygen species and lipid peroxidation in fungal cells. Previously, we showed thymol significantly enhanced the in vitro growth inhibitory effect of difenoconazole against Bipolaris sorokiniana and Parastagonospora nodorum. More recently, we demonstrated a possibility to use thymol to overcome the resistance of a P. nodorum strain able to grow on difenoconazole-containing media. However, potential for thymol to serve as a chemosensitizing agent in seed or plant treatments, to provide an effective suppression of the above-mentioned plant pathogens by triazole fungicides applied in lowered dosages, had yet to be tested. In the work presented here, we showed combined treatments of naturally infected barley seeds with thymol and difenoconazole (Dividend® 030 FS) synergistically exacerbated the protective effect against common root rot agent, B. sorokiniana, and other fungi (Fusarium spp. and Alternaria spp.). Similarly, co-applied treatment of wheat seeds, artificially inoculated with Fusarium culmorum, resulted in equivalent reduction of disease incidence on barley seedlings as application of Dividend®, alone, at a ten-fold higher dosage. In foliar treatments of wheat seedlings, thymol combined with Folicur® 250 EC (a.i. tebuconazole) enhanced sensitivity of P. nodorum, a glume/leaf blotch pathogen, to the fungicide and provided a significant mitigation of disease severity on treated seedlings, compared to controls, without increasing Folicur® dosages. Folicur® co-applied with thymol was also significantly more effective against a strain of P. nodorum tolerant to Folicur® alone. No additional deoxynivalenol or zearalenone production was found when a toxigenic F. culmorum was cultured in a nutrient medium containing thymol at a concentration used for chemosensitization of root rot agents. Accordingly, F. culmorum exposure to thymol at the sensitizing concentration did not up-regulate key genes associated with the biosynthesis of trichothecene or polyketide mycotoxins in this pathogen. Further studies using field trials are necessary to determine if thymol-triazole co-applications result in sensitization of seed- and foliar-associated plant pathogenic fungi, and if thymol affects production of fusarial toxins under field conditions.

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Soil Chitinolytic Bacteria from Jambi Province to Produce Antifungal of Plant Pathogens

Mangifera Edu ◽

10.31943/mangiferaedu.v5i1.95 ◽

2020 ◽

Vol 5 (1) ◽

pp. 26-37

Author(s):

Risky Hadi Wibowo ◽

Sipriyadi Sipriyadi ◽

Nisa Rachmania Mubarik ◽

Iman Rusmana

Keyword(s):

Plant Pathogens ◽

Biological Control Agent ◽

Sclerotium Rolfsii ◽

Morphological Characteristics ◽

Pathogenic Fungi ◽

Plant Pathogenic Fungi ◽

Fungal Cell ◽

Chitinolytic Bacteria ◽

Agar Media

Chitinolytic bacteria are bacteria that have chitinolytic activity, which is able to hydrolysis the composition of chitin which composes many fungal cell walls. Chitinolytic bacteria are currently more widely used because of their ability as a biological control agent to the pathogenic fungi especially in horticultural and plantation crops. This research was conducted with the aim of obtaining isolates of chitinolytic bacteria that were able to inhibit the growth of plant pathogenic fungi in Vitro on chitin agar media. Fusarium oxysporum, Sclerotium rolfsii, and Rhizoctonia solanii are used in the inhibition test of chitinolytic bacteria. Bacteria were isolated and screened from the soil of Bukit Dua Belas National Park and Oil Palm Plantations in Jambi using 0.3% chitin agar media. The results showed that two of 10 bacterial isolates were able to produce inhibition zones to the growth of hyphae of pathogenic fungi on potato dextrose agar (PDA) media. TB04-13 isolate was able to produce the largest inhibition in F. oxysporum and R. solanii about 42% and 42.05% respectively, while TB04-15 isolate produced the biggest inhibition in S. Rolfsii ranged to 25.50%. Based on the chitinolytic index (CI) values, isolates TB04-13 and TB04-15 produced CI values of 1.60 and 0.63, respectively. The morphological characteristics and Gram staining of both TB04-13 and TB04-15 chitinolytic isolates are included in rod-shaped and Gram-positive bacteria. Both of these isolates can be used as antifungal-producing candidates for plant pathogenic fungi in Indonesia.

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Hevein-Like Antimicrobial Peptides Wamps: Structure–Function Relationship in Antifungal Activity and Sensitization of Plant Pathogenic Fungi to Tebuconazole by WAMP-2-Derived Peptides

International Journal of Molecular Sciences ◽

10.3390/ijms21217912 ◽

2020 ◽

Vol 21 (21) ◽

pp. 7912 ◽

Cited By ~ 3

Author(s):

Tatyana Odintsova ◽

Larisa Shcherbakova ◽

Marina Slezina ◽

Tatyana Pasechnik ◽

Bakhyt Kartabaeva ◽

...

Keyword(s):

Antifungal Activity ◽

Antimicrobial Peptides ◽

Structure Function ◽

Spore Germination ◽

Pathogenic Fungi ◽

Plant Pathogenic Fungi ◽

Fungal Cell ◽

Structure Function Relationship ◽

Function Relationship

Hevein-like antimicrobial peptides (AMPs) comprise a family of plant AMPs with antifungal activity, which harbor a chitin-binding site involved in interactions with chitin of fungal cell walls. However, the mode of action of hevein-like AMPs remains poorly understood. This work reports the structure–function relationship in WAMPs—hevein-like AMPs found in wheat (Triticum kiharae Dorof. et Migush.) and later in other Poaceae species. The effect of WAMP homologues differing at position 34 and the antifungal activity of peptide fragments derived from the central, N- and C-terminal regions of one of the WAMPs, namely WAMP-2, on spore germination of different plant pathogenic fungi were studied. Additionally, the ability of WAMP-2-derived peptides to potentiate the fungicidal effect of tebuconazole, one of the triazole fungicides, towards five cereal-damaging fungi was explored in vitro by co-application of WAMP-2 fragments with Folicur® EC 250 (25% tebuconazole). The antifungal activity of WAMP homologues and WAMP-2-derived peptides varied depending on the fungus, suggesting multiple modes of action for WAMPs against diverse pathogens. Folicur® combined with the WAMP-2 fragments inhibited the spore germination at a much greater level than the fungicide alone, and the type of interactions was either synergistic or additive, depending on the target fungus and concentration combinations of the compounds. The combinations, which resulted in synergism and drastically enhanced the sensitivity to tebuconazole, were revealed for all five fungi by a checkerboard assay. The ability to synergistically interact with a fungicide and exacerbate the sensitivity of plant pathogenic fungi to a commercial antifungal agent is a novel and previously uninvestigated property of hevein-like AMPs.

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Survival and probability of transmission of plant pathogenic fungi through the digestive tract of honey bee workers

Apidologie ◽

10.1007/s13592-019-00697-6 ◽

2019 ◽

Vol 50 (6) ◽

pp. 871-880 ◽

Cited By ~ 1

Author(s):

Jorgiane B. Parish ◽

Eileen S. Scott ◽

Raymond Correll ◽

Katja Hogendoorn

Keyword(s):

Digestive Tract ◽

Honey Bee ◽

Honey Bees ◽

Plant Pathogens ◽

Fungal Spores ◽

Pathogenic Fungi ◽

Colletotrichum Acutatum ◽

Plant Pathogenic Fungi ◽

The Mean ◽

Honey Bee Workers

AbstractHoney bees, Apis mellifera, have been implicated as vectors of plant pathogens. However, the survival of spores of plant pathogenic fungi through the digestive tract of workers has not been investigated. As workers defecate outside the hive, transport of hives could give rise to biosecurity concerns if fungal spores remain viable following passage through the digestive tract. To determine the likelihood that honey bees serve as vectors, this study investigated the viability of spores of Botrytis cinerea and Colletotrichum acutatum after passing through the digestive tract of summer and autumn worker bees. For both fungi, the mean viability of spores in faeces suspensions was less than one percent of the initial dose fed to the bees. Although survival was low, the large number of workers per hive implies a high probability of transmission of viable spores through honey bee faeces. Hence, in the case of economically important fungal diseases, transported hives could be a source of inoculum and quarantine restrictions should be considered.

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Antifungal activity in vitro of propolis solutions from Argentina against two plant pathogenic fungi: Didymella bryoniae and Rhizotocnia solani

Journal of Apicultural Research ◽

10.3896/ibra.1.53.4.08 ◽

2014 ◽

Vol 53 (4) ◽

pp. 438-440

Author(s):

Liliana Gallez ◽

Mirta Kiehr ◽

Leticia Fernández ◽

Rolf Delhey ◽

Débora Stikar

Keyword(s):

Antifungal Activity ◽

Pathogenic Fungi ◽

Plant Pathogenic Fungi ◽

Didymella Bryoniae

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Antifungal Activity of Silver Ions and Nanoparticles on Phytopathogenic Fungi

Plant Disease ◽

10.1094/pdis-93-10-1037 ◽

2009 ◽

Vol 93 (10) ◽

pp. 1037-1043 ◽

Cited By ~ 322

Author(s):

Young-Ki Jo ◽

Byung H. Kim ◽

Geunhwa Jung

Keyword(s):

Antifungal Activity ◽

Colony Formation ◽

Magnaporthe Grisea ◽

Silver Ions ◽

Pathogenic Fungi ◽

Chloride Ions ◽

Plant Diseases ◽

Plant Pathogenic Fungi ◽

In Planta

Silver in ionic or nanoparticle forms has a high antimicrobial activity and is therefore widely used for various sterilization purposes including materials of medical devices and water sanitization. There have been relatively few studies on the applicability of silver to control plant diseases. Various forms of silver ions and nanoparticles were tested in the current study to examine the antifungal activity on two plant-pathogenic fungi, Bipolaris sorokiniana and Magnaporthe grisea. In vitro petri dish assays indicated that silver ions and nanoparticles had a significant effect on the colony formation of these two pathogens. Effective concentrations of the silver compounds inhibiting colony formation by 50% (EC50) were higher for B. sorokiniana than for M. grisea. The inhibitory effect on colony formation significantly diminished after silver cations were neutralized with chloride ions. Growth chamber inoculation assays further confirmed that both ionic and nanoparticle silver significantly reduced these two fungal diseases on perennial ryegrass (Lolium perenne). Particularly, silver ions and nanoparticles effectively reduced disease severity with an application at 3 h before spore inoculation, but their efficacy significantly diminished when applied at 24 h after inoculation. The in vitro and in planta evaluations of silver indicated that both silver ions and nanoparticles influence colony formation of spores and disease progress of plant-pathogenic fungi. In planta efficacy of silver ions and nanoparticles is much greater with preventative application, which may promote the direct contact of silver with spores and germ tubes, and inhibit their viability.

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Activity of Armillarisin B in vitro against Plant Pathogenic Fungi

Zeitschrift für Naturforschung C ◽

10.1515/znc-2009-11-1206 ◽

2009 ◽

Vol 64 (11-12) ◽

pp. 790-792 ◽

Cited By ~ 2

Author(s):

Jin-Wen Shen ◽

Bing-Ji Ma ◽

Wen Li ◽

Hai-You Yu ◽

Ting-Ting Wu ◽

...

Keyword(s):

Antifungal Activity ◽

Methanolic Extract ◽

Pathogenic Fungi ◽

2D Nmr ◽

Spectroscopic Studies ◽

Gibberella Zeae ◽

Plant Pathogenic Fungi ◽

Fruiting Bodies ◽

Bioassay Guided Fractionation

The methanolic extract of the fruiting bodies of the mushroom Armillariella tabescens was found to show antifungal activity against Gibberella zeae. The active compound was isolated from the fruiting bodies of A. tabescens by bioassay-guided fractionation of the extract and identifi ed as armillarisin B. Armillarisin B eventually corresponds to 2-hydroxy-2- phenylpropanediamide and its structure was confi rmed on the basis of spectroscopic studies including 2D NMR experiments.

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