Argovin, a novel natural product secreted by the fungus Meira argovae, is antagonistic to mites

Paz, Zahi; Bilkis, Itzhak; Gerson, U.; Kerem, Zohar; Sztejnberg, A.

doi:10.1111/j.1570-7458.2011.01155.x

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…thompsonii have been used to reduce mite infestations. Meira spp., mainly Meira geulakonigii , have been identified as plant endophytes that reduce mite populations not by direct colonization, but through the production of toxic metabolites such as argovin [ 36 , 39 ]. In regard to the bulb mite, previous studies have evaluated its susceptibility to entomopathogenic fungi, including Hirsutella spp., Isaria fumosorosea, Metarhizium spp., and entomopathogenic nematodes [ 40 , 41 , 42 ]; but only one strain of a Metarhizium sp.…”

Section: Discussionmentioning

confidence: 99%

Interactions of Metarhizium brunneum-7 with Phytophagous Mites Following Different Application Strategies

Ment

Sukirtha

Gal

et al. 2020

Insects

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Metarhizium brunneum is a generalist entomopathogenic fungus known to be virulent against Acari. We investigated Metarhizium brunneum-7 (Mb7) interactions in three systems of phytophagous mites and their respective plant hosts: Volkamer lemon (Citrus volkameriana) and the citrus rust mite Phyllocoptruta oleivora; common bean (Phaseolus vulgaris) and the two-spotted spider mite Tetranychus urticae; and spring onion (Allium cepa) and the bulb mite Rhizoglyphus robini. All three mite species were susceptible to directly applied Mb7 conidia. Results obtained using the standard method for studying endophytic colonization vs. live confocal imaging of plant tissues using the green fluorescent protein (GFP)-transformed fungus differed markedly, demonstrating that microscopy validation was more definite than the standard process of recovery from plant tissue. Endophytic colonization was observed in conidium-infiltrated citrus leaves and in roots of onion plants treated with soil-drenched conidia, but not in common bean treated by either spray or drench of conidia. Endophytic colonization of citrus leaves did not affect the citrus mite population. Drench application in common bean reduced two-spotted mite population. Similarly, drench application in onion reduced bulb mite population. This study emphasizes the importance of the host plant effects on Mb7 control efficacy of mite pests, and the merits of live-imaging techniques in studying endophytic interaction.

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Section: Discussionmentioning

confidence: 99%

Interactions of Metarhizium brunneum-7 with Phytophagous Mites Following Different Application Strategies

Ment

Sukirtha

Gal

et al. 2020

Insects

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“…Meira argovae is a basidiomycetous anamorphic yeast-like fungus belonging to class Ustilaginomycetes and has been reported to be associated with phytophagous mites (26) in bamboo shoots (27) . Meira argovae may have potential for controlling these mites in important crops because it secretes antagonistic substances (28) . M. argovae was isolated from a beetle collected in a bee brood comb of a colony, therefore, the acquisition of this yeast by the SHB adult may have been occurred when the beetle walked through brood combs.…”

Section: Discussionmentioning

confidence: 99%

Presencia de la levadura Kodamaea ohmeri en escarabajos Aethina tumida (Coleoptera: Nitidulidae) colectados de colonias de abeja melífera africanizada en dos apiarios en Yucatán, México

Canto

Medina-Medina

Chan

et al. 2020

Rev. Mex. Cienc. Pecu.

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Aethina tumida (Coleoptera: Nitidulidae), commonly known as the Small Hive Beetle (SHB), is becoming a significant pest in the beekeeping industry outside of its natural distribution range. In Mexico, recent reports indicate that the SHB is distributed throughout the Yucatan peninsula. The invasion of honey bee colonies by SHB it is mainly chemically mediated by volatiles produced by the yeast Kodamaea ohmeri which is regarded as a secondary symbiont of the SHB. It was analyzed the presence of this yeast in honey bee colonies of Yucatan based on the premise that symbionts are often conjointly distributed with their hosts, therefore the presence of K. ohmeri in hives will be closely associated with the presence of SHB. In managed Africanized honey bee (AHB) colonies, yeasts associated with adult beetles were isolated and identified and the results show that the SHB together with their associated yeast, K. ohmeri, have invaded AHB colonies in Yucatan. It was also reported the presence of yeasts other than K. ohmeri associated with SHB that for the first time are recorded in a geographical region where they had not been recorded before.

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“…All ethyl acetate extracts were loaded onto a C18 column in a 20-µL injection volume. Elution was performed using a linear gradient consisting of double distilled water and acetonitrile; an isocratic step was initially carried out for 3 min at 85% water, followed by a moderate increase in acetonitrile to reach 100% in 20min, at a flow rate of 1mL/min [ 42 ]. The second isocratic step was carried out for 5 min with 100% acetonitrile.…”

Section: Methodsmentioning

confidence: 99%

Insecticidal Activity of Ethyl Acetate Extracts from Culture Filtrates of Mangrove Fungal Endophytes

et al. 2015

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In the search for novel potent fungi-derived bioactive compounds for bioinsecticide applications, crude ethyl acetate culture filtrate extracts from 110 mangrove fungal endophytes were screened for their toxicity. Toxicity tests of all extracts against brine shrimp (Artemia salina) larvae were performed. The extracts with the highest toxicity were further examined for insecticidal activity against Spodoptera litura larvae and acetylcholinesterase (AChE) inhibition activity. The results showed that the extracts of five isolates exhibited the highest toxicity to brine shrimp at 50% lethal concentration (LC50) values of 7.45 to 10.24 ppm. These five fungal isolates that obtained from Rhizophora mucronata were identified based on sequence data analysis of the internal transcribed spacer region of rDNA as Aspergillus oryzae (strain BPPTCC 6036), Emericella nidulans (strains BPPTCC 6035 and BPPTCC 6038), A. tamarii (strain BPPTCC 6037), and A. versicolor (strain BPPTCC 6039). The mean percentage of S. litura larval mortality following topical application of the five extracts ranged from 16.7% to 43.3%. In the AChE inhibition assay, the inhibition rates of the five extracts ranged from 40.7% to 48.9%, while eserine (positive control) had an inhibition rate of 96.8%, at a concentration of 100 ppm. The extracts used were crude extracts, so their potential as sources of AChE inhibition compounds makes them likely candidates as neurotoxins. The high-performance liquid chromatography profiles of the five extracts differed, indicating variations in their chemical constituents. This study highlights the potential of culture filtrate ethyl acetate extracts of mangrove fungal endophytes as a source of new potential bioactive compounds for bioinsecticide applications.

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Argovin, a novel natural product secreted by the fungus Meira argovae, is antagonistic to mites

Cited by 9 publications

References 23 publications

Interactions of Metarhizium brunneum-7 with Phytophagous Mites Following Different Application Strategies

Interactions of Metarhizium brunneum-7 with Phytophagous Mites Following Different Application Strategies

Presencia de la levadura Kodamaea ohmeri en escarabajos Aethina tumida (Coleoptera: Nitidulidae) colectados de colonias de abeja melífera africanizada en dos apiarios en Yucatán, México

Insecticidal Activity of Ethyl Acetate Extracts from Culture Filtrates of Mangrove Fungal Endophytes

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