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Orchid mycorrhizal fungus from the Brazilian Cerrado exhibits biocontrol activity against Meloidogyne javanica.

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Title: Orchid mycorrhizal fungus from the Brazilian Cerrado exhibits biocontrol activity against Meloidogyne javanica.
Authors: Mendes, Bruno Leonardo1 (AUTHOR) bleomendes@gmail.com, Faria, Denner Robert1 (AUTHOR), Sousa, Kellen Cristhina Inácio2 (AUTHOR), Costa, Matheus Pereira Lima1 (AUTHOR), da Rocha, Mara Rúbia1 (AUTHOR), de Araújo, Leila Garcês3 (AUTHOR)
Source: Mycorrhiza. Dec2025, Vol. 35 Issue 6, p1-12. 12p.
Subject Terms: *Javanese root-knot nematode, *Mycorrhizal fungi, *Cerrados, *Sustainability, *Plant growth, *Root-knot nematodes, *Biological pest control agents, *Biological pest control
Abstract: Waitea circinata, an orchid-associated mycorrhizal fungus, was evaluated for the first time as a biological control agent against the root-knot nematode Meloidogyne javanica. The fungus was originally isolated from the roots of Epidendrum nocturnum, a rupicolous orchid to the Brazilian Cerrado. In vitro assays demonstrated that W. circinata parasitized nematode eggs, with parasitism rates of 13–15% and characteristic emergence of septate hyphae with right-angle branching. Microscopy revealed eggshell degradation, arrested embryogenesis, and juvenile deformation. A mycelial suspension (MSF) of the fungus increased juvenile (J2) mortality in a dose-dependent manner, suggesting the action of nematicidal metabolites. In greenhouse experiments, W. circinata significantly reduced the nematode reproduction factor (RF), with values dropping from above 5 in the control to below 1 at the highest concentrations. In addition, MSF application promoted plant growth, increasing root length, root mass, and shoot height. No phytotoxic effects were observed at any dose. Principal component analysis confirmed a negative correlation between nematode-related variables and plant development, reinforcing the dual action of W. circinata in nematode suppression and plant stimulation. These effects are likely mediated by a combination of mechanisms, including parasitism, enzyme activity, antibiosis, and the production of phytohormones. The results highlight W. circinata as a promising candidate for the sustainable management of plant-parasitic nematodes and the enhancement of crop performance. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 188779547
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Orchid mycorrhizal fungus from the Brazilian Cerrado exhibits biocontrol activity against Meloidogyne javanica.
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  Data: <searchLink fieldCode="AR" term="%22Mendes%2C+Bruno+Leonardo%22">Mendes, Bruno Leonardo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bleomendes@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Faria%2C+Denner+Robert%22">Faria, Denner Robert</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sousa%2C+Kellen+Cristhina+Inácio%22">Sousa, Kellen Cristhina Inácio</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Costa%2C+Matheus+Pereira+Lima%22">Costa, Matheus Pereira Lima</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22da+Rocha%2C+Mara+Rúbia%22">da Rocha, Mara Rúbia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22de+Araújo%2C+Leila+Garcês%22">de Araújo, Leila Garcês</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Mycorrhiza%22">Mycorrhiza</searchLink>. Dec2025, Vol. 35 Issue 6, p1-12. 12p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Javanese+root-knot+nematode%22">Javanese root-knot nematode</searchLink><br />*<searchLink fieldCode="DE" term="%22Mycorrhizal+fungi%22">Mycorrhizal fungi</searchLink><br />*<searchLink fieldCode="DE" term="%22Cerrados%22">Cerrados</searchLink><br />*<searchLink fieldCode="DE" term="%22Sustainability%22">Sustainability</searchLink><br />*<searchLink fieldCode="DE" term="%22Plant+growth%22">Plant growth</searchLink><br />*<searchLink fieldCode="DE" term="%22Root-knot+nematodes%22">Root-knot nematodes</searchLink><br />*<searchLink fieldCode="DE" term="%22Biological+pest+control+agents%22">Biological pest control agents</searchLink><br />*<searchLink fieldCode="DE" term="%22Biological+pest+control%22">Biological pest control</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Waitea circinata, an orchid-associated mycorrhizal fungus, was evaluated for the first time as a biological control agent against the root-knot nematode Meloidogyne javanica. The fungus was originally isolated from the roots of Epidendrum nocturnum, a rupicolous orchid to the Brazilian Cerrado. In vitro assays demonstrated that W. circinata parasitized nematode eggs, with parasitism rates of 13–15% and characteristic emergence of septate hyphae with right-angle branching. Microscopy revealed eggshell degradation, arrested embryogenesis, and juvenile deformation. A mycelial suspension (MSF) of the fungus increased juvenile (J2) mortality in a dose-dependent manner, suggesting the action of nematicidal metabolites. In greenhouse experiments, W. circinata significantly reduced the nematode reproduction factor (RF), with values dropping from above 5 in the control to below 1 at the highest concentrations. In addition, MSF application promoted plant growth, increasing root length, root mass, and shoot height. No phytotoxic effects were observed at any dose. Principal component analysis confirmed a negative correlation between nematode-related variables and plant development, reinforcing the dual action of W. circinata in nematode suppression and plant stimulation. These effects are likely mediated by a combination of mechanisms, including parasitism, enzyme activity, antibiosis, and the production of phytohormones. The results highlight W. circinata as a promising candidate for the sustainable management of plant-parasitic nematodes and the enhancement of crop performance. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s00572-025-01233-4
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Javanese root-knot nematode
        Type: general
      – SubjectFull: Mycorrhizal fungi
        Type: general
      – SubjectFull: Cerrados
        Type: general
      – SubjectFull: Sustainability
        Type: general
      – SubjectFull: Plant growth
        Type: general
      – SubjectFull: Root-knot nematodes
        Type: general
      – SubjectFull: Biological pest control agents
        Type: general
      – SubjectFull: Biological pest control
        Type: general
    Titles:
      – TitleFull: Orchid mycorrhizal fungus from the Brazilian Cerrado exhibits biocontrol activity against Meloidogyne javanica.
        Type: main
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            NameFull: Mendes, Bruno Leonardo
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            NameFull: Faria, Denner Robert
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            NameFull: Sousa, Kellen Cristhina Inácio
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            NameFull: Costa, Matheus Pereira Lima
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            NameFull: da Rocha, Mara Rúbia
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            NameFull: de Araújo, Leila Garcês
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            – D: 01
              M: 12
              Text: Dec2025
              Type: published
              Y: 2025
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              Value: 09406360
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              Value: 35
            – Type: issue
              Value: 6
          Titles:
            – TitleFull: Mycorrhiza
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