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Bioactive Potential of Actinobacteria Strains Isolated from the Rhizosphere of Lavender, Lemon Balm, and Oregano

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  • András Sáhó

    (Wittmann Antal Multidisciplinary Doctoral School of Plant, Animal, and Food Sciences, Széchenyi István University, 2 Vár Square, 9200 Mosonmagyaróvár, Hungary
    Kisalföldi Agricultural Ltd., 1 Fő Street, 9072 Nagyszentjános, Hungary)

  • Viktor Karikás

    (Department of Food Science, Széchenyi István University, 15-17 Lucsony Street, 9200 Mosonmagyaróvár, Hungary)

  • Balázs Ásványi

    (Department of Food Science, Széchenyi István University, 15-17 Lucsony Street, 9200 Mosonmagyaróvár, Hungary)

  • Erika Lakatos

    (Department of Food Science, Széchenyi István University, 15-17 Lucsony Street, 9200 Mosonmagyaróvár, Hungary)

  • László Varga

    (Department of Food Science, Széchenyi István University, 15-17 Lucsony Street, 9200 Mosonmagyaróvár, Hungary)

  • Babett Greff

    (Department of Food Science, Széchenyi István University, 15-17 Lucsony Street, 9200 Mosonmagyaróvár, Hungary)

Abstract

The objective of this study was to isolate and characterize actinobacteria from the rhizosphere of medicinal and aromatic plants, specifically lavender ( Lavandula angustifolia Mill.), lemon balm ( Melissa officinalis L.), and oregano ( Origanum vulgare L.). Rhizospheric soil samples revealed a high abundance of culturable actinobacteria (6.97–7.23 log 10 CFU/g). Six isolates were selected for their promising enzymatic activities (lignin peroxidase, carboxymethyl cellulase) and antimicrobial properties. Isolates M345 and M162 exhibited the highest cellulase activity indices (3.19 ± 0.71 and 2.54 ± 0.22, respectively), with five isolates producing lignin peroxidase. These actinobacteria also demonstrated plant growth-promoting traits such as phosphate solubilization and nitrogen fixation, along with strong antimicrobial activity against Gram-negative bacteria and phytopathogenic fungi. Additionally, they significantly enhanced maize seed germination, increasing the vigor index from 4283.33 ± 1264.37 to 6248.28 ± 1661.94 compared to that of the control. These results indicate that the isolated actinobacteria strains hold potential as microbial inoculants for sustainable agriculture, contributing to soil health, plant growth, and pathogen management.

Suggested Citation

  • András Sáhó & Viktor Karikás & Balázs Ásványi & Erika Lakatos & László Varga & Babett Greff, 2024. "Bioactive Potential of Actinobacteria Strains Isolated from the Rhizosphere of Lavender, Lemon Balm, and Oregano," Agriculture, MDPI, vol. 14(10), pages 1-16, October.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:10:p:1758-:d:1492613
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    References listed on IDEAS

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    1. Dhuha Sulaiman Salim Al-Daghari & Abdullah Mohammed Al-Sadi & Issa Hashil Al-Mahmooli & Rhonda Janke & Rethinasamy Velazhahan, 2023. "Biological Control Efficacy of Indigenous Antagonistic Bacteria Isolated from the Rhizosphere of Cabbage Grown in Biofumigated Soil against Pythium aphanidermatum Damping-Off of Cucumber," Agriculture, MDPI, vol. 13(3), pages 1-20, March.
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