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

András Sáhó, Viktor Karikás, Balázs Ásványi, Erika Lakatos, László Varga () and Babett Greff
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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
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

Agriculture, 2024, vol. 14, issue 10, 1-16

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.

Keywords: actinobacteria; Melissa officinalis; Lavandula angustifolia; Origanum vulgare; rhizosphere; bioinoculant (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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