Antifungal effect of Lamiaceae herb water extracts against Fusarium root rot in Asparagus
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In the current study, the antioxidative and in vitro antifungal properties of ten Lamiaceae herbs were estimated. Based on the results, the in vivo antifungal potential of oregano, sage, hyssop and lemon balm water extracts against Fusarium root rot in asparagus plants was evaluated. Water extracts of several herbs (0.5% and 2%, w/v) showed high DPPH radical scavenging activity, and oregano, sage and lemon balm extracts exhibited considerable suppression of Fusarium oxysporum f. sp. asparagi (Foa) in vitro. Regarding in vivo evaluation, asparagus plants treated with water extracts (20%, w/v) of the selected four herbs were inoculated with Foa. Four weeks after Foa inoculation, lower disease incidence and indices were observed in all the extract-treated plants compared to control. These effects could be attributed to reduced Fusarium population owing to fungistasis induced by the extracts in the rhizospheric soil. Consequently, dry weights of shoots and roots treated with herb extracts were observed to be higher than those in control. Evaluation of caffeic acid and rosmarinic acid as the possible antifungal properties present in the Lamiaceae herbs also showed a suppressive effect on Fusarium population in the in vitro analysis. From these findings, it can be concluded that water extracts of the selected four herbs have high antioxidative properties and antifungal potential against Fusarium oxysporum f. sp. asparagi. In this case, the presence of possible antifungal secondary metabolites such as caffeic and rosmarinic acid in the extracts could be related to this antifungal potential.
KeywordsCaffeic acid Lemon balm Rosmarinic acid Sage Secondary metabolites
This study was supported by Grants-in-Aid for Scientific Research (No. 15K07288) from the Japan Society for the Promotion of Sciences.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
Informed consent was obtained from both participants included in the study. Both authors have seen and approved the manuscript and have taken a valid role through either study design, data generation, or manuscript preparation.
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