Abstract
Contamination of environment and food from the prevalent spores and mycotoxins of Aspergillus niger has led to several diseases in humans and other animals. The present study investigated the control activity of plant essential oils against three strains of A. niger. In the elaborate assays done through microdilution plate assay and agar disk diffusion assay in the lab condition and in vivo assay on the stored wheat grains, the essential oil of Thymus vulgaris depicted overall superior efficacy. In microdilution plate assay, the oil of Anethum graveolens showed best fungistatic activity, while best fungicidal activity was depicted by Syzygium aromaticum oil. The oil of T. vulgaris showed moderate control efficacy against A. niger strains with its antifungal activity resulting mainly due to killing of microorganism rather than growth inhibition. In agar disk diffusion assay, T. vulgaris oil with a zone of inhibition (ZOI) of 23.3–61.1% was the most effective fungicide. The in vivo assay to evaluate the protection efficacy of oils for stored wheat grains against A. niger (AN1) revealed T. vulgaris (90.5–100%) to be the best control agent, followed by the oil of S. aromaticum (61.9–100%). The GC–MS analysis of T. vulgaris oil indicated the presence of thymol (39.11%), γ-terpinene (19.73%), o-cymene (17.21%), and β-pinene (5.38%) as major oil components. Phytotoxic effects of the oils on wheat seeds showed no significant phytotoxic effect of oils in terms of seed germination or seedling growth. The results of the study demonstrated control potentiality of essential oils for the protection of stored wheat against A. niger with prospect for development of eco-friendly antifungal products.
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Acknowledgements
This work was supported by Science and Engineering Research Board, Department of Science and Technology (DST), India (SB/YS/LS-392/2013). The authors acknowledge the technical support provided by Mr. Ajai Kumar (AIRF JNU, India) for GC–MS analysis and Mr. Omkar Sharma (IARI, New Delhi, India) for his help in experimental work.
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Kumar, P., Mishra, S., Kumar, A. et al. In vivo and in vitro control activity of plant essential oils against three strains of Aspergillus niger . Environ Sci Pollut Res 24, 21948–21959 (2017). https://doi.org/10.1007/s11356-017-9730-x
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DOI: https://doi.org/10.1007/s11356-017-9730-x