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Open AccessArticle

Light-Irradiation Wavelength and Intensity Changes Influence Aflatoxin Synthesis in Fungi

Division of Food Biotechnology, Food Research Institute, NARO, 2-1-12 Kannon-dai, Tsukuba, Ibaraki 305-8642, Japan
Toxins 2018, 10(1), 31;
Received: 8 December 2017 / Revised: 25 December 2017 / Accepted: 3 January 2018 / Published: 5 January 2018
(This article belongs to the Collection Aflatoxins)
PDF [5076 KB, uploaded 8 January 2018]


Fungi respond to light irradiation by forming conidia and occasionally synthesizing mycotoxins. Several light wavelengths, such as blue and red, affect the latter. However, the relationship between light irradiation and mycotoxin synthesis varies depending on the fungal species or strain. This study focused on aflatoxin (AF), which is a mycotoxin, and the types of light irradiation that increase AF synthesis. Light-irradiation tests using the visible region indicated that blue wavelengths in the lower 500 nm region promoted AF synthesis. In contrast, red wavelengths of 660 nm resulted in limited significant changes compared with dark conditions. Irradiation tests with different intensity levels indicated that a low light intensity increased AF synthesis. For one fungal strain, light irradiation decreased the AF synthesis under all wavelength conditions. However, the decrease was mitigated by 525 nm low intensity irradiation. Thus, blue-green low intensity irradiation may increase AF synthesis in fungi. View Full-Text
Keywords: light wavelength; intensity; aflatoxin; mycotoxin light wavelength; intensity; aflatoxin; mycotoxin

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Suzuki, T. Light-Irradiation Wavelength and Intensity Changes Influence Aflatoxin Synthesis in Fungi. Toxins 2018, 10, 31.

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