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Light regulation of mycotoxin biosynthesis: new perspectives for food safety

in World Mycotoxin Journal
Autor:innen:
F. Fanelli Institute of Sciences of Food Production, CNR, via Amendola 122/0, 70126 Bari, Italy

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R. Geisen Department of Safety and Quality of Fruit and Vegetables, Max Rubner-Institut, Haid-und-Neu-Str. 9, 76131 Karlsruhe, Germany

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M. Schmidt-Heydt Department of Safety and Quality of Fruit and Vegetables, Max Rubner-Institut, Haid-und-Neu-Str. 9, 76131 Karlsruhe, Germany

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A.F. Logrieco Institute of Sciences of Food Production, CNR, via Amendola 122/0, 70126 Bari, Italy

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G. Mulè Institute of Sciences of Food Production, CNR, via Amendola 122/0, 70126 Bari, Italy

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Mycotoxins are secondary metabolites produced by toxigenic fungi contaminating foods and feeds in pre-, post-harvest and processing, and represent a great concern worldwide, both for the economic implications and for the health of the consumers. Many environmental conditions are involved in the regulation of mycotoxin biosynthesis. Among these, light represents one of the most important signals for fungi, influencing several physiological responses such as pigmentation, sexual development and asexual conidiation, primary and secondary metabolism, including mycotoxin biosynthesis. In this review we summarise some recent findings on the effect of specific light wavelength and intensity on mycotoxin biosynthesis in the main toxigenic fungal genera. We describe the molecular mechanism underlying light perception and its involvement in the regulation of secondary metabolism, focusing on VeA, global regulator inAspergillus nidulans, and the White-Collar proteins, key components of light response inNeurospora crassa. Light of specific wavelength and intensity exerts different effects both on growth and on toxin production depending on the fungal genus. InPenicillium spp. red (627 nm) and blue wavelengths (455-470 nm) reduce ochratoxin A (OTA) biosynthesis by modulating the level of expression of the ochratoxin polyketide synthase. Furthermore a mutual regulation between citrinin and OTA production is reported inPenicillium toxigenic species. InAspergillus spp. the effect of light treatment is strongly dependent on the species and culture conditions. Royal blue wavelength (455 nm) of high intensity (1,700 Lux) is capable of completely inhibit fungal growth and OTA production inAspergillus stenyii andPenicillum verrucosum. InFusarium spp. the effect of light exposure is less effective; mycotoxin-producing species, such asFusarium verticillioides andFusarium proliferatum, grow better under light conditions, and fumonisin production increased. This review provides a comprehensive picture on light regulation of mycotoxin biosynthesis and discusses possible new applications of this resource in food safety.

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