ethylene (as a natural biologically active compound) was found to inhibit aflatoxin production by Aspergillus parasiticus. It was suggested that ethylene modulates mycotoxin biosynthesis by the microfungi via an ethylene sensor.
See reference and attachment
Roze LV, Calvo AM, Gunterus A, Beaudry R, Kall M, Linz JE. Ethylene modulates development and Toxin biosynthesis in Aspergillus possibly via an ethylene sensor-mediated signaling pathway. J Food Prot. 2004;67:438–447.