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DOI: 10.3852/09-011
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Mycologia, 101(3), 2009, pp. 423-429.
© 2009 by The Mycological Society of America

Sexual reproduction in Aspergillus flavus


Bruce W. Horn 1

     National Peanut Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Dawson, Georgia 39842

Geromy G. Moore
Ignazio Carbone

     Center for Integrated Fungal Research, Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina 27695

Aspergillus flavus is the major producer of carcinogenic aflatoxins in crops worldwide and is also an important opportunistic human pathogen in aspergillosis. The sexual state of this heterothallic fungus is described from crosses between strains of the opposite mating type. Sexual reproduction occurred between sexually compatible strains belonging to different vegetative compatibility groups. Multiple, indehiscent ascocarps containing asci and ascospores formed within the pseudoparenchymatous matrix of stromata, which places the fungus in genus Petromyces. The teleomorph of P. flavus could not be distinguished from that of P. parasiticus (anamorph = A. parasiticus), another aflatoxin-producing species, based on morphology of the sexual structures. The two species can be separated by anamorph morphology, mycotoxin profile and molecular characters.

Key words: aflatoxin, Aspergillus alliaceus, Aspergillus parasiticus, heterothallism, Petromyces alliaceus, Petromyces flavus, Petromyces parasiticus, Trichocomaceae

1 Corresponding author. E-mail: bruce.horn{at}ars.usda.gov




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