Sexual reproduction as the cause of heat resistance in the food spoilage fungus Byssochlamys spectabilis (anamorph Paecilomyces variotii)

Applied and Environmental Microbiology
Jos A M P HoubrakenR A Samson

Abstract

Paecilomyces variotii is a common cosmopolitan species that is able to spoil various food- and feedstuffs and is frequently encountered in heat-treated products. However, isolates from heat-treated products rarely form ascospores. In this study we examined by using molecular techniques and mating tests whether this species can undergo a sexual cycle and form ascospores. The population structure of this species was examined by analyzing the nuclear ribosomal internal transcribed spacer 1 (ITS1) and ITS2 and the 5.8S rRNA gene, as well as partial beta-tubulin, actin, and calmodulin gene sequences. Phylogenetic analyses revealed that P. variotii is a highly variable species. Partition homogeneity tests revealed that P. variotii has a recombining population structure. In addition to sequence analyses, mating experiments indicated that P. variotii is able to form ascomata and ascospores in culture in a heterothallic manner. The distribution of MAT1-1 and MAT1-2 genes showed a 1:1 ratio in the progeny of the mating experiments. From the sequence analyses and mating data we conclude that P. variotii is the anamorph of Talaromyces spectabilis and that it has a biallelic heterothallic mating system. Since Paecilomyces sensu stricto anam...Continue Reading

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Citations

Mar 4, 2009·Medical Mycology·R A Samson, J Varga
Apr 15, 2011·Biological Reviews of the Cambridge Philosophical Society·Sylvain BilliardTatiana Giraud
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Jul 16, 2019·Fungal biology and biotechnology·Andrew S UrquhartAlexander Idnurm
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Jul 6, 2021·Frontiers in Microbiology·Luigi OrrùFlavia Pinzari
Aug 6, 2021·Journal of Natural Products·Emma K DavisonMargaret A Brimble

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