Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii).

Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii). Research Abstract Details 

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Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii). Abstract Text:

Jos Houbraken, Varga,Emilia Rico-Munoz,Shawn Johnson,Robert A Samson,

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 anamorphs group within Byssochlamys, a new combination Byssochlamys spectabilis is proposed.

Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii). Publishing Authors By Initials

J Houbraken,J Varga,E Rico-Munoz,S Johnson,RA Samson,

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Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii). Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Applied and environmental microbiology

VOLUME: 74

Page Numbers: 1613-9

Journal Abbreviation: Appl. Environ. Microbiol.

ISSN: 1098-5336

DAY: 11

MONTH: 01

YEAR: 2008

Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii). Information

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LANGUAGE: eng

NlmUniqueID: 7605801

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Grant and Affiliation Information for Sexual Reproduction as the Cause of Heat Resistance in the Food Spoilage Fungus Byssochlamys spectabilis (Anamorph Paecilomyces variotii).

AFFILIATION: CBS Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT, Utrecht, The Netherlands. r.samson@cbs.knaw.nl.

Country: United States

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MEDLINETA: Appl Environ Microbiol

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