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Pettersson, O. V., Leong, S.-l. L., Lantz, H., Rice, T., Dijksterhuis, J., Houbraken, J., . . . Schnürer, J. (2011). Phylogeny and intraspecific variation of the extreme xerophile, Xeromyces bisporus. Fungal Biology, 115(11), 1100-1111
Open this publication in new window or tab >>Phylogeny and intraspecific variation of the extreme xerophile, Xeromyces bisporus
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2011 (English)In: Fungal Biology, ISSN 1878-6146, E-ISSN 1878-6162, Vol. 115, no 11, p. 1100-1111Article in journal (Refereed) Published
Abstract [en]

The filamentous ascomycete Xeromyces bisporus is an extreme xerophile able to grow down to a water activity of 0.62. We have inferred the phylogenetic position of Xeromyces in relation to other xerophilic and xerotolerant fungi in the order Eurotiales. Using nrDNA and betatubulin sequences, we show that it is more closely related to the xerophilic food-borne species of the genus Chrysosporium, than to the genus Monascus. The taxonomy of X. bisporus and Monascus is discussed. Based on physiological, morphological, and phylogenetic distinctiveness, we suggest that Xeromyces should be retained as a separate genus.

Place, publisher, year, edition, pages
Oxon, United Kingdom: Elsevier, 2011
Keywords
Chrysosporium, Eurotiales, Fungi, Monascus, Phylogeny, Xeromyces bisporus, Xerophile
National Category
Botany
Identifiers
urn:nbn:se:oru:diva-52201 (URN)10.1016/j.funbio.2011.06.012 (DOI)000297873100002 ()22036289 (PubMedID)2-s2.0-80955158588 (Scopus ID)
Note

Funding Agencies:

Faculty of Science and Agriculture 

Swedish University of Agricultural Sciences

Carl-Tryggers Foundation

Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2017-11-21Bibliographically approved
Jennessen, J., Schnürer, J., Olsson, J., Samson, R. A. & Dijksterhuis, J. (2008). Morphological characteristics of sporangiospores of the tempe fungus Rhizopus oligosporus differentiate it from other taxa of the R-microsporus group. Mycological Research, 112, 547-563
Open this publication in new window or tab >>Morphological characteristics of sporangiospores of the tempe fungus Rhizopus oligosporus differentiate it from other taxa of the R-microsporus group
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2008 (English)In: Mycological Research, ISSN 0953-7562, E-ISSN 1469-8102, Vol. 112, p. 547-563Article in journal (Refereed) Published
Abstract [en]

The fungus Rhizopus oligosporus (R. microsporus var. oligosporus) is traditionally used to make tempe, a fermented food based on soybeans. Interest in the fungus has steadily increased, as it can also ferment other substrates, produce enzymes, and treat waste material. R. oligosporus belongs to the R. microsporus group consisting of morphologically similar taxa, which are associated with food fermentation, pathogenesis, or unwanted metabolite production (rhizonins and rhizoxins). The ornamentation pattern, shape, and size of sporangiospores of 26 R. microsporus group strains and two R. oryzae strains were studied using low-temperature SEM (LT-SEM) and LM. This study has shown that: (1) LT-SEM generates images from well-conserved sporangiophores, sporangia, and spores. (2) Robust spore ornamentation patterns can be linked to all different taxa of the R. microsporus group, some previously incorrectly characterized as smooth. Ornamentation included valleys and ridges running in parallel, granular plateaus, or smooth polar areas. Distribution of ornamentation patterns was related to spore shape, which either was regular, ranging from globose to ellipsoidal, or irregular. Specific differences in spore shape, size, and ornamentation were observed between Rhizopus taxa, and sometimes between strains. (3) R. oligosporus has a defect in the spore formation process, which may be related to the domesticated nature of this taxon. It had a high proportion, 10-31 %, of large and irregular spores, and was significantly differentiated from other, natural Rhizopus taxa as evaluated with partial least squares discriminant analysis. it is remarkable that the vehicle of distribution, the sporangiospore, is affected in the strains that are distributed by human activity. This provides information about the specificity and speed of changes that occur in fungal strains because of their use in (food) industry.

Place, publisher, year, edition, pages
Oxon, United Kingdom: Elsevier, 2008
Keywords
Domestication, Mucoraceae, sporangium, taxonomy, tempeh
National Category
Environmental Sciences
Identifiers
urn:nbn:se:oru:diva-52295 (URN)10.1016/j.mycres.2007.11.006 (DOI)000256271000005 ()18400482 (PubMedID)2-s2.0-42649119811 (Scopus ID)
Available from: 2016-09-19 Created: 2016-09-16 Last updated: 2017-11-21Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2649-1704

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