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Int J Syst Evol Microbiol 58 (2008), 1040-1046; DOI  10.1099/ijs.0.65471-0
© 2008 International Union of Microbiological Societies

Dipodascus tetrasporeus sp. nov., an ascosporogenous yeast isolated from deep-sea sediments in the Japan Trench

Takahiko Nagahama1, Mohamed Ahmed Abdel-Wahab1, Yuichi Nogi1, Masayuki Miyazaki1, Katsuyuki Uematsu2, Makiko Hamamoto3 and Koki Horikoshi1

1 Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
2 Marine Technology Center, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
3 Department of Life Sciences, School of Agriculture, Meiji University, 1-1 Higashi Mita, Tama-ku, Kawasaki 214-8571, Japan

Correspondence
Takahiko Nagahama
nagahama{at}jamstec.go.jp

Dipodascus tetrasporeus sp. nov. is described as a novel yeast species in the family Dipodascaceae to accommodate an isolate recovered from sediments collected on the deep-sea floor in the north-western Pacific Ocean. In the clade comprising the genera Dipodascus, Galactomyces and Geotrichum, this is the only species that forms asci that bear four ascospores. The ascospore is surrounded by an irregular exosporium wall, similar to what is observed in the genus Galactomyces, but they are released by rupture, which is characteristic of Dipodascus and not Galactomyces. D. tetrasporeus is remarkably divergent (>10 % difference) in its D1/D2 26S rDNA sequence from any other known species. Although maximum-likelihood analysis of combined 18S rDNA and D1/D2 26S rDNA sequences cannot elucidate a reliable position for this species, it was placed among Geotrichum carabidarum, Geotrichum cucujoidarum, Geotrichum fermentans and Geotrichum histeridarum, which also have morphological and physiological affinity with the species. The species is homothallic. The type strain of Dipodascus tetrasporeus sp. nov. is strain SY-277T (=NBRC 103136T =CBS 10071T).

Abbreviations: ITS, internal transcribed spacer; ML, maximum likelihood

The GenBank/EMBL/DDBJ accession number for the region covering the 18S rDNA and the 26S rDNA D1/D2 domain of D. tetrasporeus SY-277T is AB300502.






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