Molecular-genetic differentiation of the dairy yeast Kluyveromyces lactis and its closest wild relatives

被引：31

作者：

Naumova, ES ^{[1
]}

Sukhotina, NN ^{[1
]}

Naumov, GI ^{[1
]}

机构：

[1] State Inst Genet & Select Ind Microorganisms, Moscow 117545, Russia

来源：

FEMS YEAST RESEARCH | 2004年 / 5卷 / 03期

关键词：

Kluyveromyces lactis; molecular systematics; phylogenetic analysis; ribosomal DNA;

D O I：

10.1016/j.femsyr.2004.08.006

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The currently accepted formal division of the species Kluyveromyces lactis into two taxonomic varieties, Kl. lactis var. lactis and Kl. lactis var. drosophilarum, is based arbitrarily on phenotypic and ecological characters. On the other hand, the genetic hybridisation analysis and molecular karyotyping of its synonyms allowed us [FEMS Yeast Res. 2 (2002) 39] to reinstate them in the genus Zygofabospora Kudriavzev emend G. Naumov (=Kluyveromyces Kurtzman et al., 2001) as the varieties Zf lactis var. lactis, Zj. lactis var. krassilnikovii, Zf lactis var. drosophilarum, Zf lactis var. phaseolospora and Zf lactis var. vanudenii. In the present work, we studied forty Kl. lactis strains of different geographic and ecological origins by means of restriction analysis of the PCR-amplified non-coding nrDNA regions encompassing the intergenic spacer 2 (IGS2) and the internal transcribed spacers (ITS1 and ITS2). The results confirmed the complex structure of Kl. lactis. Moreover, four additional genetic populations were identified: three in North America ('aquatic', 'pseudovanudenii' and 'new') and one in Far-East Asia ('oriental'). Comparative sequence analysis of the 5.8S-rRNA gene and the two internal transcribed spacers revealed that the populations 'aquatic' and 'oriental' formed distinct taxa which are phylogenetically separate from the five known populations. However, some discrepancies were observed between the restriction and sequencing data. Genetic hybridisation analysis needs to be done to further elucidate the genetic relationships between the populations of Kl. lactis. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.

引用

页码：263 / 269

页数：7

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