Sexual reproduction in Aspergillus tubingensis from section Nigri

被引：29

作者：

Horn, Bruce W. ^{[1
]}

Olarte, Rodrigo A. ^{[2
]}

Peterson, Stephen W. ^{[3
]}

Carbone, Ignazio ^{[2
]}

机构：

[1] Agr Res Serv, Natl Peanut Res Lab, USDA, Dawson, GA 39842 USA

[2] N Carolina State Univ, Ctr Integrated Fungal Res, Dept Plant Pathol, Raleigh, NC 27695 USA

[3] Agr Res Serv, Natl Ctr Agr Utilizat Res, USDA, Peoria, IL 61604 USA

来源：

MYCOLOGIA | 2013年 / 105卷 / 05期

关键词：

ascospores; Aspergillus flavus; A; niger; heterothallism; mating type; sclerotium; stroma; PHYLOGENETIC SPECIES RECOGNITION; AFLATOXIN GENE-CLUSTER; OCHRATOXIN-A; RECOMBINATION; NIGER; ASCOCARPS; IDENTIFICATION; POPULATIONS; DIVERSITY; EVOLUTION;

D O I：

10.3852/13-101

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

A sclerotium-forming member of Aspergillus section Nigri was sampled from a population in a single field in North Carolina, USA, and identified as A. tubingensis based on genealogical concordance analysis. Aspergillus tubingensis was shown to be heterothallic, with individual strains containing either a MAT1-1 or MAT1-2 mating-type gene. Strains of opposite mating type were crossed on mixed cereal agar and incubated for 5-6 months. Stromata typically formed 1-2 indehiscent ascocarps containing asci and ascospores within the pseudo-parenchymatous matrix in a manner similar to the Petromyces sexual stage from section Flavi, which is closely related to section Nigri. Ascospores of A. tubingensis differed from those of section Flavi species in the reticulate ornamentation of ascospores and the presence of two crests that form an equatorial furrow. Sexual reproduction in A. tubingensis may be useful for enhancing enzyme and organic acid production through recombination-mediated genetic engineering of industrial strains.

引用

页码：1153 / 1163

页数：11

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