产黄曲霉毒素真菌黄曲霉中的隐秘物种形成与重组
Cryptic speciation and recombination in the aflatoxin-producing fungus Aspergillus flavus.
作者信息
Geiser D M, Pitt J I, Taylor J W
机构信息
Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.
出版信息
Proc Natl Acad Sci U S A. 1998 Jan 6;95(1):388-93. doi: 10.1073/pnas.95.1.388.
Abstract
Aspergillus flavus, like approximately one-third of ascomycete fungi, is thought to be cosmopolitan and clonal because it has uniform asexual morphology. A. flavus produces aflatoxin on nuts, grains, and cotton, and assumptions about its life history are being used to develop strategies for its biological control. We tested the assumptions of clonality and conspecificity in a sample of 31 Australian isolates by assaying restriction site polymorphisms from 11 protein encoding genes and DNA sequences from five of those genes. A. flavus isolates fell into two reproductively isolated clades (groups I and II). The lack of concordance among gene genealogies among isolates in one of the clades (group I) was consistent with a history of recombination. Our analysis included five strains of the closely related industrial fungus A. oryzae, all of which proved to be clonally related to group I.
摘要
黄曲霉与大约三分之一的子囊菌一样，因其无性形态一致，被认为是世界性的且为克隆性的。黄曲霉在坚果、谷物和棉花上产生黄曲霉毒素，关于其生活史的假设正被用于制定生物防治策略。我们通过检测11个蛋白质编码基因的限制性位点多态性以及其中5个基因的DNA序列，对31株澳大利亚分离株样本中的克隆性和同种特异性假设进行了测试。黄曲霉分离株分为两个生殖隔离的分支（I组和II组）。其中一个分支（I组）的分离株基因谱系之间缺乏一致性，这与重组历史相符。我们的分析包括了5株密切相关的工业真菌米曲霉，所有这些菌株都被证明与I组存在克隆相关性。
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Structural features of a polygalacturonase gene cloned from Aspergillus oryzae KBN616.从米曲霉KBN616克隆的聚半乳糖醛酸酶基因的结构特征
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