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首页> 外文期刊>Mycologia >Trichoderma matsushimae and T. aeroaquaticum: two aero-aquatic species with Pseudaegerita-like propagules
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Trichoderma matsushimae and T. aeroaquaticum: two aero-aquatic species with Pseudaegerita-like propagules

机译：松毛木霉和水生T. aeroaquaticum：两种具有假单胞菌繁殖体的水生水生物种

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摘要

Four isolates tentatively identified as Pseudaegerita matsushimae on the basis of the morphology of bulbil-like propagules were collected from substrates submerged in water in Thailand and Japan. In culture studies the two Thai isolates were found to produce phialoconidia on conidiogenous cells and phialoconidiophores whose morphology was similar to that of Trichoderma. Phylogenetic analysis based on D1/D2 regions of LSU rDNA sequences showed that the four isolates were nested in Hypocrea/Trichoderma (Hypocreales) while P. corticalis, the type species of Pseudaegerita, belongs to Hyaloscypha (Helotiales). Preliminary analysis by ISTH Web tools based on 5.8S-ITS rDNA and phylogenetic analysis based on rpb2 and tef1-int4 genes showed that the isolates have specific sequences of Trichoderma (anchors 1–5) and belong to the Hamatum clade but they grouped apart from any known species of Trichoderma. The sequences of the tef1-int4 gene, which were amplified from the authentic specimen of P. matsushimae (IMI 266915), also showed that it belongs to the Hamatum clade closely clustering with T. yunnanense but separate from our four isolates. The morphology of P. matsushimae (IMI 266915), especially the sizes of phialides and phialoconidia, were different from T. yunnanense. Thus, we conclude that IMI 266915 and our isolates are to be assigned to two different species in the Hamatum clade of Trichoderma, although both species have similar morphology of bulbils and phialoconidia. Morphology and molecular data revealed that P. matsushimae should be assigned to the genus Trichoderma as T. matsushimae and the Thai and Japanese isolates are placed in T. aeroaquaticum sp. nov. This finding supports the interpretation that aero-aquatic fungi have evolved from terrestrial fungi. We assume that these fungi probably were derived from typically soil-inhabiting species of Trichoderma; an adaptation to aquatic environments is shown by formation of bulbil-like propagules floating on water.
机译：在泰国和日本，从淹没在水中的基质中收集了根据球茎状繁殖体的形态初步鉴定为松毛假单胞菌的四个分离株。在文化研究中，发现这两种泰国分离株在形态相似于木霉属的分生孢子细胞和phiphooconidiophores上产生phialoconidia。基于LSU rDNA序列D1 / D2区域的系统进化分析表明，这四个分离株嵌套在Hypocrea /木霉属（Hypocreales）中，而Pseudaegerita的典型种类皮质疟原虫属于Hyaloscypha（Helotiales）。使用基于5.8S-ITS rDNA的ISTH Web工具进行的初步分析以及基于rpb2和tef1-int4基因的系统发育分析表明，这些分离株具有木霉的特定序列（锚定1-5），属于哈马木进化枝，但它们与木霉的任何已知种类。从松果假单胞菌的真实标本（IMI 266915）扩增的tef1-int4基因的序列也表明，它属于与云南山毛榉紧密聚集的哈姆塔姆进化枝，但与我们的四个分离株分开。松散假单胞菌（IMI 266915）的形态，尤其是phialides和phialoconidia的大小，与云南丁香不同。因此，我们得出的结论是，尽管IMI 266915和我们的分离物将被分配到木霉属哈马塔姆进化枝中的两个不同物种，尽管这两个物种的球茎和毛盘菌的形态相似。形态学和分子数据表明，应将松木假单胞菌归为木霉属，如松木假单胞菌，并将泰国和日本的分离株放置在A. aeroaquaticum sp。中。十一月这一发现支持了航空水生真菌已从陆生真菌进化而来的解释。我们认为这些真菌可能源自典型的土壤生木霉菌。通过在水上漂浮的鳞茎状繁殖体显示出对水生环境的适应性。

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