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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A community of unknown, endophytic fungi in western white pine.
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A community of unknown, endophytic fungi in western white pine.

机译：西部白松中未知的内生真菌群落。

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The endophytic fungi of woody plants may be diverse as often claimed, and likewise, they may be functionally novel as demonstrated in a few studies. However, the endophyte taxa that are most frequently reported tend to belong to fungal groups composed of morphologically similar endophytes and parasites. Thus, it is plausible that endophytes are known (i.e., described) parasites in a latent phase within the host. If this null hypothesis were true, endophytes would represent neither additional fungal diversity distinct from parasite diversity nor a symbiont community likely to be novel ecologically. To be synonymous with parasites of the host, endophytes should at least be most closely related to those same parasites. Here we report that seven distinct parasites of Pinus monticola do not occur as endophytes. The majority of endophytes of P. monticola (90% of 2,019 cultures) belonged to one fungal family, the Rhytismataceae. However, not a single rhytismataceous endophyte was found to be most closely related by sequence homology to the three known rhytismataceous parasites of P. monticola. Similarly, neither endophytic Mycosphaerella nor endophytic Rhizosphaera isolates were most closely related to known parasites of P. monticola. Morphologically, the endophytes of P. monticola can be confounded with the parasites of the same host. However, they are actually most closely related to, but distinct from, parasites of other species of Pinus. If endophytes are generally unknown species, then estimates of 1 million endophytes (i.e., approximately 1 in 14 of all species of life) seem reasonable.
机译：如常声称的那样，木本植物的内生真菌可能是多种多样的，同样，如一些研究所示，它们在功能上可能是新颖的。但是，最常报告的内生菌群倾向于属于由形态相似的内生菌和寄生虫组成的真菌类。因此，有可能的是，内生菌是宿主内潜相中已知的（即已描述的）寄生虫。如果这个零假设是正确的，则内生菌既不会代表与寄生虫不同的其他真菌多样性，也不会代表在生态学上很新颖的共生菌群落。要与宿主的寄生虫同义，内生菌至少应与那些相同的寄生虫最密切相关。在这里，我们报告说松果的七个不同的寄生虫不会作为内生菌出现。斑节对虾的大多数内生菌（2,019种培养物中的90％）属于一个真菌科，即Rhytismataceae。但是，没有发现一个单一的类风湿性内生菌通过序列同源性与单株假单胞菌的三个已知的类风湿性寄生虫最密切相关。同样，内生的真菌门孢菌和内生的根瘤菌分离株都与已知的斑节对虾寄生虫没有最密切的关系。从形态上讲，斑节对虾的内生菌可以与同一宿主的寄生虫混杂在一起。但是，它们实际上与其他松属物种的寄生虫关系最密切，但又与之不同。如果内生菌通常是未知物种，那么估计有100万个内生菌（即，大约所有生命物种中的14个）。

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