Origine, Structure et Evolution de la Biodiversité, UMR 7205 CNRS/MNHN, Muséum National d'Histoire Naturelle, Paris, France.
Fungal Biol. 2013 Feb;117(2):124-36. doi: 10.1016/j.funbio.2012.12.005. Epub 2013 Jan 8.
Although endophytes of conifers have been extensively studied, few data are available on Cephalotaxaceae. We examined foliar and stem endophytes of Cephalotaxus harringtonia, within its natural range in Japan and outside its natural range in France to study the effect of geography on endophyte community composition. In Japan, rapidly growing endophytes were dominant and may have masked the real diversity, in comparison to France where most endophytes were growing slowly. Analyses of ITS rDNA revealed 104 different Blast Groups among 554 isolates. Almost no overlap between endophyte assemblages of C. harringtonia from the two countries was observed. It seems that Japanese C. harringtonia trees, which should be well adapted to their native site, would host a specific, endemic endophyte community, while trees that have been introduced recently to a foreign site, in France, should have captured existing cosmopolitan and more generalist taxa. In Japan the majority of xylariaceous taxa, which dominated the communities, were unknown and, although closely related to Asian taxa, may be new to science. Dothideomycetes were more prevalent in France. Locally, urban environment, particularly in Japan, may have introduced some perturbations in the native endophyte community of C. harringtonia, with an abundance of generalist fungi such as Nigrospora and Colletotrichum.
尽管对松柏类植物的内生菌进行了广泛的研究，但关于三尖杉科的资料却很少。我们研究了三尖杉属植物在其自然分布范围内的日本和自然分布范围之外的法国的叶片和茎内生菌，以研究地理因素对内生菌群落组成的影响。在日本，快速生长的内生菌占优势，这可能掩盖了真正的多样性，而在法国，大多数内生菌生长缓慢。ITS rDNA 分析显示，在 554 个分离株中存在 104 个不同的 Blast 组。在这两个国家的内生菌组合之间几乎没有重叠。似乎日本的三尖杉树，它们应该很好地适应其本土栖息地，将拥有一个特定的、地方性的内生菌群落，而最近被引入外国栖息地（法国）的树木，应该已经捕获了现有的世界性和更具普遍性的类群。在日本，占主导地位的大多数木霉属内生菌是未知的，尽管它们与亚洲的类群密切相关，但可能对科学界来说是新的。在法国，子囊菌纲更为普遍。在当地，城市环境，特别是在日本，可能会对三尖杉属内生菌的本地群落产生一些干扰，丰富了一些一般性真菌，如黑曲霉和炭疽菌。
