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Alternate states dominate the bacterial endophyte community of a tropical tree

机译：备用状态在细菌体内寄生菌社区的热带树

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Abstract Little is known about how bacterial endophyte communities may vary from one tree to another of the same species. We sampled nine standardized replicates from the green stems of an ethnomedicinal tropical tree, Santiria apiculata, in a Malaysian rainforest, to investigate endophyte variation from one plant to another. DNA was extracted axenically from the inner stem, and PCR-amplified for the 16s rRNA gene, followed by Illumina HiSeq sequencing. For comparison, the rhizosphere soil of the same trees was also sampled, and the 16s rRNA genes sequenced. Santiria stems contained a diverse community of more than 1100 Operational Taxonomic Units (OTUs), which partitioned clearly into two community types. One community (here dubbed ‘rhizosphere-like’) resembled the rhizosphere soil in its major OTUs, while the other (‘rhizosphere-unlike’) was more distinct and dominated by the genus Bacillus. Nestedness analysis confirmed that both the rhizosphere-like and the rhizosphere-unlike stem communities tended to be a subset of the rhizosphere community. The β-nearest taxon index (βNTI) analysis revealed that the stem communities were dominated by stochastic processes, whereas deterministic processes with homogenizing selection dominated the rhizosphere soil. It appears that the endophyte community in Santiria may be dominated by colonization and priority effects, and it may derive from the rhizosphere community. The potential for alternate steady states within the endophyte community should be considered as a possible influence on plant growth and ecology.
机译：文摘是鲜为人知的细菌内生植物社区可能会有所不同从一个树另一个相同的物种。标准化复制的绿色茎一个ethnomedicinal热带树,Santiriaapiculata,马来西亚雨林内生植物变化从一个工厂进行调查另一个地方。内在的茎,扩增的菌进行16 s rRNA基因,其次是Illumina公司HiSeq测序。的根际土壤比较,是一样的树也被取样,16 s rRNA基因测序。社区1100多操作分类单位(辣子鸡)分区明显分成两个社区类型。“rhizosphere-like”)就像根际土壤主要辣子鸡,而另一个(“rhizosphere-unlike”)是不同的以属杆菌为主。分析证实,rhizosphere-like和rhizosphere-unlike干社区往往是根际的一个子集社区。分析显示,茎社区由随机过程,而确定的流程与均质化选择根际土壤主导。看来,Santiria内生植物群落可能是由殖民和优先级影响,它可能来自根际社区。州内的内生植物群落认为是一个可能的对植物的影响增长与生态。

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