The Island of Borneo is a major biodiversity hotspot, and in the Malaysian state of Sabah, ultramafic soils are extensive and home to more than 31 endemic nickel hyperaccumulator plants. The aim of this study was to characterize the structure and the diversity of the rhizosphere bacterial communities of several of these nickel hyperaccumulator plants and factors that affect these bacterial communities in Sabah. The most abundant phyla were Proteobacteria, Acidobacteria and Actinobacteria. At family level, Burkholderiaceae and Xanthobacteraceae (Proteobacteria phylum) were the most abundant families in the hyperaccumulator rhizospheres. Redundancy analysis based on soil chemical analyses and relative abundances of the major bacterial phyla showed that abiotic factors of the studied sites drove the bacterial diversity. For all R. aff. Bengalensis rhizosphere soil samples, irrespective of studied site, the bacterial diversity was similar. Moreover, the Saprospiraceae family showed a high representativeness in the R. aff. Bengalensis rhizosphere soils and was linked with the nickel availability in soils. The ability of R. aff. Bengalensis to concentrate nickel in its rhizosphere appears to be the major factor driving the rhizobacterial community diversity unlike for other hyperaccumulator species. This article is protected by copyright. All rights reserved.

中文翻译：

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来自婆罗洲岛（马来西亚）的镍超蓄积植物物种根际的细菌群落多样性。

婆罗洲岛是主要的生物多样性热点，在马来西亚的沙巴州，超镁铁质土壤广泛，拥有31多种地方性镍超富集植物。这项研究的目的是表征其中一些镍超富集植物的根际细菌群落的结构和多样性，以及影响沙巴州这些细菌群落的因素。最丰富的门是Proteobacteria，Acidobacteria和Actinobacteria。在家庭层面上，伯克霍尔德杆菌科和黄杆菌科（Proteobacteria phylum）是高蓄积根际中最丰富的科。根据土壤化学分析和主要细菌门的相对丰度进行的冗余分析表明，研究部位的非生物因素驱动了细菌的多样性。对于所有R. aff。孟加拉根际土壤样品，无论研究地点如何，细菌多样性都是相似的。此外，腐螺科在R. aff中显示出很高的代表性。孟加拉的根际土壤和土壤中镍的有效性有关。R. aff。的能力。与其他高蓄积物种不同，孟加拉将镍在其根际中富集似乎是驱动根际细菌多样性的主要因素。本文受版权保护。版权所有。与其他高蓄积物种不同，孟加拉将镍在其根际中富集似乎是驱动根际细菌多样性的主要因素。本文受版权保护。版权所有。与其他高蓄积物种不同，孟加拉将镍在其根际中富集似乎是驱动根际细菌多样性的主要因素。本文受版权保护。版权所有。