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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Microbiol. | doi: 10.3389/fmicb.2019.02209

Variation in Actinobacterial Community Composition and Potential Function in Different Soil Ecosystems Belonging to the Arid Heihe River Basin of Northwest China

 Binglin Zhang1*,  Xiukun Wu1, Xisheng Tai2,  Likun Sun3, Minghui Wu4, Wei Zhang1, Ximing Chen1,  Gaosen Zhang1,  Tuo Chen5*,  Guangxiu Liu1 and  Paul Dyson6
  • 1Northwest Institute of Eco-Environment and Resources (CAS), China
  • 2College of Geography and Environmental Engineering, Lanzhou City University, China
  • 3College of Animal Science and Technology, Gansu Agricultural University, China
  • 4State Key Laboratory of Cryospheric Science, Chinese Academy of Sciences, China
  • 5State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, China
  • 6Institute of Life Science, Swansea University, United Kingdom

Actinobacteria are known for their metabolic potential to produce diverse secondary metabolites such as antibiotics. Actinobacteria also play important roles in biogeochemical cycling and how soils develop. However, little is known about the effect of vegetation type on Actinobacterial community structures in soils from arid regions. For these reasons, we have analysed the Actinobacterial communities of five types of ecosystem (tree grove, shrub, meadow, desert and farm) in the Heihe river basin. Using 16S rRNA high-throughput sequencing, we found 11 classes of Actinobacteria and the dominant classes were the Actinobacteria (36.2%), Thermoleophilia (28.3%), Acidimicrobiia (19.4%). 5 classes, 15 orders, 20 families and 36 genera were present in all samples. The dominant generalist genera were Gaiella, Solirubrobacter, Nocardioides, Mycobacterium and Pseudonocardia. The Actinobacterial community structures were significantly affected by the environment and vegetation type. The diversity of the Actinobacterial community in the desert ecosystem was high, and this ecosystem harboured the highest proportion of unclassified sequences, representing rare actinobacteria. Functional metagenomic prediction, using PICRUSt, indicated that Actinobacteria play an important role in nitrogen cycling in both desert and cultivated farm ecosystems.

Keywords: Actinobacterial community, diversity, Vegetation gradient, Arid region, Heihe River

Received: 12 Apr 2019; Accepted: 09 Sep 2019.

Copyright: © 2019 Zhang, Wu, Tai, Sun, Wu, Zhang, Chen, Zhang, Chen, Liu and Dyson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Mx. Binglin Zhang, Northwest Institute of Eco-Environment and Resources (CAS), Lanzhou, China, brightzbl@126.com
Prof. Tuo Chen, State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Lanzhou, China, chentuo@lzb.ac.cn