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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (7): 38-49.DOI: 10.11686/cyxb2021202

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Relationship between plant functional traits and rhizosphere bacterial community structure of two Caragana species

Yuan-yuan LI1,2,3(), Ting-ting XU4, Zhe AI3, Zhao-na ZHOU3, Fei MA1,2()   

  1. 1.Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China,Ningxia University,Yinchuan 750021,China
    2.School of Ecology and Environment,Ningxia University,Yinchuan 750021,China
    3.School of Geography and Planning,Ningxia University,Yinchuan 750021,China
    4.School of Life Science,Ningxia University,Yinchuan 750021,China
  • Received:2021-05-12 Revised:2021-08-05 Online:2022-07-20 Published:2022-06-01
  • Contact: Fei MA

Abstract:

In this study, we collected soil samples from Caragana liouana and Caragana microphylla across different geographical populations and the diversity and composition of soil bacterial community were compared and analyzed using Illumina MiSeq high-throughput sequencing technology. Our objective was to test the relationships between plant functional traits and the rhizosphere soil bacterial community, in anticipation this information might provide insight into microbiological mechanisms of Caragana adaptation to drought environments. Results showed that 22 phyla, 62 classes, 131 orders, 185 families and 304 genera were identified from all rhizosphere soils. At the phylum level, the dominant taxa were Proteobacteria, Acidobacteria, Bacteroidetes and Actinobacteria. RhizobiumSphingomonas, RB41 and Bacillus were predominant genera. Although the soil bacterial community diversity (Chao1 index, ACE index, Shannon index and Simpson index) showed no significant difference between C. liouana and C. microphylla, a principal coordinate analysis demonstrated that there were significant differences between them in the bacterial community structure. A Mantel test indicated a significant positive relationship between plant functional traits and bacterial community composition of the rhizosphere soil, and furthermore, based on the redundancy analysis, plant height, leaf dry matter content, specific leaf area, leaf thickness and leaf length were the dominant factors associated with changes in the rhizosphere bacterial community structure. Overall, the present results indicate that there are significant differences between C. liouana and C. microphylla in the structure of their soil bacterial communities, and the bacterial community structure of the rhizosphere soil is strongly linked to plant functional traits across the geographical populations.

Key words: Caragana liouana, Caragana microphylla, rhizosphere, bacterial community, plant functional traits