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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (6): 985-.doi: 10.19802/j.issn.1007-9084.2019312

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Response of rhizosphere bacterial community structure associated with peanut (Arachis hypogaea L.) to high salinity and drought stress

  

  1. 1. Shandong Peanut Research Institute, Qingdao 266100, China; 2. Bio-Tech Research Center, Shandong Academy of Agricultural Sciences, Shandong Key Lab. of Genetic Improvement, Ecology and Physiology of Crops, Jinan 250100, China
  • Online:2020-12-28 Published:2020-11-18

Abstract: To study the effect of high salinity and drought stress on bacterial community structure and diversity
in peanut rhizosphere soil, pot experiment was conducted to set up the salt and drought treatment experiments in
this study. The total DNA of the mature flowering rhizosphere soil was extracted and deep sequencing of V3-V4 re⁃
gion of 16S rRNA gene was performed to characterize the bacterial community structure of drought-treated and salttreated
peanuts. Taxonomic analysis showed that Actinobacteria, Alphaproteobacteria, norank_p__ Saccharibacte⁃
ria, Cyanobacteria, Acidobacteria, Gemmatimonadetes and Betaproteobacteria were the dominant class in the pea⁃
nut rhizosphere. Comparisons of bacterial community structure of normally-grown peanuts revealed that the relative
abundance of Alphaproteobacteria and Cyanobacteria increased after stress treatments, among them Cyanobacteria
was significant induced, suggesting that Cyanobacteria might have crucial implications for plant survival and stress
tolerance. Many biotic and abiotic stresses altered rhizosphere soil microdomain structure and had an evident effect
on the bacterial community diversity in peanut rhizosphere. Modifying microbial structure and soil microdomain en⁃
vironment were effective ways to improve plant stress tolerance.

Key words:  , peanut (Arachis hypogaea L.) rhizosphere;drought and salt stress;bacterial community structure diversity;16S rRNA

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