The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Effect of Bacillus mesonae H20-5 Treatment on Rhizospheric Bacterial Community of Tomato Plants under Salinity Stress

  • Lee, Shin Ae (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Kim, Hyeon Su (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Sang, Mee Kyung (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Song, Jaekyeong (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Weon, Hang-Yeon (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration)
  • Received : 2021.10.21
  • Accepted : 2021.11.21
  • Published : 2021.12.01
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Abstract

Plant growth-promoting bacteria improve plant growth under abiotic stress conditions. However, their effects on microbial succession in the rhizosphere are poorly understood. In this study, the inoculants of Bacillus mesonae strain H20-5 were administered to tomato plants grown in soils with different salinity levels (EC of 2, 4, and 6 dS/m). The bacterial communities in the bulk and rhizosphere soils were examined 14 days after H20-5 treatment using Illumina MiSeq sequencing of the bacterial 16S rRNA gene. Although the abundance of H20-5 rapidly decreased in the bulk and rhizosphere soils, a shift in the bacterial community was observed following H20-5 treatment. The variation in bacterial communities due to H20-5 treatment was higher in the rhizosphere than in the bulk soils. Additionally, the bacterial species richness and diversity were greater in the H20-5 treated rhizosphere than in the control. The composition and structure of the bacterial communities varied with soil salinity levels, and those in the H20-5 treated rhizosphere soil were clustered. The members of Actinobacteria genera, including Kineosporia, Virgisporangium, Actinoplanes, Gaiella, Blastococcus, and Solirubrobacter, were enriched in the H20-5 treated rhizosphere soils. The microbial co-occurrence network of the bacterial community in the H20-5 treated rhizosphere soils had more modules and keystone taxa compared to the control. These findings revealed that the strain H20-5 induced systemic tolerance in tomato plants and influenced the diversity, composition, structure, and network of bacterial communities. The bacterial community in the H20-5 treated rhizosphere soils also appeared to be relatively stable to soil salinity changes.

Keywords

Acknowledgement

This research was carried out with the support of "Cooperative Research Program for Agricultural Science & Technology Development (Project No. PJ01424401)", Rural Development Administration, South Korea.

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