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Effects of PGPR and γ-PGA on maize growth and rhizosphere microbial community in saline soil

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  • Zeng, Wenzhi
  • Hou, Yaling
  • Ao, Chang
  • Huang, Jiesheng

Abstract

The application of plant growth-promoting rhizosphere (PGPR) and Gamma-polyglutamic acid (γ-PGA) has a potential role in improving plant tolerance under abiotic stress, while their combined effects remain largely unexplored. This study aimed to evaluate the effects of the joint effects of PGPR and γ-PGA on maize growth and rhizosphere microbial communities under salt stress. A pot experiment consisting of two strain treatments (CK, M10), two γ-PGA treatments (γ0, γ1) and two salt treatments (S1, S2) was performed for this purpose. The results showed that under S1 treatment, the combined application of M10 and γ-PGA could increase plant height, leaf area and dry weight by 11.27%, 36.45% and 8.39% respectively (P<0.05). Under S2 treatment, the combined application of M10 and γ-PGA could increase corn plant height, leaf area and dry weight by 34.46%, 142.80% and 55.81% respectively (P<0.05). In addition, the combined application of M10 and γ-PGA reduced the Na+ content in leaves by 59.43% (P<0.05). The combined application of M10 and γ-PGA significantly increased the proportion of bacterial Firmicutes (mainly including Bacillus_firmus_g_Bacillus and Bacillus_selenatarsenatis) in maize rhizosphere soil. Leaf-Na+ (P<0.001), root-K+ (P<0.01), leaf-total phosphorus (P<0.05), root-total phosphorus (P<0.01) and electron transfer rate (P<0.01) had a significant effect on the changes in the structure of maize rhizosphere bacterial community. The interaction network results showed that the combined application of M10 and γ-PGA could significantly improve the strain numbers that were directly related to plant growth factors. This study not only demonstrated the benefits of the combined application of M10 and γ-PGA in improving plant salt tolerance but also provided insights into the mechanism of plant growth from the perspective of rhizosphere microbial community changes.

Suggested Citation

  • Zeng, Wenzhi & Hou, Yaling & Ao, Chang & Huang, Jiesheng, 2024. "Effects of PGPR and γ-PGA on maize growth and rhizosphere microbial community in saline soil," Agricultural Water Management, Elsevier, vol. 295(C).
    • Handle: RePEc:eee:agiwat:v:295:y:2024:i:c:s0378377424000714
    DOI: 10.1016/j.agwat.2024.108736
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    References listed on IDEAS

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    1. Richard D. Bardgett & Wim H. van der Putten, 2014. "Belowground biodiversity and ecosystem functioning," Nature, Nature, vol. 515(7528), pages 505-511, November.
    2. Qiangqiang Xiong & Jinlong Hu & Haiyan Wei & Hongcheng Zhang & Jinyan Zhu, 2021. "Relationship between Plant Roots, Rhizosphere Microorganisms, and Nitrogen and Its Special Focus on Rice," Agriculture, MDPI, vol. 11(3), pages 1-18, March.
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