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Effect of Enterobacter bugandensis R-18 on Maize Growth Promotion Under Salt Stress
Xingguo Tian1, Qianru Liu1, Jingjing Song1
1Ningxia Key Laboratory for the Development and Application of Microbial Resources in Extreme Environments, College of Biological Science and Engineering, North Minzu University, Yinchuan 750021, China.
Microorganisms
|August 28, 2025
Summary
Plant growth-promoting bacteria (PGPB) like Enterobacter bugandensis R-18 can help crops overcome salt stress. This study shows R-18 enhances maize growth and resilience in saline conditions.
Area of Science:
- Microbiology
- Plant Science
- Agronomy
Background:
- Soil salinization is a major agricultural challenge.
- Plant growth-promoting bacteria (PGPB) offer a sustainable solution to mitigate salinity stress.
- Understanding PGPB mechanisms is crucial for improving crop resilience.
Purpose of the Study:
- To isolate and identify a PGPB from saline-alkali soil.
- To evaluate the potential of the isolate, Enterobacter bugandensis R-18, in alleviating NaCl-induced stress in maize (Zea mays L.).
- To elucidate the mechanisms by which R-18 promotes plant growth under salinity.
Main Methods:
- Isolation and identification of bacterial strain R-18 using 16S rRNA gene sequencing.
- Characterization of R-18 for halotolerance, alkaliphilic adaptation, and plant growth-promoting traits (nitrogen fixation, P/K solubilization, ACC deaminase activity, IAA production).
- Evaluation of R-18's effect on maize growth, ion homeostasis, physiological parameters (chlorophyll, proline, MDA), and antioxidant enzyme activities under hydroponic NaCl stress.
Main Results:
- Enterobacter bugandensis R-18 was identified and showed tolerance to 2.0-10.0% NaCl and pH 8.0-11.0.
- R-18 exhibited significant plant growth-promoting activities, including IAA biosynthesis and ACC deaminase activity.
- Inoculation with R-18 significantly improved maize growth parameters, K+/Na+ ratio, chlorophyll and proline content, and modulated antioxidant enzyme activities under 100 mM NaCl stress.
Conclusions:
- Enterobacter bugandensis R-18 is an effective PGPB for alleviating NaCl-induced stress in maize.
- R-18 enhances maize resilience through improved ion homeostasis, osmotic adjustment, and reduced oxidative damage.
- This study highlights the potential of R-18 as a bio-fertilizer for sustainable agriculture in saline environments.
