Molecular Soil Biology 2025, Vol.16, No.1, 16-26 http://bioscipublisher.com/index.php/msb 19 Table 1 Halophilic bacteria species with the salt-tolerant range (Adapted from Kumawat et al., 2022) Halophilic Bacterial Species Salinity Range for the Growth and Development (%) Kangiella spongicola 2-15 Halanaerocella petrolearia 6-26 Salisediminibacterium cookie 3-30 Amphibacillus cookie 6-26 Desulfohalophilus alkaliarsenatis 12.5-33 Halanaerobacter jeridensis 6-30 Natribacillus halophilus 7-23 Fodinibius salinus 10-15 Alkalibacterium gilvum 0-17.5 Halomicroarcula pellucida 20-30 Salinibacter iranicus 12-30 Halanaerobium sehlinen 5-30 Saliterribacillus perciscus 0.5-22.5 Limimonas halopajila 15-30 Aquibacillus halophilus 0.5-20 Halobellus salinus 15-30 Bacillus daqingensis 0-16 Oceanicola flagellatus 0-21 Spiribacter salinus 10-25 Halomonas huangheensis 1-20 Salifodinibacter halophilus 25 Halomonas sambharensis 5-8 Lentibacillus saliphilus sp. nov. (type strain YIM 93176T) 0-22 Halomonas urmianasp. 0.5-20 Marinobacter halodurans sp. nov. 1-18 Aliifodinibius saliphilus sp. nov. 3-25 Arhodomonas recens 2-25 3.3 Interaction between SynComs and soil properties The interaction between SynComs and soil properties is a critical factor in the success of bioremediation efforts. Soil salinity and alkalinity significantly influence the structure and function of microbial communities. For example, increased soil salinity and alkalinity enhance the availability of heavy metals like cadmium, which in turn affects microbial community structures and interactions (Wang et al., 2019). The presence of specific microbial taxa, such as oligotrophic and haloalkaliphilic bacteria, is enriched under saline-alkaline conditions, indicating their role in adapting to and mitigating soil stress (Wang et al., 2019). Furthermore, the initial pH and organic carbon dose rates in soil are key factors controlling the rates and extent of microbially driven pH neutralization, with lower initial pH and higher organic carbon conditions leading to more effective bioremediation (Santini et al., 2016). 4 Optimization of SynComs for Saline-Alkali Soil Bioremediation 4.1 Selection and engineering of microbial strains suitable for saline-alkali environments The selection and engineering of microbial strains for saline-alkali soil bioremediation require a deep understanding of the native microbial communities and their adaptability to extreme conditions. Studies have shown that microbial assemblages in saline-alkali soils are primarily driven by soluble salt ion components rather than salinity alone, with fungal communities demonstrating higher tolerance and stability compared to bacterial communities (Zhang et al., 2021). Keystone microbial taxa, such as certain bacteria and fungi, have been identified for their potential adaptability and beneficial roles in restoring saline-alkali soils (Zhang et al., 2021). Additionally, the diversity of prokaryotic microorganisms in extreme environments, such as the Qarhan Salt Lake area, highlights the importance of selecting strains with specific metabolic pathways like nitrogen fixation and methanogenesis, which are crucial for biogeochemical cycles (Wang and Bao, 2021).
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