Abstract
Background and Aim
Increased soil salinization caused by natural or human activities is the leading cause of soil degradation. Cultivating salt-tolerant crops is an effective way to cope with soil salinity. However, the key salinity-tolerance traits and regulation mechanisms in salt-tolerant crops and the relevant ecological functions of the microbiome in the rhizosphere remain largely unexplored.
Methods
The phenotypic, physiological, morphological, and molecular responses of salt-sensitive (SS 212) and salt-tolerant (ST 47) broomcorn millet (Panicum miliaceum L.) to salinity were dissected, and the composition and variation in the rhizospheric microorganisms under saline and non-saline conditions were established.
Results
Salinity tolerance was achieved in ST 47 by maintaining Na+/K+ balance and intact cell surface and internal structures and regulating the expression of PmCNGC (Na+ uptake), PmNHX (Na+ sequestration), and PmSOS1 (Na+ extrusion). Moreover, the genotype mediated the differences in the rhizospheric microbial community. The ST 47 rhizosphere had a stronger and more stable fungal composition under saline conditions compared to SS 212. In addition, ST 47 reshaped the microorganisms in the rhizosphere by recruiting specific beneficial microbes, namely Haliangium, Marispirillum, RB41, and Saccharospirillum bacteria, which promote soil nutrient cycling, and Acremonium, Blastobotrys, Calostoma, Chaetomium, Chrysosporium, Fusarium, and Scytalidium fungi, which are involved in stress tolerance and resource uptake.
Conclusion
The findings of this study provide an empirical basis for improving crop performance through utilizing a key salt-tolerance mechanism and soil microbial management practices for sustainable agriculture in salinized soil.
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Data availability
The data that supports the findings of this study are available in the supplementary material of this article.
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This work was financially supported by the Minor Grain Crops Research and Development System of Shaanxi Province (NYKJ-2021-YL [XN] 40) and the China Agriculture Research System (CARS-06-A26).
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Yuhao Yuan: Methodology, Formal analysis, Visualization, Writing-original draft. Jiang Li: Investigation, Data curation, Writing-review & editing. Miaomiao Zhang: Conceptualization, Resources. Qinghua Yang: Validation, Writing-review & editing. Baili Feng: Supervision, Funding acquisition.
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Yuan, Y., Li, J., Zhang, M. et al. Broomcorn millet (Panicum miliaceum L.) tolerates soil salinity by regulating salt-tolerance mechanism and reshaping rhizosphere microorganisms. Plant Soil 492, 261–284 (2023). https://doi.org/10.1007/s11104-023-06170-9
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DOI: https://doi.org/10.1007/s11104-023-06170-9