Abstract
Background and aims
Soil microbiome is the key driver mediating soil P transformation in agroecosystems. However, the underlying genomic information related to soil P cycling in response to organic C inputs is largely unknown.
Methods
By using metagenomic sequencing, we investigated the effect of P fertilization and C input (i.e., glucose and lignin) on functional profiles of microbial genes related to P cycling in bulk and rhizosphere soils. Maize plants were grown for 47 days in Ultisols with or without P-fertilizer history.
Results
Glucose decreased rhizosphere H2O-Pi concentrations in soil with P history, increased that in soil without P history; while lignin increased that in both soils. Ogranic C inputs increased the relative abundances of phnGHIJLMNP and pit genes by 17–138% and 2.3–31%, decreased those of phoB, phoR and pstABCS genes by 3.6–18%, 12–31% and 11–26%, respectively, in rhizosphere soils irrespective of P history. In the rhizosphere rather than bulk soil, the proportion of P starvation regulation-related genes was higher in lignin treated-soils without than with P history. Proteobacteria (10–89%) and Acidobacteria (0.41–57%) were the dominant phyla and main contributors to soil P transformation-related genes (e.g., appA, phoAD, gcd). Elevated soil pH induced by organic C inputs also diversified the composition of genes involved in P transformation.
Conclusions
Organic C altered P cycling-related gene composition irrespective of soil P status, which facilitated P transformation. Proteobacteria and Acidobacteria were vital in mediating C and P metabolisms.
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Funding
This study was supported by the Science and Technology Program of Zhejiang Province (2022C02046), the National Natural Science Foundation of China (41991334), Agriculture Research System of China (CARS-01), Department of Education Project of Jiangxi Province (GJJ2200417) and Natural Science Foundation of Jiangxi Province (20232BAB213092).
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Jianming Xu designed the experiment, provided the fundings, and contributed to the revisions. Yanlan Huang performed the experiment, wrote the first draft of the manuscript. Jiahui Lin carried out the statistical analysis. Caixian Tang revised the manuscript critically.
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Huang, Y., Lin, J., Tang, C. et al. Organic carbon inputs shift the profiles of phosphorus cycling-related genes in maize rhizosphere. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06605-x
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DOI: https://doi.org/10.1007/s11104-024-06605-x