Abstract
The rhizosphere microbiome plays a vital role in crop growth and adaptation. However, the effects of rice genotype, nitrogen (N) fertilization, and their interactions on the rhizosphere bacterial communities in low fertility soil remain poorly understood. In this study, a two-factor field experiment was performed in newly reclaimed mudflat paddies characterized by poor fertility to analyze bacterial communities in the rhizosphere of Yongyou 2640 (japonica/indica hybrid rice, JIH) and Huaidao No.5 (japonica conventional rice, JC) under different N fertilizer rates. Results showed that genotype, followed by N fertilizer rate, was the primary factor affecting rhizobacteria diversity. Rhizobacteria diversity was higher in JIH than in JC and that of JIH and JC did not significantly change overall as N fertilizer rates but increased and decreased at N fertilizer rates of over 300 kg N ha−1, respectively. The inconsistent response was probably attributed to the difference in the increase of ammonium and/or nitrate in the rhizosphere of JIH and JC. Genotype explained approximately 26% of the variation in rhizosphere bacterial communities. Rhizosphere bacterial communities with N fertilizer rates of over 300 kg N ha−1 were more dissimilar to those without N fertilization relative to those with N fertilizer rates of below 300 kg N ha−1, which was mainly attributed to changes in the concentration of ammonium and/or nitrate. The relative abundances of some potential beneficial genera such as Salinimicrobium, Salegentibacter, Gillisia, and Anaerolinea in the rhizosphere of JC and Salegentibacter, Lysobacter, Nocardioides, and Pontibacter in the rhizosphere of JIH were increased under N fertilizer rates of less than 300 kg N ha−1 and positively correlated with rice yields, which indicate that changes in bacterial communities caused by N fertilization might be strongly associated with the improvement of rice yield. Overall, rhizosphere bacterial communities were more sensitive to genotype in newly reclaimed mudflat paddies and showed a consistent response to N fertilizer rates.
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Data availability
Sequences have been deposited in the NCBI under accession number PRJNA729885.
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This work was supported by the Key Research and Development Plan of Jiangsu Province (BE2019343, BE2015337), the National Science and Technology Support Project of China (2015BAD01B03), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Conceptualization, Q.D. and J.H.; methodology, Y.Z.; investigation, Y.Z.; data curation, Y.Z. and Z.C.; writing—original draft preparation, Y.Z.; visualization, Y.Z. and Q.L.; project administration, Y.Z.; funding acquisition, Q.D. All authors have read and agreed to the published version of the manuscript.
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Zhang, Y., Cheng, Z., Li, Q. et al. Responses of rhizosphere bacterial communities in newly reclaimed mudflat paddies to rice genotype and nitrogen fertilizer rate. Environ Sci Pollut Res 30, 38761–38774 (2023). https://doi.org/10.1007/s11356-022-25020-2
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DOI: https://doi.org/10.1007/s11356-022-25020-2