Abstract
Plants release various metabolites from roots and root exudates contribute to differences in stress tolerance among plant species. Plant and soil microbes have complex interactions that are affected by biotic and abiotic factors. The purpose of this study was to examine the differences in metabolites in root exudates of rice (Oryza sativa) cultivars and their correlation with bacterial populations in the rhizosphere. Two rice cultivars (O. sativa cv. Akamai and O. sativa cv. Koshihikari) were grown in soils fertilized with 0 g P kg−1 (− P) or 4.8 g P kg−1 (+ P). Root exudates and root-attached soil were collected at 13 and 20 days after transplanting (DAT) and their metabolites and bacterial community structure were determined. The exudation of proline, serine, threonine, valine and 4-coumarate were increased under low P conditions in both cultivars. There was a positive correlation between the concentration of pantothenate in root exudates and the representation of members of the genera Clostridium and Sporosarcina, which were negatively correlated with root dry weight. Gracilibacter, Opitutus, Pelotomaculum, Phenylobacterium and Oxobacter were positively correlated with root dry weight and presence of allantoin, 2-aminobtyrate and GlcNac. This study provides new information about the response of plants and rhizosphere soil bacteria to low P conditions.
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Acknowledgements
This study was partly supported by a Grant-in-Aid for Scientific Research (No. 15H04466) from the Japan Society for the Promotion of Science (JSPS), the research project “Development of mitigation and adaptation techniques to global warming in the sectors of agriculture, forestry, and fisheries” funded by the Ministry of Agriculture, Forestry and Fisheries (MAFF), and Japan Advanced Plant Science Network, Japan.
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All authors contributed to the study conception and design. CM and MS contributed equally to this research. Material preparation, data collection, and analysis were performed by CM, MS, and AK. The first draft of the manuscript was written by CM, MS, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Matsushima, C., Shenton, M., Kitahara, A. et al. Multiple analysis of root exudates and microbiome in rice (Oryza sativa) under low P conditions. Arch Microbiol 203, 5599–5611 (2021). https://doi.org/10.1007/s00203-021-02539-5
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DOI: https://doi.org/10.1007/s00203-021-02539-5