Abstract
Lettuce plants respond differently to cover crop amendments by altering their biomass and nitrogen uptake (Nup) at different plant growth stages. Nonetheless, plant–microbe interactions involved in the alterations are scarcely studied. This study elucidated how the properties of the soil microbial community inhabiting the rhizosphere associated with lettuce (Lactuca sativa L. var. crispa “Red fire”) change during plant growth stages. Lettuce plants were cultivated in control soil and soil with rye, hairy vetch (HV), and rye plus HV (rye + HV) cover crop amendments. Rhizosphere soil samples were collected at the mid-growth and mature stages of plant development. DNA was extracted from the soil, and the 16S rRNA region was amplified using polymerase chain reaction to analyze bacterial genes and community structures and functions. Cover crop amendments and plant growth stages increased or decreased the relative abundances of bacterial taxa at the genus level. Plant maturity decreased 16S rRNA gene expression and the number of bacterial operational taxonomic units in all treatments. The unique, core, and shared taxa with low relative abundances may be associated with improved lettuce Nup and lettuce shoot and root biomass at each plant growth stage under different cover crop amendments based on multivariate analysis between plant indicators and bacterial genera groups. This study revealed the importance of bacterial groups with low relative abundance in plant–microbe interactions; such bacteria may promote the cover crop application for high lettuce productivity.
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Data Availability
The raw sequence data were submitted to the NCBI Sequence Read Archive (https://www.ncbi.nih.gov/sra) under BioProject accession PRJNA733680.
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Acknowledgements
We thank Dr. Yoshitaka Uchida in the Research Faculty of Agriculture, Hokkaido University, for his supervision during the experiments and his input to the manuscript. We also thank Prof. Sonoko Dorothea Bellingrath-Kimura from the Leibniz Center for Agricultural Landscape Research (ZALF) and Humboldt University for her critical comments prior to manuscript submission.
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This research was funded by the Grant-in-Aid for Scientific Research of Japan (grant number 18H02310), provided by the Japan Society for the Promotion of Science (JSPS).
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All authors participated in the study conception and design. The research and data collection and analysis were performed by Yufita Dwi Chinta under supervision and validation of Hajime Araki. The original draft of the manuscript was prepared by Yufita Dwi Chinta, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Chinta, Y.D., Araki, H. Cover Crop Amendments and Lettuce Plant Growth Stages Alter Rhizobacterial Properties and Roles in Plant Performance. Microb Ecol 86, 446–459 (2023). https://doi.org/10.1007/s00248-022-02090-w
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DOI: https://doi.org/10.1007/s00248-022-02090-w