Abstract
Background and aims
Forage legumes form mutualistic interactions with specialized soil rhizobia bacteria that inhabit root nodules and fix atmospheric nitrogen. However, legumes are sensitive to drought stress, which can interrupt nodulation and symbiotic nitrogen fixation (SNF). We hypothesize that drought-impaired SNF may influence soil nitrogen availability and soil microbial diversity.
Methods
Here, we evaluated the effects of drought on nodulation, plant growth, physiological parameters, SNF, soil nitrogen availability, soil extracellular enzyme activity, and soil microbiome of alfalfa (Medicago sativa) and red clover (Trifolium pratense). The drought treatments were imposed at the flowering stage by maintaining soil moisture contents at 20% field capacity (FC) (severe drought), 40% FC (moderate drought), and 80% FC (well-watered) for three weeks.
Results
Drought significantly reduced nodulation, root and shoot growth, and SNF in alfalfa and red clover. Soil available nitrogen was significantly increased following severe drought conditions. The enzyme assays showed reduced activity of N-acetyl-glucosaminidase and β-D cellobiosidase enzymes under drought stress in alfalfa and red clover, respectively. Microbiome data showed shifts in the relative abundance of some key bacterial taxa under drought stress.
Conclusion
Overall results indicate that drought has deleterious effects on SNF and plant growth, affecting carbon and nitrogen cycling enzymes, soil nitrogen availability, and soil microbial diversity.
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Data availability
All data pertinent to this work are included in the article and the Supplementary files.
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Thanks to the Department of Science and Technology of the Republic of the Philippines for providing graduate students with scholarship opportunities such as the DOST-SEI UAlberta S&T Graduate Scholarship.
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This research was supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant (RGPIN-2020-04425) to MST.
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MST, DD, and CC conceptualized and designed the research. DD performed the experiments and collected data. MST, CC and KS provided resources. DD, RAL and BH performed formal data analysis. DD and RAL performed the data analysis and visualization. DD wrote the original draft. All the authors contributed to the review and editing of the manuscript. MST acquired the funding.
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Dollete, D., Lumactud, R.A., Carlyle, C.N. et al. Effect of drought stress on symbiotic nitrogen fixation, soil nitrogen availability and soil microbial diversity in forage legumes. Plant Soil 495, 445–467 (2024). https://doi.org/10.1007/s11104-023-06348-1
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DOI: https://doi.org/10.1007/s11104-023-06348-1