Abstract
Aims
There is a growing interest in the use of microbials in sustainable protected cultivation systems. A novel study on the influence of chili residue and plant growth-promoting rhizobacteria (PGPR) interaction was conducted to investigate the agronomic response of a greenhouse-grown leaf mustard (Brassica juncea L.), as well as the soil productivity.
Methods
Bacillus subtilis (B1), B. laterosporus (B2), or B. amyloliquefaciens (B3) was inoculated on soil containing chili residue in a solar greenhouse. Other treatments were chili residue alone (NoPGPR) and chemical fertilizer (ChemFert). The crop photosynthesis, growth, yield, and quality, the soil chemical properties, microbial biomass, and the rhizospheric bacterial community were evaluated.
Results
Residue and PGPR synergy significantly enhanced the leaf mustard’s productivity and soil quality than NoPGPR and ChemFert. B1, B2, and B3 improved the crop yield by 51–63% than NoPGPR and ChemFert. They also increased the net photosynthetic rate, plant uptakes of N, P, K, Mg, Ca, Mn, Zn, and soil microbial quotient than NoPGPR and ChemFert, which comparatively elicited lower leaf chlorophyll-a, total soluble solids, nutrients uptakes compared to the PGPR treatments. Residue and B. laterosporus synergy markedly improved the soil organic carbon, total nitrogen, microbial carbon contents, and the microbial quotient. Further, 16S rRNA high throughput sequencing revealed that inoculating chili residue with B. laterosporus more consistently enriched the rhizospheric bacterial community composition at the phylum and genus levels, although with a lower diversity.
Conclusions
Inoculating chili residue with B. laterosporus is a strategy with immense benefits as a bio-fertilizer for sustainable vegetable production, which also renders soil ecological services.
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Data availability
Raw sequencing data were deposited in the NCBI Sequence Read Archive (SRA) database and accordingly referenced in the manuscript. Other datasets generated during the current study are available from the corresponding author on reasonable request.
Code availability
Not applicable.
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Acknowledgements
This study was supported by Modern Agro-industry Technology Research System (Grant Number CARS-24-B-04 and CARS-25-C-01); The Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences (CAAS-ASTIP-IVFCAAS); and The Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, P. R. China.
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Ibraheem Olamide Olasupo: Conceptualization, Methodology, Investigation, Data curation, Formal analysis, Visualization, Writing – original draft, review, and editing. Jun Wang: Methodology, Resources, Writing – review and editing. Xiaoxuan Wei: Methodology, Investigation, Resources. Mingtao Sun: Resources, Formal analysis, Writing – review and editing. Yan Yan: Project administration, Resources. Yansu Li: Project administration, Resources. Xianchang Yu: Conceptualization, Fund acquisition, Resources. Chaoxing He: Conceptualization, Fund acquisition, Resources, Supervision, Writing – review and editing.
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Olasupo, I.O., Wang, J., Wei, X. et al. Chili residue and Bacillus laterosporus synergy impacts soil bacterial microbiome and agronomic performance of leaf mustard (Brassica juncea L.) in a solar greenhouse. Plant Soil 479, 185–205 (2022). https://doi.org/10.1007/s11104-022-05504-3
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DOI: https://doi.org/10.1007/s11104-022-05504-3