ArticleWorld journal of microbiology & biotechnology2026
The co-fermentation water-dispersible granules of two PGPR strains enhances growth, yields and quality of pepper by increasing soil nutrients and changing soil bacterial community.
Article in World journal of microbiology & biotechnology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To ensure the sustainable development of Guizhou’s pepper industry, there is an urgent need for innovative microbial fertilizers that can reduce the reliance on chemical fertilizers. This study presents a novel water-dispersible granule (WDG) formulation derived from co-fermented plant growth-promoting rhizobacteria (PGPR) and evaluates its potential to enhance pepper yield, improve nutritional quality, and promote soil health. The optimization of the co-fermentation medium and formulation for Burkholderia pyrrocinia P10 and Bacillus flexus HGD12 was conducted using single-factor experiments and response surface methodology. This process yielded a P10-HGD12 WDG with exceptional performance, characterized by a viable count of 6.78 × 108 CFU/g, a wetting time of 21.19 s, and a suspension rate of 81.33%. In pot trials, the P10-HGD12 WDG treatment produced a significantly higher pepper yield (60.04%) compared to the 100% chemical fertilizer treatment, along with increased concentrations of key nutraceuticals: ascorbic acid (51.79%), total phenolics (130.08%), and total flavonoids (77.63%).The treatment enhanced the abundances of Actinobacteriota and Myxococcota, as well as soil organic matter and available nitrogen content, during both the seedling and fruit-setting stages. In the full-fruit stage, the P10-HGD12 WDG treatment enriched beneficial bacteria positively correlated with pepper growth and nutritional indices, including Actinobacteriota, Gemmatimonadota, unidentified_Gemmatimonadaceae, Luteimonas, and Lysobacter, while simultaneously improving soil nutrient availability and utilization. The P10-HGD12 WDG + 80% chemical fertilizer treatment exhibited secondary efficacy, with the specifically enriched bacterial phyla demonstrating significant correlations with soil nutrient indicators, fruit growth, and nutritional parameters. This study effectively addresses the dual challenge of enhancing soil health while improving crop yield and quality, thereby providing a viable strategy for sustainable agricultural systems.
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