Novel insights of bioinoculants on augmented productivity of Andrographis paniculata Wall. ex Nees

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DOI: 10.1007/s42535-025-01598-z
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Keywords: Plant growth promoting bacteria, Andrographis paniculata, Nitrogen fixing bacteria, Phosphate solubilizing bacteria, Potassium solubilizing bacteria


Abstract


The objective of this study was to investigate the impact of three plant growth promoting bacteria (PGPB), Bacillus subtilis (MTCC 736), Azospirillum brasilense (MTCC 4037) and Pseudomonas fluorescens (MTCC 666) on soil parameters (micro and macro nutrients) and also to evaluate their ability in promoting the growth and nutrients of Andrographis paniculata (CIM “Megha”) plants, grown in that soil. Under this study, positive effects of PGPB strains on Sulfur (S), Zinc (Zn), Boron (B), Iron (Fe), Manganese (Mn), Copper (Cu), Nitrogen (N), Phosphorus (P) and Potassium (K) contents of the soil were evaluated. These PGPB significantly decreased the pH of the soil, resulting in elicitation of the nitrification and organic acid production, in order to increase nitrogen fixation, P and K solubilization. Among all the treatments, dual inoculations of B. subtilis + P. fluorescens increased plant height, number of leaf, number of lateral branches, fresh and dry herbal yield in a pot experiment, as well as N, P and K uptake in the leaf, when compared to the control. The NPK results of both, soil and plants indicate that the values of all measured parameters were higher, when (A) paniculata was dually inoculated with (B) subtilis + P. fluorescens. Based on our results, these PGPB can be used as Nitrogen Fixing Bacteria (NFB), Phosphate Solubilizing Bacteria (PSB) and Potassium Solubilizing Bacteria (KSB) to enhance growth and also can be worthy for commercial development and sustainable production.

Plant growth promoting bacteria, Andrographis paniculata, Nitrogen fixing bacteria, Phosphate solubilizing bacteria, Potassium solubilizing bacteria


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Author Information


Microbial Biodiversity Laboratory, Department of Botany, Patna University, Patna, Bihar, India