Abstract
The present study aims to characterize the plant growth-promoting bacterial traits of Bacillus simplex (strain 115). This bacterium was inoculated in hydroponically conditions to improve pea (Pisum sativum L.) growth submitted to lead (Pb) toxicity. Root nodulation system was developed enough in 23-day-old plants attesting the interaction between the two organisms. In addition to its phosphate solubilization and siderophore production traits that reached 303.8 μg P mL−1 and 49.6 psu respectively, the Bacillus strain 115 exhibited Pb bio-sorption ability. Inoculation of Pb-stressed pea with strain 115 showed roots and shoots biomass recovery (+ 70% and + 61%, respectively). Similarly, water and protein contents were increased in Pb-treated plants after bacterial inoculation. In the presence of strain 115, Pb relative toxicity level decreased (− 39.3% compared to Pb stress only). Moreover, catalase and superoxide dismutase activities were upregulated in Pb-exposed plants (+ 56% and + 51%, respectively). After inoculation with strain 115, catalase and superoxide dismutase activities were restored by − 38% and − 44% respectively. Simultaneously, oxidant stress indicator (H2O2 and 4-hydroxynonenal) and osmo-regulators (proline and glycine-betaine) contents as well as lipoxygenase activity decreased significantly in Pb-treated plants after Bacillus strain’s inoculation. Taken together, the results give some evidences for the plant growth-promoting capacity of strain 115 in helping alleviation of Pb stress.
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We gratefully acknowledge Abbes Wacharine and Amira Yakoubi for technical help.
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AC: conceptualizalization, methodology, formal analysis, investigation, writing; OK: statistical analysis, help in methodology; CF: heavy metal measurements; RDL: help in methodology, reviewing; KKB: reviewing; WD: advices in methodology, reviewing; RC: conceptualization, writing, data curation, supervision.
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Chamekh, A., Kharbech, O., Fersi, C. et al. Insights on strain 115 plant growth-promoting bacteria traits and its contribution in lead stress alleviation in pea (Pisum sativum L.) plants. Arch Microbiol 205, 1 (2023). https://doi.org/10.1007/s00203-022-03341-7
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DOI: https://doi.org/10.1007/s00203-022-03341-7