Abstract
In this study, the addition of γ-aminobutyric acid (GABA), Bacillus pumilus, or both, was found to enhance rice growth and yield while significantly decreasing arsenic (As) accumulation in Oryza sativa rice tissues. GABA emerged as a regulator of iron (Fe) homeostasis, acting as a signaling modulator that influenced phytosiderophore secretions in the plant. Meanwhile, B. pumilus directly increased Fe levels through siderophore production, promoting the development of Fe-rich rice plants. Subsequently, Fe competed with As uptake at the root surface, leading to decreased As levels and translocation to the grains. Furthermore, the addition of GABA and B. pumilus optimized rice indole-3 acetic acid (IAA) contents, thereby adjusting cell metabolite balance under As stress. This adjustment results in low malondialdehyde (MDA) contents in the leaves and roots during the early and late vegetative phases, effectively reducing oxidative stress. When added to As-contaminated soil, GABA and B. pumilus effectively maintained endogenous GABA levels and exhibited low ROS generation, similar to normal soil. Concurrently, GABA and B. pumilus significantly downregulated the activity of OsLsi1, OsLsi2, and OsABCC1 in roots, reducing As uptake through roots, shoots, and grains, respectively. These findings suggest that GABA and B. pumilus additions impede As translocation through grains, ultimately enhancing rice productivity under As stress.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This project is funded by the National Research Council of Thailand for New Research (NRCT5-TRG63005-02).
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R.D.: conceptualization, data curation, formal analysis, investigation, methodology, validation, writing—original draft; P.T.: resources, supervision, writing—review and editing.
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Dolphen, R., Thiravetyan, P. Exogenous γ-aminobutyric acid and Bacillus pumilus reduce arsenic uptake and toxicity in rice. Environ Sci Pollut Res 31, 10609–10620 (2024). https://doi.org/10.1007/s11356-024-31893-2
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DOI: https://doi.org/10.1007/s11356-024-31893-2