ArticlePlant and soil2026
Elemental profiling reveals rhizosphere oxidation-mediated selective Fe exclusion mechanisms against Fe toxicity in rice in Madagascar.
Article in Plant and soil, 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
Background and aims: Iron (Fe) toxicity in lowland rice is caused by high Fe levels and mineral imbalances within plants. Thus, maintaining whole-plant mineral balance may be crucial for tolerance. However, there is limited evidence from field studies on elemental profiling that elucidates specific tolerance mechanisms. Here, we tested whether contrasting Fe tolerance mechanisms are associated with distinct patterns of nutrient uptake and distribution. Methods: We conducted multi-season experiments in Fe-toxic fields in Madagascar using rice genotypes with contrasting tolerance mechanisms. Elemental profiling was conducted for different parts of shoot tissues. Belowground Fe dynamics were investigated by measuring Fe plaque formation on roots and rhizosphere Fe Results: During the vegetative stages, tolerant genotypes that maintain low shoot Fe concentrations (excluders) showed a 48% reduction in shoot Fe uptake compared to other genotypes, while the uptake of other nutrients was less affected. Tolerant genotypes showed distinct within-plant nutrient allocation patterns. Excluders maintained lower Fe Conclusion: Genotypes with different tolerance levels and mechanisms exhibited distinct elemental profiles throughout growth. Genotypes with the same tolerance strategy may rely on distinct physiological mechanisms. Excluders selectively excluded Fe compared to other elements likely mediated by rhizosphere Fe oxidation. Supplementary Information: The online version contains supplementary material available at https://doi.org/10.1007/s11104-026-08919-4.
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