Iron dynamics in the rhizosphere as a case study for analyzing interactions between soils, plants and microbes

By P. Lemanceau, P. Bauer, S. Kraemer, J. Briat. Plant and Soil, 2009

189 citations recorded by the source corpus.

Iron is an essential element for plants and microbes. However, in most cultivated soils, the concentration of iron available for these living organisms is very low because its solubility is controlled by stable hydroxides, oxyhydroxides and oxides. In the rhizosphere, there is a high demand of iron because of the iron uptake by plants, and microorganisms which density and activity are promoted by the release of root exudates. Plants and microbes have evolved active strategies of iron uptake. Iron incorporation by these organisms lead to complex interactions ranging from competition to mutualism. These complex interactions are under the control of physico-chemical properties of the soils in which they occur, and reciprocally iron uptake strategies of plants and microbes impact these soil properties. These iron-mediated interactions between soils, plants and microbes impact the plant growth and health and their analysis, together with that of the resulting iron dynamics, is of a major agronomic interest. Analysis of the complex interactions soils, plants and microbes represent also a unique opportunity to progress in our knowledge of the rhizosphere ecology. This progression requires merging complementary expertises and study strategies in soil science, plant biology and microbiology. This review provides information on (i) iron status in soil and rhizosphere, iron uptake by plants and microbes, and on (ii) the corresponding study strategies. Finally, illustrations of how integration of these approaches allows gaining knowledge in the complex interactions occurring in the rhizosphere are given.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/c4dcec3f0cd0b3c33b1604f15227bd8026a651a4

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Citations in the corpus

• Plant growth-promoting bacteria as inoculants in agricultural soils (2015, background): “Under aerobic conditions, iron solubility is low, reflecting the predominance of Fe3+ typically observed as oxyhydroxide polymers, thereby limiting the Fe supply for different forms of life, particularly in calcareous soils (Andrews et al., 2003; Lemanceau et al., 2009).”
• Mechanisms Used by Plant Growth-Promoting Bacteria (2011, background): “The iron dynamics in the rhizosphere are under the control of the combined effects of soil properties and plant and microbially produced compounds (Robin et al. 2008; Lemanceau et al. 2009).”
• Ecophysiology of iron homeostasis in plants (2016, background): “This low-affinity mechanism (which is not regulated by the presence of iron) also transports cobalt, cadmium and nickel (Lemanceau et al. 2009; Marschner et al. 2011; Shi et al. 2011; Nagata et al. 2013).”
• Plant Growth Promotion by Microbes (2013, background): “Siderophore producer Lemanceau et al. (2009); see Chapter 113”
• Characterization of plant growth-promoting bacteria associated with rice cropped in iron-stressed soils (2014, unknown): “In aerobic conditions, the solubility of iron is very low due to the predominance of ferric (Fe) ions usually found as oxihydroxide polymers, thereby limiting the iron supply for plant uptake, especially in calcareous soils (Andrews et al. 2003; Lemanceau et al. 2009).”
• Rhizosphere: biophysics, biogeochemistry and ecological relevance (2009, background): “The most nutrient-efficient microorganisms are thereby efficiently selected in the rhizosphere (Marschner et al. 2006; Calvaruso et al. 2007; Robin et al. 2008; Lemanceau et al 2009).”
• The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms. (2013, background): “Various studies have proposed an additional strategy of iron acquisition by plants involving the use of iron chelated to microbial siderophores (Marschner & R€omheld, 1994; Vansuyt et al., 2007; Lemanceau et al., 2009a, b).”
• Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms (2009, background): “Although the rhizosphere is important for the efficient uptake of a wider range of macro and micronutrients (including Fe; Lemanceau et al. 2009), the review specifically focuses on N and P which are key nutrients that limit sustainable agricultural production across much of the globe (Tilman et…”
• Effect of Trichoderma asperellum strain T34 on iron, copper, manganese, and zinc uptake by wheat grown on a calcareous medium (2011, background): “Rhizosphere microbial communities contribute to nutrient cycling, plant growth, and root health (Yang and Crowley 2000; Lemanceau et al. 2009).”
• Rhizospheric organic compounds in the soil–microorganism–plant system: their role in iron availability (2014, background): “Plant organic exudates operate through Fe complexation mechanisms as well as low-molecular-weight Fe-binding molecules (microbial siderophores, MSs) (see the review by Lemanceau et al., 2009), released by microorganisms in the rhizosphere.”