Root Iron Plaque on Wetland Plants as a Dynamic Pool of Nutrients and Contaminants

Khan, N.; Seshadri, Balaji; Bolan, Nanthi; Saint, Christopher P.; Kirkham, M.B.; Chowdhury, Saikat; Yamaguchi, Noriko; Lee, Dar‐Yuan; Li, Guilin; Kunhikrishnan, Anitha; Qi, Fang; Karunanithi, Rajasekar; Qiu, Rongliang; Zhu, Yan; Syu, Chien-Hui

doi:10.1016/bs.agron.2016.04.002

Cited by 136 publications

(77 citation statements)

References 261 publications

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“…Obviously, Fe(II) in the soil pore water was directly oxidised and hydrolysed to ferric (hydr)oxide at rice root surfaces [5,10] with some discontinuous organic matter retention through co-precipitation. Between 5-10 µm from the root cell, 27 Al 16 O − / 16 O − enrichments were found at the interface to the silicate-containing zone (Figures 7 and 8). Since this thin layer is free of 28 Si − / 16 O − , this observation supports the idea of mineral weathering as the likely Al source.…”

Section: Element Distribution From the Periphery Of The Root Into Thementioning

confidence: 99%

“…The spatial distribution of organic material was measured as the molecular secondary ion 12 28 Si − signals at distinct areas are indicative for quartz. Thus, to distinguish between organic material and different mineral particles (oxides, phyllosilicates, and quartz), we simultaneously detected 12 C 14 N − , 28 Si − , 27 Al 16 O − , and 56 Fe 16 O − within selected, representative cross sections of two root channels. 12 C − and 16 O − were measured as indicators for resin and mineral phase, respectively.…”

Section: Sample Preparation Microscopy and Nanosims Analysismentioning

confidence: 99%

“…Some oxide-encrusted root cells have been identified at the periphery of the root channel. Root cells were identified with reflected-light microscope images by their shape, their physiological features, and their reoccurring location around the root channels (see microscope images of rice root cross sections in Khan et al [27]). The positions of the three consecutive NanoSIMS measurements were highlighted by three dotted rectangles in Figures 3 and 4, representing transect 1, 2, and 3.…”

Section: Distribution Of Fe Al Si and Organic C In Transects From mentioning

confidence: 99%

“…These are most likely residues of former rhizodermis cells (see microscope images of rice root cross sections in Khan et al [27]). On the left side of the transects (Figures 6-8 28 Si − / 16 O − within the root cells.…”

Section: Oxide-encrusted Root Cellsmentioning

confidence: 99%

“…Since this thin layer is free of 28 Si − / 16 O − , this observation supports the idea of mineral weathering as the likely Al source. Al-organic-complexes are then formed and appear as a thin layer on phyllosilicates [31], which are identified by the presence of 27 [32]. The depletion of 28 Si − / 16 O − in the 0-10 µm zone can be explained by Si uptake by rice plants [33].…”

Section: Element Distribution From the Periphery Of The Root Into Thementioning

confidence: 99%

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Legacy of Rice Roots as Encoded in Distinctive Microsites of Oxides, Silicates, and Organic Matter

Kölbl

Schweizer

Mueller

et al. 2017

Soils

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Rice (Oryza sativa) is usually grown under flooded conditions, leading to anoxic periods in the soil. Rice plants transport oxygen via aerenchyma from the atmosphere to the roots. Driven by O 2 release into the rhizosphere, radial gradients of ferric Fe and co-precipitated organic substances are formed. Our study aimed at elucidating the composition and spatial extension of those gradients. Air-dried soil aggregates from a paddy field were embedded in epoxy resin, cut, and polished to produce cross sections. Reflected-light microscopy was used to identify root channels. With nano-scale secondary ion mass spectrometry (NanoSIMS), we investigated transects from root channels into the soil matrix and detected 12 C − , 16 28 Si − only occurs at distances larger than approximately 10 µm from the root surface. Thus, we can distinguish distinct zones: the inner zone is composed of oxide encrusted root cells and their fragments. A thin intermediate zone may occur around some roots and comprises (hydr)oxides and organic matter. This can be distinguished from a silicate-dominated outer zone, which reflects the transition from the rhizosphere to the bulk soil.

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Section: Element Distribution From the Periphery Of The Root Into Thementioning

confidence: 99%

Section: Sample Preparation Microscopy and Nanosims Analysismentioning

confidence: 99%

Section: Distribution Of Fe Al Si and Organic C In Transects From mentioning

confidence: 99%

Section: Oxide-encrusted Root Cellsmentioning

confidence: 99%

Section: Element Distribution From the Periphery Of The Root Into Thementioning

confidence: 99%

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Legacy of Rice Roots as Encoded in Distinctive Microsites of Oxides, Silicates, and Organic Matter

Kölbl

Schweizer

Mueller

et al. 2017

Soils

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Iron Plaque Prevents Partitioning of Polycyclic Aromatic Hydrocarbons on Rice (Oryza sativa) Root Surface

Nie

Zhang

et al. 2020

Integr Envir Assess & Manag

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Adsorption of polycyclic aromatic hydrocarbons (PAHs) on root surfaces has essential impacts on PAH phytoremediation. An Fe plaque is commonly formed on the root surface of aquatic plants. Therefore, it is worth investigating the impact of the Fe plaque on PAH adsorption on rice root surfaces. Using Bayesian linear water-methanol cosolvent models, we estimated accurate water-biosorbent partition coefficient values for phenanthrene, pyrene, and benzo[a]pyrene between water and rice root biosorbent fractions, including rice root materials with Fe plaque, removed Fe plaque, and removed Fe plaque and lipids. Our results showed that Fe plaque inhibited the adsorption of PAHs on rice root surface; the inhibition impacts increased with hydrophobicity of PAHs. This result highlights the need for considering the impact of Fe plaque on PAH adsorption during phytoremediation. Integr Environ Assess Manag 2020;16:392-399. © 2020 SETAC

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Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Tripaldi,

Ozán,

Heider

et al. 2024

J Quaternary Science

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Stabilized and active dunes and sand sheet deposits abound in a small lake‐dotted semi‐arid region of the Western Pampean Dunefield, Argentina. Here, a multi‐scale and multi‐proxy study of three sites, across a hydrologic gradient from lakes to a dryland with groundwater levels at more than 25 m depth, analyzes calcareous and ferruginous rhizoliths, calcareous crusts, hypocoatings, pedogenic carbonate and amorphous Mn‐oxide precipitates within blowout dunes. These palustrine‐related features indicate significantly wetter conditions that allowed the development of shallow lakes and expanding wetlands during the Pleistocene–Holocene transition, limited by associated optically stimulated luminescence ages between ca. 14.7 and 11.6 ka. These wetter conditions, also identified in other nearby proxy records, may be associated with a strengthened South American Monsoon System, potentially during the Younger Dryas Chronozone, though other geological, ecological and climatic forcings cannot be ruled out with available data. Such a scenario lacks a modern analogue, since current hydrologic excess, evidenced in the formation of lakes and new rivers, is not observed in the localities which record paleolakes. This study underlines the variable conditions for pronounced hydrologic excess in semi‐arid eolian environments in western Argentina with complex ecological, anthropogenic and climatic linkages.

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Root Iron Plaque on Wetland Plants as a Dynamic Pool of Nutrients and Contaminants

Cited by 136 publications

References 261 publications

Legacy of Rice Roots as Encoded in Distinctive Microsites of Oxides, Silicates, and Organic Matter

Legacy of Rice Roots as Encoded in Distinctive Microsites of Oxides, Silicates, and Organic Matter

Iron Plaque Prevents Partitioning of Polycyclic Aromatic Hydrocarbons on Rice (Oryza sativa) Root Surface

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

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