Factors affecting iron plaque on the roots ofPhragmites australis (Cav.) Trin. ex Steudel

St-Cyr, Louise; Crowder, Adèle A.

doi:10.1007/bf02327260

Cited by 52 publications

(25 citation statements)

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“…The amounts of iron plaque on the root surfaces of rice were approximately 8-10 g kg −1 at Fe0 and 45-48 g kg −1 at Fe50, which fell within the range (the lowest ∼0.15 g kg −1 and the highest ∼59 g kg −1 ) reported for other wetland plants (St-Cyr and Crowder 1989;Hansel et al 2002) and rice (∼25-102 g kg −1 , Chen et al 1980b) in the field. Uptake of nutrient elements and/or metal(loids) can be mediated by the formation of ion plaque on root surfaces of wetland and some terrestrial plants.…”

Section: Discussionsupporting

confidence: 74%

Influence of external zinc and phosphorus supply on Cd uptake by rice (Oryza sativa L.) seedlings with root surface iron plaque

et al. 2007

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Section: Discussionsupporting

confidence: 74%

Influence of external zinc and phosphorus supply on Cd uptake by rice (Oryza sativa L.) seedlings with root surface iron plaque

et al. 2007

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“…It should also be noted that the Fe formation on root surfaces can be influenced by many abiotic factors such as the availability of soil Fe, temperature, pH, CO 2 , soil permeability, etc. (Chen et al 1980;St-Cyr and Crowder 1988), as well as biotic factors, including ROL and rhizosphere bacteria (St-Cyr and Crowder 1989;Chen et al 2008). Mendelssohn et al (1995) reported that ROL is the most important biotic factor controlling Fe plaque formation.…”

Section: Discussionmentioning

confidence: 99%

Radial oxygen loss has different effects on the accumulation of total mercury and methylmercury in rice

Wang

Li²,

Tam

et al. 2014

Plant Soil

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Background and Aims Mercury (Hg) pollution in paddy fields and rice has aroused great concern in recent years. This study investigated the dynamic changes of radial oxygen loss (ROL) and Fe plaque formation on roots, and their effects on Hg accumulation in rice plants. Methods A rhizobag experiment was conducted to study temporal variations and correlations between ROL (amounts and rates), Fe plaque formation, total Hg (THg) and methylmercury (MeHg) in plant tissues and in plaque of four rice cultivars during six growth stages.Results ROL amounts and Fe plaque formation increased from tillering to reproductive stages, then ROL amounts gradually decreased until maturation stage, whereas Fe plaque remained relatively stable. ROL rates continued to decline during the entire growth period. Both ROL amounts and Fe concentrations in plaque were positively correlated with THg concentrations in the plaque, whereas negatively correlated with THg in straw and brown rice. However, there were no significant relationships between ROL, Fe in plaque and MeHg in plaque and in plant tissues.Plant Soil (2014) 385:343-355 DOI 10.1007/s11104-014-2239-x Responsible Editor

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“…Differences in plaque penetration of the root may result from variance in the extent of the oxidized rhizosphere due to differential root radial oxygen loss among species (or between experiments with the same species), differences in root respiration, and/or different soil oxygen demands of the rooting medium (Takijima 1965, Armstrong 1971, St-Cyr and Crowder 1989. The distribution of iron plaque formation on the root appears to match the regions of the root where intense radial oxygen loss occurs.…”

Section: Mineralogy and Formation Of Oxidized Root Channelsmentioning

confidence: 99%

Factors controlling the formation of oxidized root channels: A review

1995

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Although root plaques and associated oxidized root channels are used for wetland identification as field indicators of wetland hydrology, little information is available concerning their reliability as related to the environmental and biotic factors controlling their formation. Therefore, this review describes and evaluates the current state of know/edge of the factors controlling the formation of iron plaques and recommends research to address information gaps.Both abiotic and biotic factors control the presence and degree of iron plaque formation. The most important abiotic factor is the availability of soil iron. However, the effect of site variation in soil physico-chemical characteristics (e.g., texture, organic matter, pH, Eh, and soil fertility) on iron availability and microbial activity can influence the formation and persistence of root plaques and oxidized root channels. Although the oxidizing capacity of the plant root is the most important biotic factor controlling plaque formation, only a limited number of wetland species have been evaluated for this ability, so species-specific differences are generally unknown.Unlike some of the other hydrologic indicators used in wetland delineation (e,g., water marks on trees or sediment deposits) root plaques and oxidized root channels indicate soil saturation for a sutficient period to produce anaerobic soil conditions. Additionally, when found in conjunction with a living root, oxidized root channels indicate that the anaerobic conditions occurred within the life span of the plant root. Therefore, the presence of oxidized root channels and iron plaque surrounding living roots is a relatively good indicator of current wetland hydrologic conditions. However, research is needed to elucidate the relative abilities of different plant species to produce oxidized root channels, the temporal persistence of the root iron plaque and the role that soil physieo-chemical condition plays in controlling plaque formation, Without a better understanding of the controls on iron plaque formation and disappearance, the absence of oxidized root channels, in itself, should not be used to indicate the absence of a wetland.

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Factors affecting iron plaque on the roots ofPhragmites australis (Cav.) Trin. ex Steudel

Cited by 52 publications

References 24 publications

Influence of external zinc and phosphorus supply on Cd uptake by rice (Oryza sativa L.) seedlings with root surface iron plaque

Influence of external zinc and phosphorus supply on Cd uptake by rice (Oryza sativa L.) seedlings with root surface iron plaque

Radial oxygen loss has different effects on the accumulation of total mercury and methylmercury in rice

Factors controlling the formation of oxidized root channels: A review

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