Location of radial oxygen loss and zones of potential iron uptake in a grass and two nongrass emergent species

Conlin, Timothy S. S.; Crowder, Adèle A.

doi:10.1139/b89-095

Cited by 59 publications

(38 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Strong sequestration of As in iron plaque may be a predominant process controlling As uptake by rice roots. However, these results should be viewed with care, since the amounts of iron plaque formed on root surface of rice plants grown in soil varied between root sections (Conlin and Crowder, 1989;Liu et al, 2005), and also between different growth stages even on the same root. Furthermore, Si application may promote the oxidation power of rice roots, which may lead to more deposition of iron oxides on the root surface under field conditions (Okuda and Takahashi, 1962;Cheng, 1982).…”

Section: Discussionmentioning

confidence: 99%

Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Guo

Zhu

Liu

et al. 2007

Environmental Pollution

View full text Add to dashboard Cite

Arsenate uptake by rice seedlings is affected by both Si (internal and external) and iron plaque on root surface. AbstractSolution culture experiments were conducted to investigate the effects of silicon (Si) on arsenate (As V ) uptake by rice. The addition of Si to the pretreatment or uptake solution significantly decreased shoot and root As concentrations (P < 0.001 and P < 0.05). The presence of Si in the pretreatment or uptake solution also significantly decreased shoot P concentrations (P < 0.001). The data demonstrated that both internal and external Si inhibited the uptake of As and P. Results of As uptake kinetics showed that the mechanism of the effect of Si on arsenate uptake is not caused by direct competition for active sites of transporters with As. The effect of Si on As uptake was not entirely mediated through the effect of Si on P uptake. Although the addition of Si to pretreatment solutions still significantly decreased shoot and root As concentrations, the extent of reduction became smaller when rice roots were coated with iron plaque.

show abstract

Section: Discussionmentioning

confidence: 99%

Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Guo

Zhu

Liu

et al. 2007

Environmental Pollution

View full text Add to dashboard Cite

show abstract

“…of wetland plants are known to form so-called iron Tolerance of wetland plants to high ferrous iron plaque on their roots by oxidizing Fe^"^ to Fe^"^ concentrations is associated with oxidation in the resulting from the oxidizing activity of the plant rhizosphere (Bartlett, 1961;Green & Ftherington, roots and associated micro-organisms (Chen, Dixon 1977;Johnson-Green & Crowder, 1991;Wang & & Turner, 1980;Mendelssohn & Postek, 1982;Peverly, 1996). Oxidation in the rhizosphere might Taylor, Crowder & Rodden, 1984;McLaughlin, van also diminish the toxicity of other reduced subLoon & Crowder, 1985;Conlin & Crowder, 1989; stances such as Mn^+ and S'^" (Armstrong, 1967;Otte et al, 1989;St-Cyr & Crowder, 1990;Crowder Chen et al, 1980;Armstrong, Brandle & Jackson, & St-Cyr, 1991). Recently, with reference to the 1994; Smolders & Roelofs, 1996).…”

Section: Introductionmentioning

confidence: 99%

Copper and nickel uptake, accumulation and tolerance in Typha latifolia with and without iron plaque on the root surface

et al. 1997

View full text Add to dashboard Cite

SUMMARYThe effects of iron plaque on the growth of Typha latifolia L. and accumulation of copper and nickel in T. latifolia were investigated under laboratory conditions in nutrient solution cultures. Seedlings with and without iron plaque on their roots were exposed to 0-05 //^g ml"^ Cu and 010 //g m\~^ Ni solutions for 72 d. The results showed no differences in root and shoot d. wt and leaf elongation when Cu or Ni were added to the solution and in the presence or absence of plaque. However, root length was reduced by Cu and Ni, and the reduction in root length was greater in the presence of plaque. Some Cu and Ni was adsorbed on root surfaces; roots with plaque took up more Cu, but less Ni than those without. The presence of plaque did not alter Cu uptake and translocation but increased Ni uptake and translocation. Most of the Cu and Ni taken up was retained in the roots, suggesting that the root tissue rather than the root surface or plaque is the main barrier for Cu and Ni transport. The results differ from those reported for other species.

show abstract

“…High ROL was observed for E. angustifolium (59), while C. rostrata appeared to lose O 2 only at the distal and lateral root zones (60). Although the steady-state concentrations of O 2 in pore water were comparable at our three study locations, higher O 2 levels along the root systems of E. angustifolium possibly influenced the differences observed in the methanotrophic communities.…”

Section: Discussionmentioning

confidence: 62%

Methanotrophic and Methanogenic Communities in Swiss Alpine Fens Dominated by Carex rostrata and Eriophorum angustifolium

Cheema

Zeyer

Henneberger

2015

Appl Environ Microbiol

View full text Add to dashboard Cite

Vascular plants play a key role in controlling CH 4 emissions from natural wetlands, because they influence CH 4 production, oxidation, and transport to the atmosphere. Here we investigated differences in the abundance and composition of methanotrophic and methanogenic communities in three Swiss alpine fens dominated by different vascular plant species under natural conditions. The sampling locations either were situated at geographically distinct sites with different physicochemical properties but the same dominant plant species (Carex rostrata) or were located within the same site, showing comparable physicochemical pore water properties, but had different plant species (C. rostrata or Eriophorum angustifolium). All three locations were permanently submerged and showed high levels of CH 4 emissions (80.3 to 184.4 mg CH 4 m ؊2 day ؊1 ). Soil samples were collected from three different depths with different pore water CH 4 and O 2 concentrations and were analyzed for pmoA and mcrA gene and transcript abundance and community composition, as well as soil structure. The dominant plant species appeared to have a significant influence on the composition of the active methanotrophic communities (transcript level), while the methanogenic communities differed significantly only at the gene level. Yet no plant species-specific microbial taxa were discerned. Moreover, for all communities, differences in composition were more pronounced with the site (i.e., with different physicochemical properties) than with the plant species. Moreover, depth significantly influenced the composition of the active methanotrophic communities. Differences in abundance were generally low, and active methanotrophs and methanogens coexisted at all three locations and depths independently of CH 4 and O 2 concentrations or plant species.T he atmospheric concentration of the highly potent greenhouse gas methane (CH 4 ) has increased over the past several decades to a current value of ca. 1.8 ppm by volume (ppmv) and is continuing to rise after an apparent stagnation in the early 2000s (1). Natural wetlands are the most important nonanthropogenic CH 4 source, with estimated emissions of 177 to 284 Tg year Ϫ1 , accounting for 26 to 42% of the global CH 4 budget (2). Wetlands in northern high latitudes (north of 45°N) contribute approximately 44.0 to 53.7 Tg CH 4 year Ϫ1 (3). The CH 4 cycle in these environments is driven by microorganisms: methanogenic archaea (methanogens) generate CH 4 in the anoxic zones of the wetland soil as the terminal step of anaerobic degradation of organic matter. These microorganisms represent a monophyletic euryarchaeal lineage and largely utilize hydrogen or carbon dioxide, acetate, or small methylated compounds as substrates (4, 5). On the other hand, a substantial amount of CH 4 generated in wetlands is oxidized before it can reach the atmosphere by aerobic methaneoxidizing bacteria (methanotrophs), which are active mainly at the oxic-anoxic interface (6). These organisms can utilize CH 4 as the sole energy and carbon...

show abstract

Location of radial oxygen loss and zones of potential iron uptake in a grass and two nongrass emergent species

Cited by 59 publications

References 28 publications

Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Copper and nickel uptake, accumulation and tolerance in Typha latifolia with and without iron plaque on the root surface

Methanotrophic and Methanogenic Communities in Swiss Alpine Fens Dominated by Carex rostrata and Eriophorum angustifolium

Contact Info

Product

Resources

About