Roles for root iron plaque in sequestration and uptake of heavy metals and metalloids in aquatic and wetland plants

Tripathi, Rudra Deo; Tripathi, Preeti; Dwivedi, Sanjay; Kumar, Amit; Mishra, Aradhana; Chauhan, Puneet Singh; Norton, Gareth J.; Nautiyal, Chandra Shekhar

doi:10.1039/c4mt00111g

Cited by 182 publications

(76 citation statements)

References 111 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In tolerant genotypes, excess iron is known to precipitate on roots, forming an iron plaque that acts as a barrier against iron while ensuring the utilization of essential nutrients by those plants (a process known as indirect iron toxicity). In contrast, an imbalance of nutrients has been observed in susceptible plants growing in soils with toxic levels of iron [48,57,58]. The critical concentration of iron toxicity symptoms varies from 10 to 500 mg/L depending on the nutrient status in the plants and the presence of the reduction products in the environment [51].…”

Section: Iron Toxicitymentioning

confidence: 98%

Breeding Maize for Tolerance to Acidic Soils: A Review

et al. 2018

View full text Add to dashboard Cite

Acidic soils hamper maize (Zea mays L.) production, causing yield losses of up to 69%. Low pH acidic soils can lead to aluminum (Al), manganese (Mn), or iron (Fe) toxicities. Genetic variability for tolerance to low soil pH exists among maize genotypes, which can be exploited in developing high-yielding acid-tolerant maize genotypes. In this paper, we review some of the most recent applications of conventional and molecular breeding approaches for improving maize yield under acidic soils. The gaps in breeding maize for tolerance to low soil pH are highlighted and an emphasis is placed on promoting the adoption of the numerous existing acid soil-tolerant genotypes. While progress has been made in breeding for tolerance to Al toxicity, little has been done on Mn and Fe toxicities. More research inputs are therefore required in: (1) developing screening methods for tolerance to manganese and iron toxicities; (2) elucidating the mechanisms of maize tolerance to Mn and Fe toxicities; and, (3) identifying the quantitative trait loci (QTL) responsible for Mn and Fe tolerance in maize cultivars. There is also a need to raise farmers' and other stakeholders' awareness of the problem of Al, Mn, and Fe soil toxicities to improve the adoption rate of the available acid-tolerant maize genotypes. Maize breeders should work more closely with farmers at the early stages of the release process of a new variety to facilitate its adoption level. Researchers are encouraged to strengthen their collaboration and exchange low soil pH-tolerant maize germplasm.

show abstract

Section: Iron Toxicitymentioning

confidence: 98%

Breeding Maize for Tolerance to Acidic Soils: A Review

et al. 2018

View full text Add to dashboard Cite

show abstract

“…S5). Both S and SO 4 2− can be reduced to S 2− under flooding conditions, and Fe 3+ can be reduced to Fe 2+ , and high concentration of Fe 2+ in the nonrhizosphere can increase mass flow of Fe 2+ to the rhizosphere ), leading to iron plaque formation on the root surface by the oxidation of Fe 2+ (Tripathi et al 2014). However, the formation of iron plaque is prevented when excessive S supply resulted in the formation of large amount of S 2− under flooding conditions and S 2− may react with Fe 2+ forming FeS which can precipitate on the root surface, limiting Fe 2+ oxidation on the root surface.…”

Section: Discussionmentioning

confidence: 99%

Impact of sulfur (S) fertilization in paddy soils on copper (Cu) accumulation in rice (Oryza sativa L.) plants under flooding conditions

et al. 2015

View full text Add to dashboard Cite

As the biogeochemical cycling of S in soil is closely associated with the mobility and bioavailability of heavy metals, in this study, we investigated the influence of S fertilization (S 0 and SO 4 2− ) in paddy soils on rice growth, iron plaque formation over root surface, and Cu speciation of rice rhizosphere soil under flooding conditions. The dry weight and height of rice plants increased significantly after S fertilization, indicating that S fertilization of Cu-contaminated paddy soils can enhance rice growth. Sulfur fertilization (less than 500 mg/kg) promoted the formation of iron plaque, thus sequestering a large amount of Cu on root surface and decreasing the bioavailability of Cu by inducing transformation of Cu bioavailable fractions (exchangeable, carbonate oxides, or iron and manganese oxide bound to Cu) to Cu bound to organic matter. Copper K-edge X-ray absorption near-edge structure (XANES) revealed that S fertilization increased the percentage of Cu present as Cu 2 S and Cu-cysteine in rice rhizosphere soil, thus reducing Cu mobility. As Cu concentration in rice plants decreased and the biomass of rice plants increased after S fertilization, it can be suggested that S fertilization may be an effective approach for managing Cucontaminated paddy soils.

show abstract

“…In the present study, GPX was more enhanced in tolerant rice, indicating a more prominent role in ROS detoxification in Triguna than IET-4786 ( Figure 6B). A significant portion of AsIII was changed to AsV in the rhizospheric region because of oxygen leakage during As stress to avoid anoxia [1,44]. Both AsV and AsIII were reported in various AsIIIexposed plant species [38].…”

Section: Discussionmentioning

confidence: 99%

Arsenite stress variably stimulates pro‐oxidant enzymes, anatomical deformities, photosynthetic pigment reduction, and antioxidants in arsenic‐tolerant and sensitive rice seedlings

Tripathi

Singh

Sharma

et al. 2015

Enviro Toxic and Chemistry

Self Cite

View full text Add to dashboard Cite

Contamination of arsenic (As) in rice (Oryza sativa L.) paddies and subsequent uptake by rice plants is a serious concern, because rice is a staple crop for millions of people. Identification of As toxicity and detoxification mechanisms in paddy rice cultivars would help to reduce As-associated risk. Arsenic tolerance and susceptibility mechanisms were investigated in 2 differential As-accumulating rice genotypes, Triguna and IET-4786, selected from initial screening of 52 rice cultivars as an As-tolerant and an As-sensitive cultivar, respectively, on the basis of root and shoot length during various arsenite (AsIII) exposures (0-50 μM). Indicators of oxidative stress, such as pro-oxidant enzymes (reduced nicotinamide adenine dinucleotide phosphate [NADPH] oxidase and ascorbate oxidase) and nitric oxide, were more numerous in the sensitive cultivar than in the tolerant cultivar. Arsenic-induced anatomical deformities were frequent in the sensitive cultivar, showing more distorted and flaccid root cells than the tolerant cultivar. Chlorophyll and carotenoid synthesis were inhibited in both cultivars, although the decline was more prominent in the sensitive cultivar at higher doses of As. Furthermore, the tolerant cultivar tolerated As stress by producing more antioxidants, such as proline, sustaining the ratio of ascorbate, dehydroascorbate, and glutathione peroxidase (GPX) activity as well as As detoxifying enzymes arsenate reductase, whereas these respective metabolic activities declined in sensitive cultivar, resulting in greater susceptibility to As toxicity.

show abstract

Roles for root iron plaque in sequestration and uptake of heavy metals and metalloids in aquatic and wetland plants

Cited by 182 publications

References 111 publications

Breeding Maize for Tolerance to Acidic Soils: A Review

Breeding Maize for Tolerance to Acidic Soils: A Review

Impact of sulfur (S) fertilization in paddy soils on copper (Cu) accumulation in rice (Oryza sativa L.) plants under flooding conditions

Arsenite stress variably stimulates pro‐oxidant enzymes, anatomical deformities, photosynthetic pigment reduction, and antioxidants in arsenic‐tolerant and sensitive rice seedlings

Contact Info

Product

Resources

About