ZINC TOLERANCE IN <i>BETULA</i> SPP.

Denny, Hilary J.; Wilkins, D. A.

doi:10.1111/j.1469-8137.1987.tb00157.x

Cited by 4 publications

(7 citation statements)

References 23 publications

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“…Sela et al (1988) reported localization of Cu (also Cd and U) in the aquatic fern Azolla filiculoides and van Steveninck et al (1990a,b, van Steveninck, van Stevenick & Fernando 1992) have investigated Zn (and Cd) localization in the aquatic angiosperm Lemna minor . Other reports have investigated grasses (Mullins et al 1985; van Steveninck et al 1987) and dicotyledonous plants (Mullins et al 1985; van Steveninck et al 1993, 1994), including a hyper‐accumulating herb (Vázquez et al 1992) and tree seedlings (Denny & Wilkins 1987; Jentschke, Fritz & Godbold 1991; Arduini, Godbold & Onnis 1996).…”

Section: Discussionmentioning

confidence: 99%

“…Our results showed centripetal increase in Zn with the highest levels in the stele. Previous studies have emphasized Zn localization in parenchyma adjacent to vascular tissue in L. minor (van Steveninck et al 1990a), in cortical parenchyma in Deschampsia caespitosa (van Steveninck et al 1987), and the endodermis (Denny & Wilkins 1987; van Steveninck et al 1993, 1994). Mullins et al (1985) found that Zn accumulation bodies decreased centripetally in D. caespitosa and Anthoxanthum odoratum .…”

Section: Discussionmentioning

confidence: 99%

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Metal localization in water hyacinth roots from an urban wetland

Vesk¹,

Nockolds

Allaway³

1999

Plant Cell & Environment

112

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Metal localization within and around roots of water hyacinth (Eichhornia crassipes) growing in a wetland receiving urban run-off was studied by energy dispersive X-ray microanalysis of sections from freeze-substituted roots. Sampling randomly from an order of magnitude gradient in metal concentrations (Cu and Pb) allowed us the opportunity to identify general patterns of metal localization. Iron was present at high levels at the root surface, and this may have been a root plaque as described for wetland plants with roots anchored in flooded soils. Iron levels decreased centripetally across the root and were higher in cell walls than within cells. Trace metals (Cu, Zn and Pb) were not localized at the root surface. In contrast with iron, trace metal levels increased centripetally across the root, tended to be higher inside cells and were highest within cells in the stele. Variability of localization was high for all metals analysed. Multivariate statistical analyses (principal components analysis and multidimensional scaling) were useful for identifying overall patterns in elemental distribution. Key-words:Eichhornia crassipes (Mart.) Solms; accumulation; copper; iron; lead; multivariate analysis; root plaque; uptake; X-ray microanalysis; zinc.Abbreviations: PCA, principal components analysis; MDS, multidimensional scaling; STEM, scanning transmission electron microscopy. INTRODUCTIONAquatic plants are known to accumulate metals from their environment (Outridge & Noller 1991) and affect metal fluxes through those ecosystems (Jackson, Rasmussen & Kalff 1994;St-Cyr, Campbell & Guertin 1994). These effects have led scientists, engineers and managers to be interested in metal toxicity and tolerance (van Steveninck et al. 1990a;Ernst, Verkleij & Schat 1992), and the roles of aquatic plants in biogeochemical metal fluxes (Jackson et al. 1994;St-Cyr et al. 1994), as biological filters for polluted waters (Brix & Schierup 1989;Ellis et al. 1994); and as biomonitors of environmental metal levels (Whitton & Kelly 1995;Markert 1995).Metal accumulation is of interest for basic research into the physiology and ecology of plant survival in flooded conditions and under elevated metal levels (Otte et al. 1989). Root plaques, predominantly of Fe, are commonly found on wetland plants with anchored roots and conflicting results have been reported as to their effects on metal uptake, immobilization and tolerance (Otte et al. 1989; StCyr & Campbell 1996;Ye et al. 1997). X-ray microanalysis has been suggested as a way to investigate these questions further (Ye et al. 1997).Despite much work, there are no clear guidelines for biomonitoring of metals using aquatic plants (Langston & Spence 1994;Phillips 1994;Markert 1995). The surface layer of roots may be enriched in metals but not be bioavailable; further it may affect uptake of metals (Markert 1995;St-Cyr & Campbell 1996). There are many instances where wetlands-utilizing aquatic plants are employed for removal of pollutants, including metals, from waters (see Brix & Schierup...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Metal localization in water hyacinth roots from an urban wetland

Vesk¹,

Nockolds

Allaway³

1999

Plant Cell & Environment

112

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“…A Zn-sensitive clone had no such ability. Zinc-tolerant genotypes of Betula resisted zinc toxicity by controlling uptake of the metal into their tissues at higher external concentrations (Denny and Wilkins 1987). Zinc-tolerant genotypes of Betula resisted zinc toxicity by controlling uptake of the metal into their tissues at higher external concentrations (Denny and Wilkins 1987).…”

Section: B Toxicitymentioning

confidence: 99%

Zinc Nutrition in Horticultural Crops

Swielik

1998

Horticultural Reviews

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“…Macrophytes have been used during the last two decades for metal removal (Denny and Wilkins 1987). One such macrophyte Ipomoea aquatica is a semi-aquatic tropical plant grown as a leaf vegetable.…”

Section: Introductionmentioning

confidence: 99%

Assessment of arbuscular mycorrhizal fungi on the phytoremediation potential of Ipomoea aquatica on cadmium uptake

Bhaduri

Fulekar

2012

3 Biotech

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The phytoremedial potential of Ipomoea aquatica and role of arbuscular mycorrhizal fungi (AMF) during Cadmium uptake was studied under two different soils i.e., soil inoculated with and without AMF. The plants were treated with different concentrations of Cd(NO)3 starting from 0, 5, 10, 25, 50, and 100 ppm in three replicate design in soil with and without AMF inoculation. Results showed that AMF enhanced accumulation of cadmium in plant tissues at all concentrations. Plants in AMF exhibited tolerance for Cd up to 100 mg/l and accumulated 88.07% in its tissues with no visual symptoms of toxicity, whereas those in non-AMF showed marked growth reduction at the same concentration with a metal accumulation of 73.2%. A significant variation of antioxidant enzymes under different environments evaluated the defense pathways of plants during uptake of Cd. Physiological changes and nutrient uptake showed that plants inoculated in AMF were more unwavering during stress conditions. The study established that phytoremedial potential of I. aquatica depends on rhizospheric conditions which enhanced Cd uptake. Finally, it was established that AMF was able to maintain an efficient symbiosis with I. aquatica in soil moderately contaminated by Cd, viable due to relation between fungus and plant.

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ZINC TOLERANCE IN BETULA SPP.

Cited by 4 publications

References 23 publications

Metal localization in water hyacinth roots from an urban wetland

Metal localization in water hyacinth roots from an urban wetland

Zinc Nutrition in Horticultural Crops

Assessment of arbuscular mycorrhizal fungi on the phytoremediation potential of Ipomoea aquatica on cadmium uptake

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