The role of the cell wall in the mechanism of lead and zinc tolerance in Anthoxanthum odoratum L

Poulter, A. G.; Collin, H. A.; Thurman, David A.; Hardwick, K.

doi:10.1016/0168-9452(85)90029-9

Cited by 37 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, a wall-binding mechanism would not seem to be operating in Betula. This view is supported by conclusions of Poulter et al (1985), who examined zinc tolerance in protoplasts of Anthoxanthum odoratum.…”

Section: Discussionsupporting

confidence: 57%

ZINC TOLERANCE IN BETULA SPP.

Denny

Wilkins

1987

New Phytologist

View full text Add to dashboard Cite

SUMMARYClones of zinc-tolerant and non-tolerant genotypes of Betula pendula Roth, and B. pubeseens Ehrh. were cultured aseptically on media containing different concentrations of zinc. The location, concentration and form of zinc in root tissues of both groups of genotype were compared using various microanalytical techniques. At concentrations of zinc at which all genotypes were viable, there were no obvious differences between the tolerant and non-tolerant genotypes. When the roots were subjected to concentrations above the lethal threshold, zinc accumulated intracellularly, at the endodermis, in the form of electron-dense granules. This formof accumulation was symptomatic of tissue inundation with zinc. The results do not support the presence of cell wall binding or intracellular detoxification mechanisms of tolerance. The possibility that zinc tolerance, control of zinc uptake and zinc-induced inhibition of cell extension are all linked by common events centred on the plasma membrane are discussed.

show abstract

Section: Discussionsupporting

confidence: 57%

ZINC TOLERANCE IN BETULA SPP.

Denny

Wilkins

1987

New Phytologist

View full text Add to dashboard Cite

show abstract

“…The cell wall is the first barrier when heavy metals enter into plants (Poulter et al, 1985). The immobilization of metal ions by the cell wall is one of the defense strategies against heavy metal toxicity (Vázquez et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Subcellular and Molecular Distribution of Cadmium in Two Rice Genotypes With Different Levels of Cadmium Accumulation

Zuo-xiang

Zhu³

et al. 2012

Journal of Plant Nutrition

View full text Add to dashboard Cite

The chemical form and subcellular and molecular distribution of cadmium (Cd) in the roots and leaves was investigated in two rice genotypes: the low Cd-accumulating "GuangyuanzhanNo. 3', and the high Cd-accumulating "Zhenguiai." Elevated Cd level in the medium caused a significant increase in Cd concentration in all parts of the roots and leaves. The soluble fractions in leaves and roots of 'Zhenguiai' contained a higher proportion of the Cd than those in 'Guangyuanzhan No. 3'. Furthermore, 'Zhenguiai' had a higher proportion of de-ionized water and 80% ethanol-extractable Cd, which is the most mobile Cd among its various chemical forms. Following gel filtration of the soluble fraction of leaf and root extracts of both genotypes, a compound with a molecular weight of ∼3 kDa, probably comprising phytochelatins (PCs), was the major Cdbinding component. The Cd concentrations in the fractions from the roots of 'Zhenguiai' were noticeably higher than those of 'Guangyuanzhan No. 3', which possibly resulted in the latter cultivar having a lower Cd mobility in the roots and less Cd translocation from the roots to the aboveground parts.

show abstract

“…Cation binding to plant cell walls has been implicated as a crucial step in a wide range of physiological processes including cell elongation (13), heavy metal tolerance (15), and ion uptake (9). The cation composition of the higher plant cell wall cannot be easily measured, and therefore attempts have been made to model its cation composition as a function of the cation composition of the surrounding solution.…”

mentioning

confidence: 99%

Mass-Action Expressions of Ion Exchange Applied to Ca²⁺, H⁺, K⁺, and Mg²⁺ Sorption on Isolated Cells Walls of Leaves from Brassica oleracea

Bush¹,

McColl²

1987

Plant Physiol.

View full text Add to dashboard Cite

The cation exchange properties of cell walls isolated from collard (Bassia okracea var acephala D.C.) leaves were investipted. Cation sorption on cell walls was described by mass-action expressions of ion exchange, rather than by the traditional Donnan equilibrium. The massaction expressions enable the selectivity of the wail for one cation over another to be determined unambiguously from ion exchange isotherms. We found that: (a) the cation composition of the wall varied as a function of the solution cation concentration, solution cation composition, and pH in a way predicted by mass action; (b) the affinity of the wall for divalent cations increased as the equivalent fraction of divalent cation on the wall increased, and as the concentration of divalent cations in solution increased; (c) the selectivity of the wall for any metal cation pair was not altered by the concentration of HZ in solution or on the wall; (d) H' sorption on the wail may be treated as a cation exchange reaction making it possible to calculate the relative affinity of the wall for metal cation pairs from HI-metal (Me) titration curves; and (e) the relative affinity of the wall for the cations we studied was: HI >> (K -Ca2+) > Mg2+. A cation-exchange model including surface complexes is consistent with observed cation selectivity. We conclude that metal cations interact with the wall to minimiz or eliminate long-range electrostatic interactions and suggest that this may be due to the formation of site-specific cationwall surface complexes.Cation binding to plant cell walls has been implicated as a crucial step in a wide range of physiological processes including cell elongation (13), heavy metal tolerance (15), and ion uptake (9). The cation composition of the higher plant cell wall cannot be easily measured, and therefore attempts have been made to model its cation composition as a function of the cation composition of the surrounding solution. The traditional approach to developing these models treats the wall as a Donnan system (3-7, 9, 16). A serious drawback to this approach, however, is that the resultant equations involve ionic molalities that cannot be directly measured. In this paper we use the mass-action description ofion exchange to describe cation binding to isolated cell walls ofcollard leaves and thereby avoid ambiguities inherent in previous approaches.The total cation mass ofthe cell wall is divisible into two parts: '

show abstract

The role of the cell wall in the mechanism of lead and zinc tolerance in Anthoxanthum odoratum L

Cited by 37 publications

References 9 publications

ZINC TOLERANCE IN BETULA SPP.

ZINC TOLERANCE IN BETULA SPP.

Subcellular and Molecular Distribution of Cadmium in Two Rice Genotypes With Different Levels of Cadmium Accumulation

Mass-Action Expressions of Ion Exchange Applied to Ca²⁺, H⁺, K⁺, and Mg²⁺ Sorption on Isolated Cells Walls of Leaves from Brassica oleracea

Contact Info

Product

Resources

About

The role of the cell wall in the mechanism of lead and zinc tolerance in Anthoxanthum odoratum L

Cited by 37 publications

References 9 publications

ZINC TOLERANCE IN BETULA SPP.

ZINC TOLERANCE IN BETULA SPP.

Subcellular and Molecular Distribution of Cadmium in Two Rice Genotypes With Different Levels of Cadmium Accumulation

Mass-Action Expressions of Ion Exchange Applied to Ca2+, H+, K+, and Mg2+ Sorption on Isolated Cells Walls of Leaves from Brassica oleracea

Contact Info

Product

Resources

About

Mass-Action Expressions of Ion Exchange Applied to Ca²⁺, H⁺, K⁺, and Mg²⁺ Sorption on Isolated Cells Walls of Leaves from Brassica oleracea