Lead toxicity effects on indole-3-ylacetic acid-induced cell elongation

Lane, S.D.; Eisenacher, Martin; Garrod, J. F.

doi:10.1007/bf00385010

Cited by 62 publications

(21 citation statements)

References 19 publications

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“…The data do not lend themselves to regression analysis, but indicate that the zinc-induced reduction in growth rate was principally due to an inhibition of cell elongation, particularly at lower concentrations, and not of cell division, as Horst, Wagner & Marschner (1983) report for the cowpea {Vigna unguiculata) with respect to aluminium toxicity. The present conclusion is supported by studies of lead toxicity to Triticum aestivum (Lane, Martin & Garrod, 1978). Dry mass accumulation was less severely affected by exogenous zinc.…”

Section: Discussionsupporting

confidence: 81%

ZINC TOLERANCE IN BETULA SPP.

Denny

Wilkins

1987

New Phytologist

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SUMMARYClones of Betula pendula Roth, and B. pubescens Ehrh., collected as seed from zinc-contaminated mine tailings, were grown aseptically in a liquid/perlite medium. Three zinc-tolerant and four non-tolerant genotypes were compared with respect to extension growth and zinc uptake over a range of external concentrations of zinc. The effect of increasing zinc concentration on total root length and root cell length was also examined. Extension growth declined rectilinearly as the external zinc concentration increased, but the relationship between uptake and external concentration was not rectilinear. After an initial proportional increase, concentrations of zinc in tissues remained constant over much of the range of external concentrations at which some growth was possible. Fresh weight concentrations of zinc in tolerant and non-tolerant genotypes were similar at similar external concentrations. However, at a characteristic threshold external concentration, control of uptake broke down and plants were inundated with zinc. The decrease in extension growth was found to be due mainly to a progressive inhibition of cell elongation. Zinc tolerance in Betula lies in an ability to maintain proportionally more extension growth at similar internal and external zinc concentrations. Neither a tolerance mechanism involving internal detoxification, nor binding of zinc ions to electronegative sites in the cell walls, are consistent with the results. However, these findings are compatible with a tolerance mechanism involving control of uptake operating at the endodermis.

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Section: Discussionsupporting

confidence: 81%

ZINC TOLERANCE IN BETULA SPP.

Denny

Wilkins

1987

New Phytologist

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“…Root growth due to cell division is minimal in comparison with growth due to the enormous elongation potential of cells. The latter is strongly inhibited even by very low lead doses, which may be caused by the changes in cell wall characteristics (LANE et al 1978). This conforms well with the observation of C-tumors and hooks in certain concetrations.…”

Section: Lead Influence On Root Growthsupporting

confidence: 90%

Mitotic Disturbances Induced by Low Doses of Inorganic Lead

Wierzbicka

1988

Caryologia

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SUMMARY -Adventitious roots of Allium cepa L. have been treated with the sublethal dose of 2.5 mg dm-3 Pb 2 + as well as the partly lethal one -3.0 mg dm-3 Pb 2 + derived from two lead compounds: PbCh and Pb(N03h. These compounds induced numerous C-mitoses. This effect coincided with a strong inhibition of the root growth and lowering of the mitotic activity. However, lead effect in this range does not constitute a genetic threat in natural environment, since lead doses with such strong effects do not normally occur in the environment. However the lower lead dose, 1.0 dm-3 Pb 2 + from PbCh and Pb(N03h resulted in slight but statistically significant clastogenic effects, without disturbing the mitotic activity. It has further been found that lead chloride (the component of car exhaust gas) administered in the low dose (1 mg dm-') was more clastogenic than lead nitrate. The presented results point to a potentially mutagenic effect of low lead doses.

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“…In Raphanus sativus root elongation is inhibited, roots are caused to form adventitiously on the stems, stem elongation and leaf expansion are inhibited (LANE and MARTIN 1980). The inhibiting effects of Pb on growth may arise from interference of Pb with auxin-regulated cell elongation which can be demonstrated in the Avena coleoptile assay (LANE et al 1978). It has been claimed that a primary cause of inhibition of cell growth arises from a Pb-induced stimulation of IAA oxidation (MuKHERJI and MAITRA 1977).…”

Section: Lead Toxicitymentioning

confidence: 97%