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| Titel: |
Foliar absorption of nickel: Determination of its cuticular behavior using isolated cuticles |
| Auteur: |
Chamel, Andre Neumann, Peter |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 10 (1987) nr. 1 pagina's 99-111 |
| Jaar: |
1987-01 |
| Inhoud: |
The sorption and penetration of 63Ni at the cuticular level were investigated using enzymatically isolated tomato fruit cuticles. The high values of the partition coefficients determined by immersing cuticular material in a nickel chloride solution indicated that Ni was well retained by cuticular constituents. They were assayed by both direct and indirect methods and increased more than twofold between 1 and 6 days revealing that equilibration between the cuticular material and the bathing solution proceeds very slowly. Ni concentrations at 6 days were about 1,000 times higher in cuticles than in the immersion solution. No significant difference appeared between the immersion with buffer (pH : 8) and without buffer (pH: 6.5). Only 3.2% of sorbed 63Ni was removed by successive rinses in water. The remainder of the radioactivity appeared to be ionically bound to negatively charged exchange sites on the cuticle since 99% of bound 63Ni could be exchanged by rinsing with IN HC1. The cuticular permeability coefficient (P) and the diffusion coefficient (D) determined under self-diffusion conditions at pH 8, were 1.6 x 10-8 cm.8-l and 37.4 x 10-12 cm2.s-1 respectively. High variability was noted between cuticles isolated from the same fruit sample. By comparison the permeability coefficient of 45Ca at pH 8 was 16 times higher than for Ni. The agronomical and ecotoxicological implications of these results are considered. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 9 gevonden artikelen
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