Uptake and translocation of fluoride in Helianthus annuus L. grown in sand culture

J. A. Cooke, M. S. Johnson, A. W. Davison

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In Helianthus annuus seedlings grown in sand culture for 5 wk, the concentration of fluoride in the root and shoot was generally proportional to the concentration in the substrate. Highest concentrations were present in the roots and the concentrations in the leaves decreased acropetally. In a more detailed 6 wk study, the dynamics of uptake and translocation differed markedly. Whereas the total fluoride in the plant increased steadily in proportion to increased root dry weight, the amount translocated to the shoot each wk was reduced to almost zero after 4 wk. The fluoride in the shoot accumulated initially in the most physiologically active leaves. It appears, therefore, that the acropetal pattern of leaf accumulation is a function of leaf age rather than of position on the stem. The dynamics of accumulation in leaves suggested that a portion of the fluoride in a senescing leaf was retranslocated to younger leaves. Thus, although there was an increase in the immobility of the fluoride in the root over the study period, a portion of the fluoride in the shoot could be translocated from older to younger leaves.

Original languageEnglish
Pages (from-to)76-88
Number of pages13
JournalFluoride - Quarterly Reports
Volume11
Issue number2
Publication statusPublished - Jan 1 1978

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Helianthus
fluorides
Fluorides
Helianthus annuus
Sand
sand
uptake mechanisms
leaves
shoots
Seedlings
Weights and Measures
Substrates
stems
seedlings

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Chemistry(all)
  • Dentistry(all)
  • Toxicology
  • Agricultural and Biological Sciences(all)
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

Cite this

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abstract = "In Helianthus annuus seedlings grown in sand culture for 5 wk, the concentration of fluoride in the root and shoot was generally proportional to the concentration in the substrate. Highest concentrations were present in the roots and the concentrations in the leaves decreased acropetally. In a more detailed 6 wk study, the dynamics of uptake and translocation differed markedly. Whereas the total fluoride in the plant increased steadily in proportion to increased root dry weight, the amount translocated to the shoot each wk was reduced to almost zero after 4 wk. The fluoride in the shoot accumulated initially in the most physiologically active leaves. It appears, therefore, that the acropetal pattern of leaf accumulation is a function of leaf age rather than of position on the stem. The dynamics of accumulation in leaves suggested that a portion of the fluoride in a senescing leaf was retranslocated to younger leaves. Thus, although there was an increase in the immobility of the fluoride in the root over the study period, a portion of the fluoride in the shoot could be translocated from older to younger leaves.",
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Uptake and translocation of fluoride in Helianthus annuus L. grown in sand culture. / Cooke, J. A.; Johnson, M. S.; Davison, A. W.

In: Fluoride - Quarterly Reports, Vol. 11, No. 2, 01.01.1978, p. 76-88.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Johnson, M. S.

AU - Davison, A. W.

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N2 - In Helianthus annuus seedlings grown in sand culture for 5 wk, the concentration of fluoride in the root and shoot was generally proportional to the concentration in the substrate. Highest concentrations were present in the roots and the concentrations in the leaves decreased acropetally. In a more detailed 6 wk study, the dynamics of uptake and translocation differed markedly. Whereas the total fluoride in the plant increased steadily in proportion to increased root dry weight, the amount translocated to the shoot each wk was reduced to almost zero after 4 wk. The fluoride in the shoot accumulated initially in the most physiologically active leaves. It appears, therefore, that the acropetal pattern of leaf accumulation is a function of leaf age rather than of position on the stem. The dynamics of accumulation in leaves suggested that a portion of the fluoride in a senescing leaf was retranslocated to younger leaves. Thus, although there was an increase in the immobility of the fluoride in the root over the study period, a portion of the fluoride in the shoot could be translocated from older to younger leaves.

AB - In Helianthus annuus seedlings grown in sand culture for 5 wk, the concentration of fluoride in the root and shoot was generally proportional to the concentration in the substrate. Highest concentrations were present in the roots and the concentrations in the leaves decreased acropetally. In a more detailed 6 wk study, the dynamics of uptake and translocation differed markedly. Whereas the total fluoride in the plant increased steadily in proportion to increased root dry weight, the amount translocated to the shoot each wk was reduced to almost zero after 4 wk. The fluoride in the shoot accumulated initially in the most physiologically active leaves. It appears, therefore, that the acropetal pattern of leaf accumulation is a function of leaf age rather than of position on the stem. The dynamics of accumulation in leaves suggested that a portion of the fluoride in a senescing leaf was retranslocated to younger leaves. Thus, although there was an increase in the immobility of the fluoride in the root over the study period, a portion of the fluoride in the shoot could be translocated from older to younger leaves.

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