Advertisement

Plant and Soil

, Volume 29, Issue 3, pp 449–459 | Cite as

Studies of silica in the oat plant

IV. Silica content of plant parts in relation to stage of growth, supply of silica, and transpiration
  • K. A. Handreck
  • L. H. P. Jones
Article

Summary

Oat plants,Avena sterilis L., were grown on soils in which the concentration of monosilicic acid in the soil solution, that is the level of supply of silica, ranged from 7 to 67 ppm SiO2. Analyses at intervals throughout the growing period showed that the level of supply affected the amount and concentration of silica in the plant but not the pattern of its distribution among the parts.

At maturity the caryopsis contained only 0.5 to 0.8 per cent of the total silica in the tops while the other parts of the inflorescence contained 40.7 to 41.3 per cent. The leaves (blade and sheath) contained 42.5 to 45.0 per cent of the total silica and the stems contained 7.8 to 10.9 per cent; the remainder was present in small sterile tillers.

The concentration of silica in the dry matter was highest in the palea, lemma glumes, awn, and leaves. Among the leaves, the flag leaf had the highest silica content, both in terms of concentration in the dry matter and amount per leaf. The distribution of silica along a leaf followed a hyperbolic curve, the concentration being highest at the apex and lowest at the base of the blade.

The chemistry of silica and the pattern of its distribution in the tops suggest that monosilicic acid and water move concomitantly in the transpiration stream and that solid silica is deposited in greatest quantities in those parts and regions from which water is lost in greatest quantities.

Keywords

SiO2 Plant Physiology Soil Solution Water Move Silica Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Bonnet, O. T.,In: Oats and Oat Improvement (edited by F. A. Coffman), pp. 41–62. American Society of Agronomy, Madison (1961).Google Scholar
  2. 2.
    Coppent, M., Ducet, G., Guerillot, J., and Kahane, E., Sur la silice de la paille et du grain de ble. Ann. Agron. N. S.17, 564–567 (1947).Google Scholar
  3. 3.
    Esau, K., Plant Anatomy, 2nd. Ed. p. 432. John Wiley and Sons, Inc., New York (1965).Google Scholar
  4. 4.
    Gaff, D. F., Chambers, T. C., and Markus, K., Studies of extrafascicular movement of water in the leaf. Australian. J. Biol. Sci.17, 581–586 (1964).Google Scholar
  5. 5.
    Grundbacher, F. J., The physiological function of the cereal awn. Bot. Rev.29, 366–381 (1963).Google Scholar
  6. 6.
    Handreck, K. A., and Jones, L. H. P., Uptake of monosilicic acid byTrifolium incarnatum L. Australian J. Biol. Sci.20, 483–485 (1967).Google Scholar
  7. 7.
    Jones, L. H. P., and Handreck, K. A., Studies of silica in the oat plant. III. Uptake of silica from soils by the plant. Plant and Soil23, 79–96 (1965).Google Scholar
  8. 8.
    Jones, L. H. P., and Milne, A. A., Studies of silica in the oat plant. I. Chemical and physical properties of the silica. Plant and Soil18, 207–220 (1963).Google Scholar
  9. 9.
    Jones, L. H. P., Milne, A. A., and Sanders, J. V., Tabashir: an opal of plant origin. Science151, 464–466 (1966).Google Scholar
  10. 10.
    Jones, L. H. P., Milne, A. A., and Wadham, S. M., Studies of silica in the oat plant. II. Distribution of silica in the plant. Plant and Soil18, 358–371 (1963).Google Scholar
  11. 11.
    Okawa, K., The physiological action of silica for plants. J. Sci. Soil Manure (Japan)10, 95–110 (1936).Google Scholar
  12. 12.
    Parry, D. W., and Smithson, F., Types of opaline silica deposition in the leaves of British grasses. Ann. Bot. (London)28, 169–185 (1964).Google Scholar
  13. 13.
    Russell, E. W., Soil Conditions and Plant Growth, 9th. Ed. p. 536. Longmans Green and Co., London (1961).Google Scholar
  14. 14.
    Thorne, G. N., Varietal differences in photosynthesis of ears and leaves of barley. Ann. Bot. (London)27, 155–174 (1963).Google Scholar
  15. 15.
    Weatherly, P. D.,In: The Water Relations of Plants (edited by A. J. Rutter and F. H. Whitehead), pp. 85–100. Blackwell, London (1963).Google Scholar
  16. 16.
    Yoshida, S., Ohnishi, Y., and Kitagishi, K., Histochemistry of silicon in rice plant. 2. Localization of silicon within rice tissues. Soil Sci. Plant Nutr.8, 36–41 (1962).Google Scholar

Copyright information

© Martinus Nijhoff 1968

Authors and Affiliations

  • K. A. Handreck
    • 1
  • L. H. P. Jones
    • 1
  1. 1.C.S.I.R.O., Division of Plant Industry, c/o School of AgricultureUniversity of MelbourneVictoriaAustralia

Personalised recommendations