Protoplasma

, Volume 8, Issue 1, pp 313–343 | Cite as

Hydrogen-ion phenomena in plants

II. An investigation of the buffer complex of sap from stems ofPelargonium sp.
  • J. I. Armstrong
Abhandlungen

Summary

  1. 1.

    The expressed sap from young and mature stems and leaves has a low initial pH, in the region of pH 4·0.

     
  2. 2.

    The types of buffering of the expressed sap from young and mature stems and from leaves are compared.

     
  3. 3.

    The buffering of sap expressed from young aerial stems is considered in detail and is found to be extremely high for a nonsucculent type.

     
  4. 4.

    Phosphates and the characteristic odoriferous acid of the tissues, pelargonic acid, are shown to be unimportant constituents of the buffer complex.

     
  5. 5.

    Organic acids constitute the major part of the buffer complex at the initial pH of the sap. The acids found and estimated include oxalic acid 0·0573 M., malic acid 0·0337 M., citric acid 0·0066 M. and tartaric acid 0·003 M.; and the contributions made by all these buffer systems to the buffering exhibited by expressed sap are considered in detail.

     
  6. 6.

    Evidence to support the suggestion that the buffer complexes of sap from young and mature stems and from leaves are identical is brought forward.

     

Keywords

Phosphate Citric Acid Organic Acid Major Part Oxalic Acid 
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.
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Bibliography

  1. Armstrong, J. I. 1929. This Series I. Hydrion Concentration and Buffers in the Fungi. Protoplasma, Bd. VIII, p. 222.Google Scholar
  2. Czapek, F. 1925. Biochemie der Pflanzen. Vol. III, p. 98.Google Scholar
  3. Hempel, J. 1917. Buffer processes in the metabolism of succulent plants. C. R. du lab. Carlsberg XIII, p. 1.Google Scholar
  4. Ingold, C. T. 1929. The Hydrion Concentration of Plant Tissues. XI. Buffers of the potato tuber. Protoplasma, Vol. VI, 1, p. 51.Google Scholar
  5. Martin, S. H. 1927. “Same Series” IV. The buffer of sunflower hypocotyl. Protoplasma, Vol. I, 4, p. 522.Google Scholar
  6. — 1928. “Same Series” VII. The buffers of sunflower stem and root. Protoplasma, Vol. III, 3, p. 274.Google Scholar
  7. — 1928. “Same Series” VIII. The buffers of bean stem and root. Protoplasma, Vol. III, 3, p. 282.Google Scholar
  8. Pringsheim, H. 1910. Nachweis und Bestimmung der biologisch wichtigen Säuren. Handbuch der biologischen Arbeitsmethoden II, p. 20.Google Scholar
  9. Small, J. 1929. Hydrogen-ion Concentration in Plant Cells and Tissues. Protoplasma-Monographien, Bd. II. Borntraeger, Berlin.Google Scholar

Copyright information

© Verlag von Gebrüder Borntraeger 1930

Authors and Affiliations

  • J. I. Armstrong
    • 1
  1. 1.Department of BotaniQueen's UniversityBelfast

Personalised recommendations