Skip to main content
PMC home page
Plant Physiology logoLink to Plant Physiology
. 1977 Mar;59(3):376–380. doi: 10.1104/pp.59.3.376

Phloem Pressure Differences and 14C-Assimilate Translocation in Ecballium elaterium1,2

Shahla N Sheikholeslam a, Herbert B Currier a
PMCID: PMC542406  PMID: 16659855

Abstract

The role of phloem turgor pressure in 14C-assimilate translocation in Ecballium elaterium A. Rich was studied. The direction of translocation was manipulated by two methods: darkening, or defoliation, of the upper or lower halves of the shoots. After 24 hours of labeled assimilate movement, sieve tube turgor levels were measured with the phloem needle technique. Distribution of label, determined by autoradiography and counting, revealed a direct correlation between the direction of assimilate transport and the pressure difference. Phloem turgor levels always decreased in the stem of darkened shoots; this resulted in greater pressure differences in the stem between the source leaf receiving 14CO2 and treated regions.

Full text

PDF
376

Images in this article

379Image
on p.379

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Esau K., Cronshaw J., Hoefert L. L. Relation of beet yellows virus to the phloem and to movement in the sieve tube. J Cell Biol. 1967 Jan;32(1):71–87. doi: 10.1083/jcb.32.1.71. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Geiger D. R., Batey J. W. Translocation of C Sucrose in Sugar Beet during Darkness. Plant Physiol. 1967 Dec;42(12):1743–1749. doi: 10.1104/pp.42.12.1743. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Hammel H. T. Measurement of turgor pressure and its gradient in the Phloem of oak. Plant Physiol. 1968 Jul;43(7):1042–1048. doi: 10.1104/pp.43.7.1042. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Hartt C. E., Kortschak H. P. Sugar Gradients and Translocation of Sucrose in Detached Blades of Sugarcane. Plant Physiol. 1964 May;39(3):460–474. doi: 10.1104/pp.39.3.460. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Quinlan J. D., Weaver R. J. Influence of Benzyladenine, Leaf Darkening, and Ringing on Movement of C-labeled Assimilates Into Expanded Leaves of Vitis vinifera L. Plant Physiol. 1969 Sep;44(9):1247–1252. doi: 10.1104/pp.44.9.1247. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Ziegler H. Morphactins. Endeavour. 1970 Sep;29(108):112–116. [PubMed] [Google Scholar]

Articles from Plant Physiology are provided here courtesy of Oxford University Press

RESOURCES