Planta

, Volume 100, Issue 3, pp 200–207

Phloem transport of 14C-labelled assimilates in Ricinus

  • Shelagh M. Hall
  • D. A. Baker
  • J. A. Milburn
Article

DOI: 10.1007/BF00387036

Cite this article as:
Hall, S.M., Baker, D.A. & Milburn, J.A. Planta (1971) 100: 200. doi:10.1007/BF00387036

Summary

Exudate can be obtained from incisions made in the bark of the stem of actively growing Ricinus plants. 14C-labelled assimilates from a fed leaf are rapidly detected in the exudate. This movement was both acropetal and basipetal from the fed leaf, at rates of over 100 cm h-1. Estimated rates within intact plants were 80–84 cm h-1.

In contrast with xylem sap obtained from the same plant, the exudate obtained had an alkaline pH (8.2), a high dry matter content (10–12.5%), high sugar content (8–10%) which was predominantly sucrose; high potassium content (60–80 mM) and low calcium content (0.5–1.0 mM).

It is concluded, on the basis of the present evidence, that the exudate is a true sample of the sieve tube sap undergoing translocation.

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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • Shelagh M. Hall
    • 1
  • D. A. Baker
    • 1
  • J. A. Milburn
    • 2
  1. 1.School of Biological SciencesUniversity of SussexBrightonUK
  2. 2.Department of BotanyThe UniversityGlasgow

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