✦ LIBER ✦

Phloem transport of14C-labelled assimilates inRicinus

✍ Scribed by Shelagh M. Hall; D. A. Baker; J. A. Milburn

Book ID: 104750501
Publisher: Springer-Verlag
Year: 1971
Tongue: English
Weight: 394 KB
Volume: 100
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00387036

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✦ Synopsis

Exudate can be obtained from incisions made in the bark of the stem of actively growing Ricinus plants, ltC-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 raM) and low calcium content (0.5-1.0 ml~I).

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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