Related Experiment Video
Updated: May 3, 2026

Collection and Analysis of Arabidopsis Phloem Exudates Using the EDTA-facilitated Method
Published on: October 23, 2013
Evidence for gibberellin-like substances in phloem exudate of higher plants
Abstract:
Samples of sieve-tube sap were obtained as honeydew from aphids feeding on three species of higher plants. The honeydew was extracted, chromatographed and tested in several bioassays for the presence of gibberellin-like substances. The bioassay results indicated that gibberellin-like substances were translocated in the phloem of dandelion (Taraxacum officinale), broad bean (Vicia faba) and willow (Salix viminalis). Results obtained with willow showed that the concentration of gibberellin-like substances in the sieve-tube sap is daylength dependent, high levels being present in plants maintained under long days and low levels in short day plants.
Related Concept Videos
Phloem and Sugar Transport
Short-distance Transport of Resources
The Apoplast and Symplast
Plant Hormones
Cell Signaling in Plants
Responses to Gravity and Touch

