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. 1968 Mar;82(1):22-32.
doi: 10.1007/BF00384695.

Evidence for gibberellin-like substances in phloem exudate of higher plants

G V Hoad  1 , M R Bowen
Affiliations

Evidence for gibberellin-like substances in phloem exudate of higher plants

G V Hoad et al. Planta. 1968 Mar.

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.

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