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Updated: Jan 29, 2026

Author Spotlight: Optimized Transformation Protocol for Chlorella vulgaris Using Agrobacterium tumefaciens
Published on: October 27, 2023
Rhizogenesis in Forsythia×intermedia and Syringa vulgaris; application of a simple internode experimental system
1Crop Science Department, Horticulture Research International, East Malling, West Malling, Kent ME19 6BJ, UK e-mail: tim.marks@hri.ac.uk Fax: +44-1732-849067, , , , , , GB.
Abstract:
Differences in rhizogenesis between easy-to-root Forsythia×intermedia Zab. cv. Lynwood and difficult-to-root Syringa vulgaris L. cv. Madame Lemoine were measured in an experimental system based upon internodal stem sections excised from axillary shoot cultures. Root induction in Syringa was distinctly polar, responding best to distal application of indole-3-butyric acid (IBA), whereas Forsythia was equally responsive to IBA applied at either end. Root initiation in Syringa declined rapidly from 73% to 32% over 48 h when the application of a 24-h pulse of IBA was delayed following excision of the internode; in Forsythia a smaller decline (93-70%) occurred over 144 h. Forsythia internodes were the more responsive, and developed roots after distal or proximal application of 3 μM IBA, whereas Syringa required the distal application of 30 μM IBA.
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