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Annals of Botany 37: 987-992, 1973
© 1973 Annals of Botany Company

RESEARCH-ARTICLE

The Galls on Forsythia intermedia Zab.

R. C. SHATTOCK1

Imperial College Field Station Silwood Park, Ascot, Berkshire

Received: 2 January 1973   

The galls on Forsythia intermedia Zab. consist of much-branched, root-like structures embedded in corky material which appears to be sloughed-off from them. These gall ‘roots’ have 7 to 14 vascular bundles compared with the 5 of normal roots and contain much more IAA.

When galls were incubated in damp chambers the gall ‘roots’ extended their growth. These extensions had a root-cap and root-hairs but also had more vascular bundles than normal and they did not respond geotropically like normal roots.

Two fungi, Gibberella baccata (Wallr.) Sacc. (conid, stat. Fusarlum lateritium Nees.) and Phomopsis dominici Trav. were associated with die-back of gall ‘roots’ and two bacteria resembling Corynebacterium fascians (Til.) Dowson and Agrobacterium tumefaciens (Sm. and Towns.) Conn respectively were isolated from galls. All produced IAA in culture media but their role in the etiology of the gall, if any, remains in doubt.


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