New Zealand Journal of Botany abstract
+Author for correspondence
B97060
Received 25 August 1997;
accepted 9 February 1998
In vitro abscission of kauri (Agathis australis)
branches
VIVIENNE R. WILSON*
KEVIN S. GOULD+
PETER H. LOVELL
Plant Science Research Group
School of Biological Sciences
The University of Auckland
Private Bag 92019
Auckland, New Zealand
JENNY AITKEN-CHRISTIE
Carter Holt Harvey Forests Ltd
New Zealand Forest Biotechnology Centre
P. O. Box 2463
Rotorua, New Zealand
* Present address: Centre for Forest
Biology,
University of Victoria, Victoria, British Columbia V8W
2Y2, Canada.
Abstract When nodal explants from tips of horizontal branches
of seedling
Agathis australis (Araucariaceae) are cultured
in
vitro, the distal 3 mm of internode progresses through a series of
morphological and anatomical changes, and ultimately detaches. Changes include:
desiccation; regional chlorosis; internode swelling associated with
proliferation and radial expansion of cortical parenchyma; interruption of
vascular contiguity by invading vascular parenchyma; necrosis and separation.
Explants from material older than one growth flush, and those from orthotropic
axes, do not exhibit this syndrome. Second-generation explants show internode
abscission, regardless of age of parent material. The technique may be a useful
experimental system for studying branch cladoptosis in woody species.
Keywords kauri; Agathis australis; branch abscission;
in vitro culture; nodal explants
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