New Zealand Journal of Botany abstract
B79040
Received 27 June 1997; accepted 22 December 1997
Adventitious root initiation, plasticity, and response to plant growth
regulator treatments of seedling, juvenile, and adult Elaeocarpus
hookerianus plants
JAMIE S. DAY*
KEVIN S. GOULD
School of Biological Sciences
The University of Auckland
Private Bag 92019
Auckland, New Zealand
PAULA E. JAMESON
Institute of Molecular BioSciences
Massey University
Private Bag 11222
Palmerston North, New Zealand
* Present address: CSIRO Division of Tropical Agriculture, 306
Carmody Road, St. Lucia, Queensland 4067, Australia.
Abstract We characterise the propagation success of cuttings
from juvenile and adult plants of the New Zealand endemic tree Elaeocarpus
hookerianus, and describe the response of seedling, juvenile, and adult
plants to various environmental and plant growth regulator treatments.
Unexpectedly, more adult cuttings formed roots than juveniles when cuttings
were taken during winter, but this was reversed when cuttings were taken during
summer. Juvenile plants displayed more variability in leaf properties in
response to shaded or glasshouse environments, and to gibberellic acid,
benzyladenine, or paclobutrazol treatments than seedlings or adult plants.
Juvenile plants displayed larger episodic changes in internode length along the
vertical axis than seedling or adult plants. No substantial maturation of
juvenile plants or rejuvenation of adult plants was observed following any of
the treatments. Age of the shoot appeared to be more important than the size of
the plant for control of the transition between juvenile and adult phases, and
for the expression of morphological and physiological properties characteristic
of each ontogenetic phase.
Keywords propagation; heteroblasty; plasticity; plant growth
regulators; Elaeocarpus hookerianus
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