New Zealand Journal of Botany abstracts
The frost resistance of juvenile and adult forms of some heteroblastic New
Zealand plants
HEATHER E. DARROW
PETER BANNISTER*
DAVID J. BURRITT
Department of Botany
University of Otago
P.O. Box 56
Dunedin, New Zealand
PAULA E. JAMESON
Institute of Molecular Sciences
Massey University
Private Bag 11222
Palmerston North, New Zealand
Abstract Many New Zealand trees are heteroblastic, with
juvenile forms that differ markedly from the form of the adult tree. Their
phase change corresponds with the transition from cold air near the ground to
warmer air above. Heteroblastic species, therefore, might be expected to have
juvenile forms that are more frost resistant than their mature forms. Juvenile
forms of
Streblus heterophyllus and
Sophora microphylla were more
frost resistant than their mature forms and the juvenile and adult forms of the
homoblastic
Pittosporum eugenioides showed no consistent differences in
their frost resistance. Juvenile forms of
Carpodetus serratus,
Hoheria angustifolia,
Plagianthus regius, and
Pseudopanax
crassifolius were less frost resistant than their mature counterparts. We
conclude that juvenile forms are not inherently more frost resistant than their
equivalent mature forms and note that populations of the same species from
different environments readily acquire the frost resistance appropriate to
their habitat.
Keywords climate; frost resistance; heteroblasty; juvenile;
mature; Pseudopanax crassifolius; Streblus heterophyllus;
Pittosporum eugenioides; Sophora microphylla; Carpodetus
serratus; Hoheria angustifolia; Plagianthus regius; New
Zealand
New Zealand Journal of Botany, 2001, Vol. 39: 355-363
0028-825X/01/3902-0355 $7.00 (c) The Royal Society of New Zealand 2001
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