New Zealand Journal of Botany abstract
Ice formation and foliar frost resistance in attached and excised shoots from
seedlings and adult trees of Nothofagus menziesii
G. NEUNER*
P. BANNISTER
Department of Botany
University of Otago
P. O. Box 56
Dunedin, New Zealand.
* Present address: Institut für Botanik, Abteilung Allgemeine Botanik,
Universität Innsbruck,
Sternwartestrasse 15, A-6020 Innsbruck, Austria
W. LARCHER
Institut für Botanik
Abteilung Allgemeine Botanik
Universität Innsbruck
Sternwartestrasse 15
A-6020 Innsbruck, Austria
Abstract Freezing in leaves of N. menziesii was
monitored by experimental freezing of attached twigs and seedlings growing
naturally in a forest site and compared with a routine laboratory test in which
excised plant material was used. Major differences in ice nucleation were
observed: ice formed in attached leaves in situ at temperatures that
were on average 4deg.C higher than in excised leaves, in both seedlings and
adult trees. Excision did not affect the symptoms of frost damage. Mean foliar
frost resistance was 2deg.C lower in seedlings than in mature shoots, and about
1deg.C lower in shoots measured in situ than in excised shoots.
Keywords Nothofagus; broad-leaved evergreen tree;
differential thermal analysis (DTA); supercooling; ice nucleation; frost
resistance
B96014
Received 16 February 1996; accepted 7 November 1996
PDF file of entire paper: medium quality (614K); (scanned from paper original: notes about this process)
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