Space and time dependence of temperature and freezing in evergreen leaves Ball, Marilyn en_US Wolfe, Joseph en_US Canny, Martin en_US Hofmann, Martin en_US Nicotra, Adrienne en_US Hughes, Dale en_US 2021-11-25T13:08:50Z 2021-11-25T13:08:50Z 2002 en_US
dc.description.abstract Infrared video thermography was used to study space and time dependence of freezing in intact, attached leaves of snow gum (Eucalyptus pauciflora Sieb. ex Spreng.) seedlings. Freezing initiated in the midvein and spread through the apoplast at 10 mm s-1. Freezing of apoplastic water was detected by a local, rapid increase in temperature, and was followed by a slower increase in leaf temperature to the equilibrium freezing temperature as symplastic water moved from cells to extracellular sites of ice formation. The duration of freezing varied with position, leaf thickness and water content. Most of the cellular water in the leaf tip and margins froze quickly, while freezing was slower near the petiole and midvein. Regions that had frozen more rapidly then began to cool more rapidly, producing steep gradients in leaf temperatures and hence also freeze-induced dehydration. Thus, spatial variation in physical properties of leaves could affect the distribution of minimum leaf temperatures, and hence, the distribution and extent of damage due to freeze-induced dehydration. These results are consistent with patterns of freezing damage in autumn when the duration of freezing may be insufficient for the whole leaf to freeze before sunrise, and may explain the general observation of increased leaf water content and thickness with altitude. en_US
dc.identifier.issn 1445-4408 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.title Space and time dependence of temperature and freezing in evergreen leaves en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.description.notePublic Author webpage: en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 11 en_US
unsw.relation.ispartofjournal Functional Plant Biology en_US
unsw.relation.ispartofpagefrompageto 1259-1272 en_US
unsw.relation.ispartofvolume 29 en_US
unsw.relation.originalPublicationAffiliation Ball, Marilyn en_US
unsw.relation.originalPublicationAffiliation Wolfe, Joseph, Physics, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Canny, Martin en_US
unsw.relation.originalPublicationAffiliation Hofmann, Martin en_US
unsw.relation.originalPublicationAffiliation Nicotra, Adrienne en_US
unsw.relation.originalPublicationAffiliation Hughes, Dale en_US School of Physics *
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