Document Detail

Extracellular freezing in leaves of freezing-sensitive species.
MedLine Citation:
PMID:  11882950     Owner:  NLM     Status:  MEDLINE    
Low-temperature scanning-electron microscopy was used to study the freezing of leaves of five species that have no resistance to freezing: bean (Phaseolus vulgaris L.), tobacco (Nicotiana tabacum L.), tomato (Lycopersicon esculentum L.), cucumber (Cucumis sativus L.), and corn (Zea mays L.). In the leaves of the four dicotyledonous species, ice was extracellular and the cells of all tissues were collapsed. In contrast, in maize leaves ice was extracellular in the mesophyll, and these cells were collapsed, but the epidermal and bundle-sheath cells apparently retained their original shapes and volume. It is concluded that the leaves of the freezing-sensitive dicotyledonous species tested were killed by cellular dehydration induced by extracellular freezing, and not by intracellular freezing. Freezing injury in maize leaves apparently resulted from a combination of freezing-induced cellular dehydration of some cells and intracellular ice formation in epidermal and bundle-sheath cells.
Edward N Ashworth; Roger S Pearce
Publication Detail:
Type:  Journal Article     Date:  2001-12-07
Journal Detail:
Title:  Planta     Volume:  214     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2002 Mar 
Date Detail:
Created Date:  2002-03-07     Completed Date:  2002-06-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  798-805     Citation Subset:  IM    
Department of Horticulture and Landscape Architecture, 1165 Horticulture Building, Purdue University, West Lafayette, IN 47907-1165, USA.
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MeSH Terms
Angiosperms / cytology,  physiology*
Cucumis sativus / cytology,  physiology
Extracellular Space / physiology
Ice / adverse effects
Lycopersicon esculentum / cytology,  physiology
Phaseolus / cytology,  physiology
Plant Epidermis / cytology,  physiology
Plant Leaves / cytology,  physiology*
Solanaceae / cytology,  physiology
Tobacco / cytology,  physiology
Zea mays / cytology,  physiology
Reg. No./Substance:

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