Document Detail

Roles of cell walls and intracellular contents in supercooling capability of xylem parenchyma cells of boreal trees.
MedLine Citation:
PMID:  22901079     Owner:  NLM     Status:  Publisher    
The supercooling capability of xylem parenchyma cells (XPCs) in boreal hardwood species differs depending not only on species but also season. In the present study, the roles of cell walls and intracellular contents in supercooling capability of XPCs were examined in three boreal hardwood species, Japanese beech, katsura tree and mulberry, whose supercooling capability differs largely depending on species and season. XPCs in these species harvested in winter and summer were treated by rapid freezing and thawing (RFT samples) or by RFT with further washing (RFTW samples) to remove intracellular contents from XPCs in order to examine the roles of cell walls in supercooling. RFT samples were also treated with glucose solution (RFTG samples) to examine roles of intracellular contents in supercooling. The supercooling capabilities of these samples were examined by differential thermal analysis after ultrastructural observation of XPCs by a cryo-scanning electron microscope to confirm effects of the above treatments. XPCs in RFTW samples showed a large reduction in supercooling capability to similar temperatures regardless of species or season. On the other hand, XPCs in RFTG samples showed a large increase in supercooling capability to similar temperatures regardless of species or season. These results indicate that although cell walls have an important role in maintenance of supercooling, change in supercooling capability of XPCs is induced by change in intracellular contents but not by change in cell wall properties.
Jun Kasuga; Keita Endoh; Megumi Yoshiba; Ippei Taido; Keita Arakawa; Matsuo Uemura; Seizo Fujikawa
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-17
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © Physiologia Plantarum 2012.
Cryobiofrontier Research Center, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan.
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