Document Detail

Changes in the composition of xylem sap during development of the spadix of skunk cabbage (Symplocarpus foetidus).
MedLine Citation:
PMID:  15973047     Owner:  NLM     Status:  MEDLINE    
The spadix of skunk cabbage, Symplocarpus foetidus, is thermogenic and maintains an internal temperature of around 20 degrees C even when the ambient air temperature drops below freezing. This homeothermic heat production is observed only during the stigma stage, and thereafter ceases at the male stage when pollen is shed. To clarify the regulatory mechanism by which the stigma stage-specific heat production occurs in the spadix, sugars, organic acids, and amino acids in xylem sap were analyzed and compared with those of post-thermogenic plants. Interestingly, no significant difference was observed in the total volume of xylem sap per fresh weight of the spadix between thermogenic (31.2+/-24.7 microl h(-1) g(-1)) and post-thermogenic (50.5+/-30.4 microl h(-1) g(-1)) plants. However, concentrations of sugars (sucrose, glucose, and fructose), organic acids (malate and succinate), and amino acids (Asp, Asn, Glu, Gln, Gly, and Ala) in xylem sap decreased remarkably in post-thermogenic plants. Our results indicate that the composition of the xylem sap differs during the development of the spadix of S. foetidus.
Yoshihiko Onda; Kikukatsu Ito
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Bioscience, biotechnology, and biochemistry     Volume:  69     ISSN:  0916-8451     ISO Abbreviation:  Biosci. Biotechnol. Biochem.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-06-23     Completed Date:  2005-10-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9205717     Medline TA:  Biosci Biotechnol Biochem     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1156-61     Citation Subset:  IM    
Cryobiosystem Research Center, Faculty of Agriculture, Iwate University, Morioka, Japan.
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MeSH Terms
Amino Acids / analysis
Araceae / growth & development*,  metabolism*
Citric Acid / analysis
Fructose / analysis
Glucose / analysis
Hot Temperature
Malates / analysis
Plant Components, Aerial / growth & development,  metabolism*
Succinic Acid / analysis
Sucrose / analysis
Reg. No./Substance:
0/Amino Acids; 0/Malates; 110-15-6/Succinic Acid; 30237-26-4/Fructose; 50-99-7/Glucose; 57-50-1/Sucrose; 6915-15-7/malic acid; 77-92-9/Citric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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