Document Detail


Changes in soluble carbohydrates during storage of Caesalpinia echinata LAM. (Brazilwood) seeds, an endangered leguminous tree from the Brazilian Atlantic Forest.
MedLine Citation:
PMID:  16906306     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Caesalpinia echinata seeds stored in laboratory environmental conditions lose their viability in one month whilst under low temperatures germination is maintained for 18 months of storage. These seeds are tolerant to desiccation, keeping their viability up to 0.08 gH2O.gDW-1. Since soluble carbohydrates are believed to be involved with desiccation tolerance and seed storability, the aim of this work is to analyze the content and composition of soluble carbohydrates in C. echinata seeds during storage in paper bags (PB) and glass flasks (GF) at laboratory room (RT) and cool (CT) temperatures. In freshly harvested seeds, total soluble carbohydrates comprised approximately 10% of the dry weight, decreasing to ca. 8% over 18 months of storage at RT. In seeds stored at CT, sugars varied differently decreasing initially and being restored at the end of the analysis period. The main neutral sugars in seeds from all treatments were sucrose, fructose and glucose. Raffinose and stachyose were present as traces. Free myo-inositol and other cyclitols were also detected. The main tendency observed was the variation in levels of both glucose and fructose in relation to sucrose, the highest levels of monosaccharides which were found in seeds stored at CT. The values of glucose and fructose were practically constant in seeds stored in paper bags for 18 months at CT, decreasing consistently in the other treatments, mainly at RT. Sucrose contents remained relatively stable. Changes in soluble sugars during storage suggest that the loss of germinability of seeds of C. echinata could be associated with low levels of glucose and fructose in relation to sucrose.
Authors:
I S Garcia; A Souza; C J Barbedo; S M C Dietrich; R C L Figueiredo-Ribeiro
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brazilian journal of biology = Revista brasleira de biologia     Volume:  66     ISSN:  1519-6984     ISO Abbreviation:  Braz J Biol     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-08-14     Completed Date:  2007-04-12     Revised Date:  2007-09-06    
Medline Journal Info:
Nlm Unique ID:  101129542     Medline TA:  Braz J Biol     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  739-45     Citation Subset:  IM    
Affiliation:
Instituto de Botânica, CP 4005, CEP 01061-970, São Paulo, SP, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Brazil
Caesalpinia*
Carbohydrates / analysis*
Cryopreservation
Germination / physiology*
Preservation, Biological / methods*
Seeds / chemistry*,  growth & development
Solubility
Temperature
Time Factors
Chemical
Reg. No./Substance:
0/Carbohydrates

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


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