Paper Information

Journal:   IRANIAN JOURNAL OF BIOLOGY   Winter 2004 , Volume 16 , Number 4; Page(s) 28 To 46.
 
Paper: 

STUDY OF ENVIRONMENTAL CONDITIONS ON CARBOHYDRATES CHANGES IN THREE SPECIES OF EUCALIPTUS: E. CAMADULENSIS DEHNH, E. VIMINALIS LABILL, E. FROTICETORUM MUELL

 
 
Author(s):  EBRAHIMZADEH H., ABBASI M.R., TABATABAEI M.F.
 
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Abstract: 

To acquire a biochemical marker of carbohydrate in the different ecological conditions and season in Eucalyptus camaldulensis, E. froticetorum and E. viminalis, this study were done. The materials were the new shoots of trees. These materials were collected during winter (January), spring (May) and summer (July) from Zagheh-Marz (in Mazandaran province), NoorAbad-eMamesani (in Fars province) and Malavi (in Lorestan province).The non-structural carbohydrates were extracted. These sugars were quantitatively and qualitatively analyzed based on spectrophotometry, thin layer chromatography, gas liquid chromatography and gas chromatography-mass spectrometery. The reducing sugars (monosaccharides), non-reducing sugars (oligosaccharides) and polysaccharides differed from 3.45 to 18.9 mg/g DW, 10.2 to 47.3 mg/g DW and 8.18 to 25.77 mg/g DW respectively among of species and zones. The decrease of polysaccharides were accompanied by increase in the reducing sugars. In the zones with cold winter and hot summer, free sucrose and raffinose were increased, which played a role in the stress tolerance. The monosaccharides were identified as glucose, fructose, ramnose, xylose, fucose and ribose and uronic acids such as galacturonic acid and glucuronic acid. Sucrose and rafinose were identified as oligosacharides. Maltose is an oligosaccharid that is present in the most of plant species but no trace of maltose was detected in this study. There were no any starch or fructanic polymer as a polysaccharide in the studied Eucalyptus species. The structural monomers of storagepolysaccharide were identified as glucose, galactose, arabinose-mannose, ramnose, xylose, galacturonic acid and glucuronic acid. These monomers are the same as pectinic compounds, which are found in the cell wall compositions. The gas liquid chromatography showed that in regions with cold winter, the structural composition of polysaccharide were more glucose-galactose as monomer than arabinose-ramnose. Because in these conditions the storage polysaccharide is degradaded and then structural monomers for producing raffinose and its galactosides is produced. The produced oligosaccharides play in role of tolerance to cold stress via decreasing of melting point of water tissue and increasing of vacuolic syrup concentration.

 
Keyword(s): EUCALIPTUS, ENVIROMENTAL CONDITIONS, CARBOHYDRATES
 
References: 
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