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    STUDIA BIOLOGIA - Ediţia nr.1 din 2004  
         
  Articol:   PEROXIDASE ACTIVITY, STOMATAL CONDUCTANCE AND CARBOHYDRATE METABOLISM IN SOYBEAN PLANTS UNDER HEAVY METAL STRESS.

Autori:  SILVIA ONAC, VICTORIA CRISTEA, MARTIN KEUL, DANA BÁTHORY, MIHAI TRIFU. 		 
       
         
  Rezumat:  The influence of heavy metals from mine spoils (Cavnic, Baia Mare mining area, Romania) on the guaiacol peroxidase (GPOD) activity, stomatal conductance and the content of carbohydrates in soybean leaves was studied. Soybean plants (Glycine max cvs. Agat and Diamant) were grown under field conditions in the following variants: control (unpolluted soil), 50% spoils+50% unpolluted soil, 100% spoils. The activity of GPOD increased in the leaves of both cvs. of soybean plants grown on 100% spoils and decreased in the plants of both cvs. cultivated on 50% spoils. Plants grown in spoil variants showed a decrease in stomatal conductance. The decrease was higher in plants from 100% spoil variant for both cultivars. For both cvs., the content of reducing carbohydrates and disaccharides increased in plants cultivated on 50% spoils and decreased in plants from 100% spoils, as compared to control, whereas the amount of starch diminished in plants from 50% spoil variant and increased in plants from 100% spoils, as compared to control. The results obtained suggest that heavy metals from mine spoils can induce oxidative stress in soybean plants, affecting the plant metabolism.  
         
     
         
         
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