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    STUDIA PHYSICA - Ediţia nr.1 din 2004  
         
  Articol:   ISOTOPIC COMPOSITION OF PLANT CARBON CORRELATES WITH WATER-USE EFFICIENCY.

Autori:  STELA CUNA, GABRIELA BALAS, O. COZAR. 		 
       
         
  Rezumat:  Agricultural productivity is limited by water availability. One solution to this problem is to select and breed plants requiring less water for growth, i.e. to increase water-use efficiency (WUE). We study the use of carbon isotope analysis from plant material as a tool for investigating WUE. For that purpose we have used the theoretical models relating stable carbon isotope discrimination () from leaf of the plant and WUE. The correlation between WUE and  was assessed in five plants: Malus domestica, Zea mays, Robinia pseudacacia, Juglans regia and Castanea nativa.  was determined by the analyze of carbon isotopic composition from leaves. Carbon from plant material was converted to CO2 by dry combustion in an excess of oxygen and then was analyzed for stable isotope ratio measurements by mass spectrometry. A negative correlation between WUE and  was established for these plants. It is suggested that carbon isotope analysis may be a useful tool in selection for improved water-use efficiency of some plant obtained "in vitro" by biotechnological processes.  
         
     
         
         
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