SELECTION OF BLACK POPLARS FOR WATER USE EFFICIENCY

Photosynthesis, transpiration, water use efficiency (WUE) and biomass production have been investigated in nine black poplar clones (section Aigeiros) in three fi- eld experiments. Eastern cottonwood clones (Populus deltoides) had the highest net pho- tosynthesis and water use efficiency. European black poplar clones had the highest transpi- ration intensity. Correlation analysis showed that net photosynthesis was in a high positive correlation with biomass. Medium negative correlations existed between WUE and net pho- tosynthesis, transpiration and biomass and WUE and biomass. The study showed a pronoun- ced interclonal variability of the physiological and growth characters under study.