Abstract
The effect of repeated severe pruning on endogenous free polyamine content in leaves and buds of adult hazel ( Corylus avellana L., cv. Negret) was studied. Polyamine levels varied in relation to pruning intensity, indicating that a reinvigorating phenomenon was taking place. The putrescine to spermidine plus spermine ratio increased significantly in relation to pruning, supporting the view that the metabolic dynamic of polyamines, more than the individual concentrations of any one of them, may participate in the control of plant ontogeny and the derived morphogenic potential. Differences in the polyamine content were observed in the studied hazel cv. Negret in comparison with previously published data on another hazel cultivar (`Gironell'), that can be related to the different morphogenic potential of both cultivars. This may indicate that genotypic differences affect both polyamine biosynthesis and metabolism as well as morphogenic expression, taking into account the genetic complexity of these processes.
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