Abstract
In this work the physiological effect of copper excess on the peach rootstock MrS 2/5 and GF 677 was studied by means of an in vitro system. Two different copper treatments (10 and 100 µM CuSO4) for each rootstock were carried out and compared to a control containing 0.1 µM of CuSO4. Relative growth rate and copper concentration inside rootstock tissues were measured after 21 days from the beginning of the treatments and used to compare the genotypes’ reaction to copper excess. The GF 677 in vitro plantlets did not show any significant decrease in relative growth rate, while it increased in MrS 2/5 plantlets exposed to 100 µM CuSO4. In both rootstocks, the copper concentration in plantlet tissues increased when CuSO4 changed from 0.1 to 10 and 100 µM.
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