Polyamine metabolism in sunflower and wheat leaf discs under cadmium or copper stress

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Polyamines: potent modulators of plant responses to stress (2013, background): “In wheat leaves, the increase in Put content under metals treatments could also be due to an inhibition of DAO activity, which leads to a lower degradation of Put and this fact might contribute to the higher Put content observed under Cd2 treatment (Groppa et al. 2003).”
Polyamines reduce salt-induced oxidative damage by increasing the activities of antioxidant enzymes and decreasing lipid peroxidation in Virginia pine (2005, methodology): “The enzyme activities were calculated by the method of Groppa et al. (2003) .”
Polyamines and abiotic stress: recent advances (2007, background): “Copper also decreased ADC activity but did not modified ODC and DAO activities, thus the decrease in ADC activity might be responsible of the reduced Put levels observed (Groppa et al., 2003).”