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Polyamine metabolism in sunflower plants under long-term cadmium or copper stress

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Summary.

The effect of different doses of cadmium and copper was studied in relation to growth and polyamine (Pas) metabolism in shoots of sunflower plants. Cadmium accumulated to higher levels than copper and shoot length was reduced by 0.5 and 1 mM Cd, but only by 1 mM Cu. At 1 mM of Cd or Cu, Put content increased 270% and 160% with Cd2+ and Cu2+, respectively. Spermidine (Spd) was modified only by 1 mM Cd, while spermine (Spm) declined after seeds germinated, increasing thereafter but only with 1 mM Cd or Cu (273% over the controls for Cd and 230% for Cu at day 16). Both ADC and ODC activities were increased by 1 mM Cd, whereas 1 mM Cu enhanced ADC activity, but reduced ODC activity at every concentration used. The role of Pas as markers of Cd or Cu toxicity is discussed.

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Abbreviations

ADC:

arginine decarboxylase

DAO:

diamine oxidase

ODC:

ornithine decarboxylase

Pas:

polyamines

Pro:

proline

Put:

putrescine

Spd:

spermidine

Spm:

spermine

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  1. Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina

    M. D. Groppa, M. P. Ianuzzo, M. L. Tomaro & M. P. Benavides

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  1. M. D. Groppa
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  2. M. P. Ianuzzo
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  3. M. L. Tomaro
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  4. M. P. Benavides
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Groppa, M., Ianuzzo, M., Tomaro, M. et al. Polyamine metabolism in sunflower plants under long-term cadmium or copper stress. Amino Acids 32, 265–275 (2007). https://doi.org/10.1007/s00726-006-0343-9

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