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

GROPPA, MARÍA D.; IANUZZO, MARÍA P.; TOMARO, MARÍA L.; BENAVIDES, MARÍA P.

AMINO ACIDS

Springer

Lugar: Amsterdam; Año: 2007 vol. 32 p. 265 - 275

0939-4451

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 1mMCd, but only by 1mMCu. At 1mM of Cd or Cu, Put content increased 270% and 160% with Cd2+ and Cu2+, respectively. Spermidine (Spd) was modified only by 1mMCd, while spermine (Spm) declined after seeds germinated, increasing thereafter but only with 1mMCd or Cu (273%over the controls for Cd and 230%for Cu at day 16). Both ADC and ODC activities were increased by 1mM Cd, whereas 1mM 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.