A. Stroinski et M. Zielezinska, CADMIUM EFFECT ON HYDROGEN-PEROXIDE, GLUTHATIONE AND PHYTOCHELATINS LEVELS IN POTATO-TUBER, Acta Physiologiae Plantarum, 19(2), 1997, pp. 127-135
Short-term treatment of potato tuber (Solanum tuberosum L.) discs with
CdCl2 (1 mM) induced an oxidative stress, manifested by higher levels
of H2O2, and activated the synthesis of phytochclatins ((gamma-Glu-Cy
s)(n)-Gly): PC2, PC3 and PC4. If in the tissues with a lower GSH level
, the oxidative stress was induced by treatment with 3-aminotriazol (A
T), or with AT and H2O2 the elevation of H2O2 and GSH levels and then
some accumulation of thiols, includiug PC2, PC3 and PC4, were observed
. However. this increase of PC concentration was considerably lower wh
en compared with the effects brought about by Cd+2 treatment. If such
a procedure of evoking subsequent moderate oxidative stress in tissues
preceded Cd-treatment, a marked limitation of PC synthesis was observ
ed. The presented results support the role of H2O2 as the second messe
nger in activating GSH synthesis and thus suggest a possibility of red
ox type regulation mechanism of PCs synthesis.