Journal
ENVIRONMENTAL POLLUTION
Volume 145, Issue 1, Pages 161-170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2006.03.025
Keywords
tobacco; metallothionein; genetic transformation; cadmium phytotoxicity; oxidative stress
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The response of tobacco plants (Nicotiana tabacian L.)-non-transformed and transformed with a metallothionein gene MThis from Silene vidgaris L.-to increase cadmium supply in the nutrient solution was compared. The transgenic plants accumulated significantly more Cd both in the roots and the leaves. Visual toxicity symptoms and disturbance in water balance were correlated with Cd tissue content. Treatment with 300 mu M CdCl2 resulted in inhibition of photosynthesis and mobilization of the ascorbate-glutathione cycle. Treatment with 500 mu M CdCl2 led to irreversible damage of photosynthesis and oxidative stress. An appearance of a new peroxidase isoform and changes in the leaf polypeptide pattern were observed at the highest Cd concentration. The level of non-protein thiols gradually increased following the Cd treatment both in transgenic and non-transformed plants., (c) 2006 Elsevier Ltd. All rights reserved.
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