Effect of Pb ions on superoxide dismutase and catalase activities in leaves of pea plants grown in high and low irradiance |
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Authors: | E Romanowska B Wróblewska A Drożak M Zienkiewicz M Siedlecka |
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Institution: | (1) Department of Biology, College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin, 300387, People’s Republic of China;(2) Library, Tianjin Normal University, Tianjin, 300387, People’s Republic of China |
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Abstract: | The role of irradiance on the activity of antioxidant enzymes: superoxide dismutase (SOD) and catalase (CAT) was examined
in the leaves of Pisum sativum L. plants grown under low (LL) or high (HL) irradiance (PPFD 50 or 600 μmol m−2 s−1) and exposed after detachment to 5 mM Pb (NO3)2 for 24 h. The activities of both enzymes increased in response to LL compared with HL and no effect of Pb ions was observed.
Photosystem (PS) 1 and PS 2 activities were also investigated in chloroplasts isolated from these leaves. LL lowered PS 1
electron transport rate and changes in photochemical activity of PS 1 induced by Pb2+ were visible only in the chloroplasts isolated from leaves of LL grown plants. PS 2 activity was influenced similarly by
Pb ions at both PPFD. This study demonstrates that leaves of HL grown plants were less sensitive to lead toxicity than those
from LL grown plants. Changes in electron transport rates were the main factors responsible for the generation of reactive
oxygen species in the chloroplasts and as a consequence, in induction of antioxidant enzymes. |
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