Lead-induced oxidative stress and metabolic alterations in Cassia angustifolia Vahl.
2007
Qureshi, M.I. | Abdin, M.Z. | Qadir, S. | Iqbal, M.
Forty-five-days old plants of Cassia angustifolia were subjected to 0-500 microM lead acetate (Pb-Ac) in pot culture. Changes in contents of thiobarbituric acid reactive substances (TBARS), ascorbate, glutathione, proline, sennosides (a+b), and activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), glutathione reductase (GR), and catalase (CAT) were studied at pre-flowering (60 d after sawing, DAS), flowering (90 DAS), and post-flowering (120 DAS) stages of plant development. Compared with the controls, the Pb-Ac treated plants showed an increase in contents of TBARS, dehydroascorbate, oxidized and total glutathione at all stages of growth. However, sennoside yield and contents of ascorbate and reduced form of glutathione declined. Proline content increased at 60 DAS but declined thereafter. Activities of SOD, APX, GR, and CAT were markedly increased. Sennoside content was higher at 60 and 90 DAS but lower at 120 DAS in comparison with control plants.
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