Response of growth and antioxidant enzymes in <i>Azolla</i> plants ( <i>Azolla pinnata</i> and <i>Azolla filiculoides</i> ) exposed to UV-B
2008
Masood, Amjad | Zeeshan, M. | Abraham, G.
Effect of ultravilolet-B (0.4 Wm <sup>−2</sup>) irradiation on growth, flavonoid content, lipid peroxidation, proline accumulation and activities of superoxide dismutase and peroxidase was comparatively analysed in <i>Azolla pinnata</i> and <i>Azolla filiculoides</i> . Growth measured as increment in dry weight reduced considerably due to all UV-B treatments. However, the reduction was found to be severe in <i>A. filiculoides</i> as compared to <i>A. pinnata</i> . The level of UV-absorbing compound flavonoids increased significantly in <i>A. pinnata</i> plants whereas only a slight increase in the flavonoid content was observed in <i>A. filiculoides</i> . UV-B exposure led to enhanced production of malondialdehyde (MDA) and electrolyte leakage in <i>A. filiculoides</i> than <i>A. pinnata</i> . Proline accumulation also showed a similar trend. Marked differences in the activity of antioxidant enzymes such as superoxide dismutase (SOD) and peroxidase (POD) was noticed in both the plants exposed to UV-B. Our comparative studies indicate <i>A. pinnata</i> to be better tolerant to UV-B as compared with <i>A. filiculoides</i> which appears to be sensitive.
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