Response of growth and antioxidant enzymes in Azolla plants ( Azolla pinnata and Azolla filiculoides ) exposed to UV-B

Masood, Amjad and Zeeshan, M. and Abraham, G. (2008) Response of growth and antioxidant enzymes in Azolla plants ( Azolla pinnata and Azolla filiculoides ) exposed to UV-B. Acta Biologica Hungarica, 59 (2). pp. 247-258. ISSN 0236-5383

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Abstract

Effect of ultravilolet-B (0.4 Wm –2 ) irradiation on growth, flavonoid content, lipid peroxidation, proline accumulation and activities of superoxide dismutase and peroxidase was comparatively analysed in Azolla pinnata and Azolla filiculoides . Growth measured as increment in dry weight reduced consider- ably due to all UV-B treatments. However, the reduction was found to be severe in A. filiculoides as com- pared to A. pinnata . The level of UV-absorbing compound flavonoids increased significantly in A. pin- nata plants whereas only a slight increase in the flavonoid content was observed in A. filiculoides . UV- B exposure led to enhanced production of malondialdehyde (MDA) and electrolyte leakage in A. filicu- loides than A. pinnata . Proline accumulation also showed a similar trend. Marked differences in the activ- ity 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 A. pinnata to be better tolerant to UV- B as compared with A. filiculoides which appears to be sensitive.

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