Journal
ACTA BIOLOGICA HUNGARICA
Volume 59, Issue 2, Pages 247-258Publisher
AKADEMIAI KIADO ZRT
DOI: 10.1556/ABiol.59.2008.2.10
Keywords
Azolla pinnata; Azolla filiculoides; flavonoids; growth; lipid peroxidation; proline; peroxidase; superoxide dismutase
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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 considerably due to all UV-B treatments. However, the reduction was found to be severe in A. filiculoides as compared to A. pinnata. The level of UV-absorbing compound flavonoids increased significantly in A. pinnala plants whereas only a slight increase in the flavonoid content was observed in A. filiculoides . UVB exposure led to enhanced production of malondialdehyde (MDA) and electrolyte leakage in A. filiculoides than A. pinnata. 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 A. pinnala to be better tolerant to UVB as compared with A. filiculoides which appears to be sensitive.
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