Short term exposure of UV-B radiation enhances salinity tolerance in Vigna radiata
2012
Hamid, N. (Karachi Univ. (Pakistan). Dept. of Botany) | Hussain, H. (Karachi Univ. (Pakistan). Dept. of Botany) | Jawaid, F. (Karachi Univ. (Pakistan). Dept. of Botany) | Rahman, A.
Electromagnetic radiation (7%) emitted from the sun is in the UV range (200-400) nm. Several morphological and anatomical changes have been reported from plants grown under long-term UV-B regimes. The effect of UV-B radiation (280-320nm) and salinity alone and in combination were studied. Fifteen days old seedlings of Vigna radiata were exposed to UV-B radiation for 10, 20 and 30 minutes and salinity treatment was given to the plants 3 days before the UV-B treatment. UV radiation was artificially provided by Esco Airstream Vertical Laminar Flow Cabinet (AVC-4AI). Significant decrease (p less than 0.05) in root and shoot length, specific leaf area, chlorophyll and carotenoid content of in all UV-B and salinity treatments was observed as compared to control. The reduction was more pronounced in salinity treatment as compared to UV-B alone and combination of UV-B with salinity. It is concluded that the short term exposure of UV-B radiation enhances the salinity tolerance in Vigna radiata.
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