| Pak. J. Bot., 44(2): 841-844, 2012. | Back to Contents | ||||
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Updated: 26-04-12 | ||||
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SHORT TERM EXPOSURE OF
UV-B RADIATION ENHANCES SALINITY TOLERANCE IN VIGNA
RADIATA
Abstract:
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<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.
Department of Botany,
University of Karachi, Karachi-75270, Pakistan. |
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