| Pak. J. Bot., 37(1): 141-148, 2005. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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SEASONAL VARIATION IN WATER RELATIONS OF HALOPYRUM MUCRONATUM (L.) STAPF. GROWING NEAR SANDSPIT, KARACHI IRFAN AZIZ*, SALMAN GULZAR**, MEHER NOOR AND M. AJMAL KHAN
Abstract:
Halopyrum mucronatum (L) Stapf., is a salt tolerant grass found
on the coastal dunes of Arabian Sea. Seasonal variations in water relations
of H. mucronatum were studied near Sandspit, Karachi over a one-year
period. Water and osmotic potentials were higher during the monsoon
(July and August), stomatal conductance was high and plants maintained
turgor. Water potential, osmotic potential and stomatal conductance
decreased with increasing soil electrical conductivity. This indicates
that plants minimize their water uptake during stress to achieve osmotic
adjustment, which helps them to survive in desert ecosystem. Department of Botany, University of Karachi, Karachi-75270, Pakistan.
Department of Botany, Government Degree Science and Commerce College, Orangi Town,
Karachi, Karachi-75800, Pakistan. |
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