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SEAWATER TOLERANCE IN RHIZOPHORA MUCRONATA
Abstract
Rhizophora mucronata, Lam. is found in the Miani Hor estuary, Balochistan and the indus delta. Its propagules were collected from Miani Hor (Sonmiani beach) and grown for one year in sandy soil. salinized with 0, 25, 50, 75 and 100% seawater fortified with nitrogen. The optimum growth of plants was obtained at 50% seawater. Plant height and leaf area was promoted at 50% seawater and significantly decreased with increasing salinity of the growth medium. The plants progressively adjusted their water potential in response to change in external water potential i.e. responded as osmoconformer. Concentrations of Nat and Cl- increased, while stomatal conductance decreased with increases in salinity.
