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RESPONSE OF PHRAGMITES AUSTRALIS TO WATER STRESS FROM FLOODING TO DROUGHT

M.A. ELHAAK, A. SHARAF EL-DIN AND R.H. SAMMOUR

Abstract: Leaf samples of Phragmites australis collected from five locations varying from totally flooded to dry regime showed a sharp decrease in the fresh leaf water content of the plant from flooding to dry locations accompanied by an incomparable decrease in OP. This incremental osmotic regulation occurred due to the accumulation of soluble sugars, amino acids, proteins, proline and the nutrient elements K, Na, Ca, Mg and Fe. Low OP under flooding was attributed to the condensation of sugars and amino acids into polysaccharides and protein. Both drought and flooding conditions n:sulted in the accumulation of polysaccharides, protein and proline.

Department of Botany, Faculty of Science, Tanto University, Tanto, Egypt.