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Leaf gas-exchange responses of A. souamosa seedlings to salinity were studied in sand culture in a series of glasshouse experiments. Trees were irrigated with a complete nutrient solution as the control, or with this solution amended to 3 or 6 dS/m with sea salt. Inhibition of net CO 2  assimilation, stomatal conductance of CO 2 , and transpiration was apparent 14 days after treatments were imposed, and continued to decline until day 30 to 35. The diurnal pattern of leaf gas exchange was not altered by salinity. Salinity reduced CO 2 , light energy, and water use efficiencies. Dark respiration and internal partial pressure of CO 2  were unaffected by salinity stress. Results indicated that substrate salinity inhibited photosynthesis of A. souamosa via limitations on mesophyll capacity for CO 2  assimilation and had little effect on gas phase limitations.

558 PB 377 SALINITY AND LEAF GAS-EXCHANGE OF ANNONA SOUAMOSA