Abstract
Tamarix ramosissima Ledeb cuttings were grown in solution culture with different levels of NaCl to determine some of its physiological responses t salinity. Yields, mineral composition, and gas exchange rates for CO 2 and H 2O were determined. Levels of NaCl of 10 to 200 mequiv./l tended to depress yields of leaves, stems, and roots. Most of the Na transported to leaves was excreted from the leaves via salt glands as revealed by analyses of washed and unwashed leaf samples. 25% or more of the K, Ca, Cu, Mn, B, Al, Si, Ti, Mo, Sr and Ba also was readily washed from leaves. Sodium was accumulated in large quantities when present in high concentrations in the nutrient substrate and Na appeared to decrease uptake of both K and Ca. The Na concentration in roots and stems was much lower than in leaves. Rates of photosynthetic carbon fixation and transpirational water loss changed very little with increasing salt treatment indicating that the observed growth decreases were due to energy losses through increased respiration and/or salt pumping.
Published Version
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