Abstract
Experiments with labeled phosphorus (32P) were carried out to study the effect of NaCl (80 mM) on transport of inorganic phosphorus (P1) in the salt sensitive lettuce plant (Lactuca sativa L. cv. Black‐seeded Simpson). The concentration of P1 used in all experiments was 0.1 mM. Salinity inhibited 32P uptake by the roots as well as translocation of 32P1 from root to shoot. When the plants were exposed for 3 h to a nutrient solution containing 32P, 80 mM NaCl reduced 32P, translocation from root to shoot by 21%. This inhibition increased to 85% during a subsequent 3‐h period in unlabeled solution.‐ The concentration of 32P in leaves increased with decreasing leaf age regardless of the salinity level and leaf size. Indirect evidence supports the proposal that NaCl inhibits the retranslocation of P1 from old to young leaves. It is hypothesized that high levels of NaCl decrease the mobility of P1 stored in vacuoles and, as a result, inhibit export from this storage compartment to other parts of the plant.
Published Version
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