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Salt‐induced inhibition of phosphorus transport in lettuce plants
Author(s) -
Martinez Vicente,
Bernstein Nirit,
Läuchli André
Publication year - 1996
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1996.tb00487.x
Subject(s) - lactuca , shoot , chromosomal translocation , salinity , phosphorus , chemistry , salt (chemistry) , nutrient , horticulture , vacuole , botany , biology , biochemistry , cytoplasm , ecology , organic chemistry , gene
Experiments with labeled phosphorus ( 32 P) were carried out to study the effect of NaCl (80 m M ) on transport of inorganic phosphorus (P 1 ) in the salt sensitive lettuce plant ( Lactuca sativa L. cv. Black‐seeded Simpson). The concentration of P 1 used in all experiments was 0.1 m M . Salinity inhibited 32 P uptake by the roots as well as translocation of 32 P 1 from root to shoot. When the plants were exposed for 3 h to a nutrient solution containing 32 P, 80 m M NaCl reduced 32 P, translocation from root to shoot by 21%. This inhibition increased to 85% during a subsequent 3‐h period in unlabeled solution.‐ The concentration of 32 P 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 P 1 from old to young leaves. It is hypothesized that high levels of NaCl decrease the mobility of P 1 stored in vacuoles and, as a result, inhibit export from this storage compartment to other parts of the plant.