Phosphorus uptake and translocation in salt-stressed melon plants |
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Authors: | Josefa Marí a Navarro, Marí a Angeles Botella, Antonio Cerd ,Vicente Martinez |
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Affiliation: | Josefa María Navarro, María Angeles Botella, Antonio Cerdá,Vicente Martinez, |
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Abstract: | Melon seedlings (Cucumis melo L. cv.Galia) were grown hydroponically to study the effect of salinity (80 mmol/LNaCl) on phosphate (Pi) uptake and translocation at two levels of Pi (25 μmol/L and 1 mmol/L). Net uptake rates of Pi were determined by depletionof the medium and by plant content. Salinity decreased Pi uptake at low Pi (high affinity uptake mechanism), 25 μmol/L, although no specific competitive inhibition of Pi uptake by Cl− was observed. When plants were grown with high Pi (1 mmol/L), the uptake of Pi through the low affinity system was increased by 80 mmol/L NaCl. Salinity also reduced the phosphorus flux, as Pi, through the xylem. It is hypothesised that high levels of NaCl decrease the mobility of Pi stored in vacuoles, and as a result, inhibit export from this storage compartment to other parts of the plant. |
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Keywords: | Cucumis melo phosphorus translocation phosphorus uptake salinity |
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