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Sodium partitioning within the shoot of soybean
Author(s) -
Durand Monique,
Lacan Dominique
Publication year - 1994
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.1399-3054.1994.tb00660.x
Subject(s) - xylem , phloem , shoot , sodium , salinity , glycine , botany , chemistry , horticulture , biology , amino acid , biochemistry , ecology , organic chemistry
Uptake and partitioning of Na + and Cl − in plants of soybean ( Glycine max L. Merr. cv. Hodgson) exposed to moderate NaCl concentrations were studied over an 8‐day period. Plants showed marked retention of Na + in the stems and low transport to laminae of young leaves. The xylem sap ascending the main axis was progressively depleted in Na + . The oldest leaf greatly contributed to Na + depletion of the sap flowing to younger leaves. These results in combination with estimates of phloem recirculation indicated that Na + accumulation in the young leaf was prevented both by depletion of Na + from the xylem stream, and by a high recirculation of Na + via the phloem. However, this protection of young leaves was effective only for very mild salinity treatment.