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Na + and K + transport in excised soybean roots
Author(s) -
Lacan D.,
Durand M.
Publication year - 1995
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 - 10.1034/j.1399-3054.1995.930119.x
Subject(s) - xylem , reabsorption , chemistry , shoot , water transport , ion transporter , ion , biophysics , chromosomal translocation , botany , biochemistry , biology , sodium , water flow , organic chemistry , environmental engineering , gene , engineering
Uptake, accumulation and xylem transport of K + and Na + in excised roots of soybean were investigated by use of a perfusion technique. This technique permitted independent quantification of, on the one hand, entry of ions into the roots and their transport through the cortex to the xylem vessels, and on the other hand reabsorption from the xylem vessels to the neighbouring cells and the external medium. Data are consistent with a low degree of selective uptake of K + over Na + . However, Na + depletion of the xylem stream by reabsorption limits, although weakly, its translocation to the shoots. Na + reabsorbed is for a great part reexcreted into the external medium. The low efficiency of these processes is discussed in relation to the Na + sensitivity of soybean.