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Effects of Ionic Strength of Nutrient Solutions on Phosphate Uptake by Sunflower
Author(s) -
PETTERSSON SUNE
Publication year - 1975
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.1399-3054.1975.tb03796.x
Subject(s) - phosphate , salt (chemistry) , ionic strength , sunflower , chemistry , nutrient , inorganic phosphate , ion , ionic bonding , inorganic chemistry , agronomy , biochemistry , aqueous solution , biology , organic chemistry
Active phosphate uptake by the roots of young sunflower plants was stimulated nonspecifically by increasing the total salt concentration of the uptake solution. Inhibition of active uptake by DNP‐treatment removed the salt stimulation. Independently of the rate of active uptake the amount of phosphate present in the free space of the roots increased as the salt concentration was raised. It is suggested that at low ionic strength of the nutrient solution the initial passive step of ion transport through the root free space can limit the overall uptake rate.