Premium
Rapid Effects on Ion and Water Uptake Induced by Changes of Water Potential in Young Wheat Plants
Author(s) -
ERLANDSSON GUNVOR
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.tb03903.x
Subject(s) - chemistry , sodium , ion , shoot , humidity , peg ratio , chloride , nutrient , inorganic ions , ion transporter , environmental chemistry , agronomy , biology , physics , organic chemistry , finance , economics , thermodynamics
The effect of rapid changes in the water potential of the root medium or the atmosphere was investigated with particular respect to water and ion uptake in young wheat plants. Either PEG 400 or PEG 6000 were added to the nutrient solution, so that the water potential was decreased from about 0 to –5 bars and –13 bars, respectively. Both water and ion uptake immediately decreased when the water potential of the medium was reduced. By raising the humidity around the shoots from 1400 N m −2 (60% RH) to about 2300 N m −2 (100% RH) water uptake decreased, whereas ion uptake transiently increased. If sodium chloride was added to reduce the water potential of the mutrient solution, ion uptake was found to decrease to essentially the same level as when PEG was used. It is suggested that a change in the water potential of the plants has effects on the active‐ion‐transport mechanism.