Kinetics of Rb Absorption by Excised Barley Roots under Changing Rb Concentrations. I. Effects of Other Cations on Rb Uptake

Journal Article · Mon Jul 01 04:00:00 EDT 1963 · Plant Physiology (Bethesda)

DOI:https://doi.org/10.1104/pp.38.4.422· OSTI ID:4695050

Tanada, T.

The absorption of Rb⁸⁶applied as RbCl (10^-5 M) by excised barley roots (Hordeum vulgare L., var. Atlas 6) was studied by following the concentration changes and the amounts taken up by the roots during its absorption. Rb absorbed by roots was determined after they were washed several times with 2 x 10^-5 M KCl to remove all Rb adsorbed on superficial sorption sites. In the absence of interfering ions, the quantity of Rb disappearing from the solution agreed with that absorbed by the roots. K ions (2 x 10^-5 M) reduced equally both the amount of Rb disappearing from the solution and that taken up by the roots, resulting in both showing good agreement. In the presence of 2 x 10^-5 M Na, Ca, or Mg ions, however, Rb disappearance and absorption into roots were not only slowed down slightly, but the two quantities did not agree, less Rb was taken into the roots than that disappearing from the solution. A postuiate involving a chain of negative sites as possible pathways for cation entry into root cells is given to explain the results.

• Research Organization: Mineral Nutrition Lab., Beltsville, Md.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-028654
• OSTI ID: 4695050
• Journal Information: Plant Physiology (Bethesda), Journal Name: Plant Physiology (Bethesda) Journal Issue: 4 Vol. 38; ISSN 0032-0889
• Publisher: American Society of Plant Biologists
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ADSORPTION
BARLEY
CALCIUM
CATIONS
CEREALS
CLEANING
DIFFUSION
HORDEUM
MAGNESIUM
PLANT CELLS
POTASSIUM CHLORIDES
QUANTITATIVE ANALYSIS
QUANTITY RATIO
ROOTS
RUBIDIUM
RUBIDIUM 86
RUBIDIUM CHLORIDES
SODIUM
SOLUTIONS
TOXICITY
VARIATIONS