Root absorption and transport behavior of technetium in soybean

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.73.3.849· OSTI ID:6129963

Cataldo, D A; Wildung, R E; Garland, T R

The absorption characteristics and mechanisms of pertechnetate (TcO/sub 4//sup -/) uptake by hydroponically grown soybean seedlings (Glycine max cv Williams) were determined. Absorption from 10 micromolar solutions was linear for at least 6 hours, with 30% of the absorbed TcO/sub 4//sup -/ being transferred to the shoot. Evaluation of concentration-dependent adsorption rates from solutions containing 0.02 to 10 micromolar TcO/sub 4//sup -/ shows the presence of multiphasic absorption isotherms with calculated K/sub s/ values of 0.09, 8.9, and 54 micromolar for intact seedlings. The uptake of TcO/sub 4//sup -/ was inhibited by a 4-fold concentration excess of sulfate, phosphate, selenate, molybdate, and permanganate; no reduction was noted with borate, nitrate, tungstate, perrhenate, iodate, or vanadate. Analyses of kinetics of interaction TcO/sub 4//sup -/ and inhibiting anions show permanganate to be a noncompetitive inhibitor, while sulfate, phosphate, and selenate, and molybdate exhibit characteristics of competitive inhibitors of TcO/sub 4//sup -/ transport suggesting involvement of a common transport process.

• Research Organization: Battelle Pacific Northwest Lab., Richland, WA
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6129963
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 73; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ABSORPTION
ATMOSPHERES
BIOCHEMICAL REACTION KINETICS
BORATES
BORON COMPOUNDS
COMPARATIVE EVALUATIONS
CONTROLLED ATMOSPHERES
DISTRIBUTION
GLYCINE HISPIDA
HALOGEN COMPOUNDS
IODATES
IODINE COMPOUNDS
KINETICS
LEGUMINOSAE
MANGANESE COMPOUNDS
MINERAL CYCLING
MOLYBDATES
MOLYBDENUM COMPOUNDS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PERMANGANATES
PERRHENATES
PERTECHNETATES
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLANTS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
RESPONSE MODIFYING FACTORS
RHENIUM COMPOUNDS
ROOT ABSORPTION
SEEDLINGS
SELENATES
SELENIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TECHNETIUM COMPOUNDS
TISSUE DISTRIBUTION
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
UPTAKE
VANADATES
VANADIUM COMPOUNDS