Absorption and translocation of selenium by plants. [Bromus mollis; Hordeum vulgare]
The absorption of Se by the roots and its translocation to the shoots is being studied in the range grass, Bromus mollis. Seedlings are grown in a 0.1 modified Hoagland solution which is minus SO/sub 4//sup 2 -/ for 3 days before the experiment. Se is supplied as Na/sub 2/SeO/sub 4/ at 2.5 ..mu..M. The gamma emitting /sup 75/Se is used as a tracer. Se is translocated to the shoots quickly following its absorption; after 20 minutes the Se concentration in the shoots exceeds that in the roots. The influence of pH and of other anions (i.e. SO/sub 4//sup 2 -/, SiO/sub 3//sup 2 -/, NO/sub 3//sup -/, and Cl/sup -/) on the absorption and translocation of this element is currently being examined. Absorption of Se by excised barley (Hordeum vulgare cv. Arivat) roots follows Michaelis-Menten kinetics over the 2.5-100 ..mu..M range; a low-affinity mechanism comes into play at higher concentrations. Absorption by the former (high-affinity) mechanism is competitively inhibited by SO/sub 4//sup 2 -/, is little affected by NO/sub 3//sup -/ and Cl/sup -/, and is pH dependent. Over the 4-8 pH range absorption was maximal at pH 4, but only twice that found at pH 8.
- Research Organization:
- Univ. of California, Davis
- OSTI ID:
- 5600912
- Report Number(s):
- CONF-8707108-
- Journal Information:
- Plant Physiol., Suppl.; (United States), Vol. 83:4; Conference: Annual meeting of the American Society of Plant Physiologists, St. Louis, MO, USA, 19 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ROOT ABSORPTION
BIOCHEMICAL REACTION KINETICS
SELENIUM
TRANSLOCATION
ANIONS
BARLEY
BIOLOGICAL LOCALIZATION
GRASS
INHIBITION
LABELLED COMPOUNDS
PH VALUE
SEEDLINGS
SELENIUM 75
SULFATES
TRACER TECHNIQUES
ABSORPTION
BETA DECAY RADIOISOTOPES
CEREALS
CHARGED PARTICLES
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IONS
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
NUCLEI
OXYGEN COMPOUNDS
PLANTS
RADIOISOTOPES
REACTION KINETICS
SELENIUM ISOTOPES
SEMIMETALS
SULFUR COMPOUNDS
UPTAKE
560300* - Chemicals Metabolism & Toxicology
551001 - Physiological Systems- Tracer Techniques