Calcium and strontium absorption by corn roots in the presence of chelates

Journal Article · Wed Dec 31 23:00:00 EST 1975 · Soil Sci. Soc. Am. J.; (United States)

DOI:https://doi.org/10.2136/sssaj1976.03615995004000050033x· OSTI ID:7212800

Malzer, G L; Barber, S A

While chelates have been shown to increase the flux of metal cations into roots, the mechanism has been subject to question. The objective of this research was to characterize the action of chelates on metal cation absorption. Calcium and Sr rather than micronutrient metals were used because some plant roots do not discriminate in their absorption, hence, relative flux of Ca vs. Sr could be used to evaluate uptake mechanisms. The chelates used were: EDTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriaminepentaacetic acid), and HEDTA (hydroxyethylenediaminetriacetic acid). Flux into corn (Zea mays L.) roots was determined by monitoring Ca, Sr, and chelate depletion from solution with time. Double labeling of Ca and Sr with /sup 45/Ca and /sup 85/Sr was used. Ligand concentrations were measured using Cd titration, /sup 14/C-labeling, and UV-absorption measurements of Cu-ligand complexes. Calcium and Sr were removed from solution more rapidly than the chelate. Only 11 to 16 percent of the chelating ligand was absorbed over a 5-day period whereas 90 percent or more of each of Ca and Sr was absorbed. The Ca/Sr ratio of uptake indicated that some of the Ca and Sr was absorbed directly from the chelate. However, where Ca/sup 2 +/ was maintained by continual addition, chelated Ca appeared relatively unavailable to the plant.

• Research Organization: Purdue Univ., Lafayette, IN
• OSTI ID: 7212800
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 40:5; ISSN SSSJD
• 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 SPECTROSCOPY
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
AMINO ACIDS
ATOMIC IONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOMASS
CALCIUM
CALCIUM 45
CALCIUM IONS
CALCIUM ISOTOPES
CARBON 14
CARBON ISOTOPES
CARBOXYLIC ACIDS
CEREALS
CHARGED PARTICLES
CHELATES
CHELATING AGENTS
CHEMICAL REACTIONS
CHEMISORPTION
COMPLEXES
DAYS LIVING RADIOISOTOPES
DISPERSIONS
DOUBLE LABELLING
DRUGS
DTPA
EDTA
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ENERGY SOURCES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GRAMINEAE
GRASS
HEDTA
HOURS LIVING RADIOISOTOPES
HYDROXY ACIDS
INTERMEDIATE MASS NUCLEI
IONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LABELLING
LIGANDS
LIGHT NUCLEI
MAIZE
METALS
MIXTURES
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RADIOISOTOPES
RADIOPROTECTIVE SUBSTANCES
RENEWABLE ENERGY SOURCES
RESPONSE MODIFYING FACTORS
ROOT ABSORPTION
ROOTS
SEPARATION PROCESSES
SOLUTIONS
SORPTION
SPECTRA
SPECTROSCOPY
STRONTIUM
STRONTIUM 85
STRONTIUM ISOTOPES
TITRATION
ULTRAVIOLET SPECTRA
UPTAKE
YEARS LIVING RADIOISOTOPES