Influence of binary interactions of arsenate, molybdate, and selenate on yield and composition of alfalfa. [Medicago sativa L]

• Published in: Journal of environmental quality Vol. 18:3
• Main Authors: Khattak, R.A., Haghnia, G.H., Mikkelsen, R.L., Page, A.L., Bradford, G.R.
• Format: Journal Article
• Language: English
• Published: United States
• Subjects: 540220 > Environment, Terrestrial > Chemicals Monitoring & Transport > (1990-); ALFALFA; ANIONS; ARSENIC COMPOUNDS; CHARGED PARTICLES; CHEMICAL REACTION KINETICS; ENVIRONMENTAL SCIENCES; GROWTH; IONS; KINETICS; LEGUMINOSAE; MAGNOLIOPHYTA; MAGNOLIOPSIDA; MOLYBDENUM COMPOUNDS; PLANT GROWTH; PLANTS; RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT; REACTION KINETICS; REFRACTORY METAL COMPOUNDS; SELENIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS 560300 > Chemicals Metabolism & Toxicology; UPTAKE
• ISSN: 0047-2425; 1537-2537

To evaluate the effects of binary interactions (As(V) {times} Se(VI), Se(VI) {times} Mo(VI) and As(V) {times} Mo(VI)) on growth and composition of alfalfa (Medicago sativa L.), three glasshouse sand culture experiments were conducted. Added Mo(VI) concentrations in the nutrient solutions had no significant effect on the tissue yield of alfalfa. Arsenic showed some adverse effect on shoot and root yield. The highest Se(VI) treatment decreased alfalfa shoot and root yield. The tissue As, Se, and Mo concentrations increased correspondingly with the increased solution concentrations. At equal levels in the solution, alfalfa accumulated Se > Mo >> As. Increasing As(V) in solution caused significant increases in shoot Se concentrations and uptake, whereas solution Se(VI) showed a strong antagonistic effect on As uptake. The Se treatments significantly increase Mo concentrations and uptake by shoot and root at all levels of solution Mo, except 0.01 mg L{sup {minus}1} where 1.0 mg Se L{sup {minus}1} increased Mo concentration, but had no significant effect on Mo uptake. Increasing Mo levels in the nutrient solution showed no significant effect on Se concentration and uptake by root. However, at 1.0 mg Se(VI) L{sup {minus}1}, shoot Se concentration increased significant increased significantly at 3.0 and 5.0 mg Mo L{sup {minus}1}. The solution As(V) showed no significant effect on tissue Mo at 0.01 and 1.0 mg Mo(VI) L{sup {minus}1} but increased Mo concentrations in shoot significantly at 3.0 and 5.0 mg Mo(VI) L{sup {minus}1}.