Effects of arbuscular mycorrhizal inoculation on cadmium accumulation by different tobacco ( Nicotiana tabacum L.) types

• Published in: Applied soil ecology : a section of Agriculture, ecosystems & environment ecosystems & environment, 2007-03, Vol.35 (3), p.502-510
• Main Authors: Janoušková, M., Vosátka, M., Rossi, L., Lugon-Moulin, N.
• Format: Article
• Language: English
• Subjects: Agriculture; Agronomy. Soil science and plant productions; bioaccumulation; Biological and medical sciences; cadmium; chemical constituents of plants; Chemical, physicochemical, biochemical and biological properties; Economic plant physiology; Fundamental and applied biological sciences. Psychology; Glomus; Heavy metals; leaves; microbial colonization; Nicotiana tabacum; Nitrogen; nutrient uptake; Phosphorus; Physics, chemistry, biochemistry and biology of agricultural and forest soils; potassium; roots; Soil and water pollution; soil chemical properties; soil inoculation; Soil science; Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...); tobacco; uptake mechanisms; varieties; vesicular arbuscular mycorrhizae
• ISSN: 0929-1393; 1873-0272
• DOI: 10.1016/j.apsoil.2006.10.002

The effect of arbuscular mycorrhiza (AM) on cadmium (Cd) uptake by tobacco ( Nicotiana tabacum L.) was studied in a pot experiment. Three commercial varieties, Basma BEK, K326 and TN90, representing three distinct tobacco types, were each grown in a different soil with nutritional conditions matching as closely as possible their requirements for field production. Cd concentrations in these soils were within the background range. Each variety was either non-mycorrhizal or inoculated with one of five AM fungal isolates. Cd concentration in leaves was decreased by inoculation with selected isolates in the K326 and TN90 variety grown in acidic soils. In contrast, it was increased by inoculation with most isolates in the Basma BEK variety grown in a basic soil with low Cd availability. Besides, plants of all three varieties had significantly higher leaf concentrations of phosphorus and nitrogen in some inoculated treatments. The percentage of root colonisation was mostly low in the inoculated treatments. In the Basma BEK and TN90 variety, the tested AM fungal isolates differed in their ability to colonise roots, but no correlation was found between the root colonisation of an isolate and its effects on the Cd concentrations in tobacco leaves. One isolate influenced most pronouncedly Cd concentrations and improved mineral nutrition in all the three combinations of variety and soil despite its low colonisation levels. AM symbiosis probably affected Cd uptake of tobacco by indirect mechanisms such as stimulation of root growth or mycorrhizal plant mediated changes in chemical or biological soil properties.