Effects of host plant exposure to cadmium on mycorrhizal infection and soluble carbohydrate levels of Pinus sylvestris seedlings

In a Cd-contaminated environment, not only mature trees but also their seeds and young seedlings can be exposed to Cd. Cadmium taken up by young seedlings may influence mycorrhizal infection, which might in turn influence resistance to Cd toxicity. In order to eliminate soil-mediated responses of my...

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Bibliographic Details
Published in:Environmental pollution (1987) 2004-09, Vol.131 (2), p.287-294
Main Authors: Kim, C.-G., Power, S.A., Bell, J.N.B.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Biomass
Cadmium - toxicity
Cadmium pretreatment
Carbohydrates - analysis
Ecotoxicology, biological effects of pollution
Ectomycorrhizas
Fundamental and applied biological sciences. Psychology
Growth
Mycorrhizae - drug effects
Paxillus involutus
Pinus sylvestris
Pinus sylvestris - drug effects
Pinus sylvestris - growth & development
Pinus sylvestris - microbiology
Plant Roots - metabolism
Rhizopogon subcaerulescens
Seedlings - drug effects
Seedlings - growth & development
Soil Pollutants - toxicity
Soluble carbohydrates
Suillus bovinus
Terrestrial environment, soil, air
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Summary:In a Cd-contaminated environment, not only mature trees but also their seeds and young seedlings can be exposed to Cd. Cadmium taken up by young seedlings may influence mycorrhizal infection, which might in turn influence resistance to Cd toxicity. In order to eliminate soil-mediated responses of mycorrhizal infection to Cd, Pinus sylvestris seedlings were exposed to Cd prior to fungal inoculation and replanted to clean substrates with fungal inoculum. Cadmium pretreatment reduced the proportion of living mycorrhizal short roots of seedlings inoculated with Paxillus involutus. However, no such effect was observed for seedlings inoculated with Suillus bovinus and Rhizopogon subcaerulescens. Therefore, infection by P. involutus appeared to be affected by Cd taken up by seedlings. Overall stem length and biomass of the seedlings were reduced by Cd pretreatment. Infection by S. bovinus and R. subcaerulescens increased stem length and biomass of the seedlings. Root soluble carbohydrate concentrations were lower in mycorrhizal seedlings than non-mycorrhizal seedlings.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2004.02.015