Potential contribution of arbuscular mycorrhiza to cadmium immobilisation in soil

0091116 - BÚ 2008 RIV GB eng J - Journal Article
Janoušková, Martina - Pavlíková, D. - Vosátka, Miroslav
Potential contribution of arbuscular mycorrhiza to cadmium immobilisation in soil.
[Potenciální příspěvek arbuskulární mykorhizy k imobilizaci kadmia v půdě.]
Chemosphere. Roč. 65, č. 11 (2006), s. 1959-1965. ISSN 0045-6535. E-ISSN 1879-1298
R&D Projects: GA ČR GA526/02/0293; GA AV ČR KSK6005114
Institutional research plan: CEZ:AV0Z60050516
Keywords : extraradical mycelium * heavy metals * rhizosphere
Subject RIV: EF - Botanics
Impact factor: 2.442, year: 2006

The contribution of arbuscular mycorrhiza, (AM) to immobilisation of Cd in substrate was studied in two experiments. In the first experiment, substrates prepared by cultivating tobacco, either non-mycorrhizal or inoculated with the AM fungus Glomus intraradices were enriched with a range of Cd concentrations, and Cd toxicity in the substrates was assessed using root growth tests with lettuce as a test plant. The tests revealed lower Cd toxicity in the mycorrhizal than in the non-mycorrhizal substrate, and the difference increased with increasing total Cd concentration in the substrates. In the second experiment, extraradical mycelium (ERM) of G. intraradices exposed in vivo to Cd was collected and analysed on Cd concentration. The ERM accumulated 10-20 times more Cd per unit of biomass than tobacco roots. While Cd concentrations were lower in the biomass of mycorrhizal plants than of non-mycorrhizal plants, Cd immobilisation by ERM did not affect the total Cd content in mycorrhizal tobacco. It is concluded that mycorrhiza may decrease Cd toxicity to plants by enhancing Cd immobilisation in soil. The results therefore suggest a potential role of AM symbiosis in the phytostabilisation of contaminated soils, where high Cd availability inhibits plant growth.

Byla zjištěna nižší toxicita kadmia v rhizosféře mykorhizního tabáku než v rhizosféře nemykorhizního tabáku a rozdíl se zvětšoval s rostoucí koncentrací kadmia v půdě. Extraradikální mycélium houby Glomus intraradices akumulovalo 10 až 20 krát více kadmia na jednotku biomasy než kořeny tabáku. Imobilizace kadmia v mycéliu však nesnížila celkový příjem kadmia tabákem. Závěrem lze říci, že mykorhiza může snížit toxicitu kadmia pro rostliny zvýšením imobilizace kadmia v půdě.
Permanent Link: http://hdl.handle.net/11104/0151791