Influence of the arbuscular mycorrhizal fungus Glomus mosseae on uptake of arsenate by the As hyperaccumulator fern Pteris vittata L.
We report for the first time some effects of colonization by an arbuscular mycorrhizal (AM) fungus (Glomus mosseae) on the biomass and arsenate uptake of an As hyperaccumulator, Pteris vittata. Two arsenic levels (0 and 300 mg As kg−1) were applied to an already contaminated soil in pots with two compartments for plant and hyphal growth in a glasshouse experiment. Arsenic application had little or no effect on mycorrhizal colonization, which was about 50% of root length. Mycorrhizal colonization increased frond dry matter yield, lowered the root/frond weight ratio, and decreased frond As concentration by 33–38%. Nevertheless, transfer of As to fronds showed a 43% increase with mycorrhizal colonization at the higher soil As level. Frond As concentrations reached about 1.6 g kg−1 (dry matter basis) in non-mycorrhizal plants in the As-amended soil. Mycorrhizal colonization elevated root P concentration at both soil As levels and mycorrhizal plants had higher P/As ratios in both fronds and roots than did non-mycorrhizal controls.
KeywordsArsenic Arbuscular mycorrhiza Arsenic hyperaccumulator As resistance Phytoremediation
This work was funded by the Natural Science Foundation of China (Project 30370818), the National High Technology Research and Development Program (863 Program) of the Science Technology Department of the People’s Republic of China (Project 2001AA645010-4) and the Royal Society of London (Project 15360). The original seedlings were kindly supplied by Dr. Tongbin Chen of the Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences.
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