A nonpathogenic Fusarium oxysporum strain enhances phytoextraction of heavy metals by the hyperaccumulator Sedum alfredii Hance.

Low biomass and shallow root systems limit the application of heavy metal phytoextraction by hyperaccumulators. Plant growth-promoting microbes may enhance hyperaccumulators'phytoextraction. A heavy metal-resistant fungus belonged to the Fusarium oxysporum complex was isolated from the Zn/Cd co-hyperaccumulator Sedum alfredii Hance grown in a Pb/Zn mined area. This Fusarium fungus was not pathogenic to plants but promoted host growth. Hydroponic experiments showed that 500 μM Zn(2+) or 50 μM Cd(2+) combined with the fungus increased root length, branches, and surface areas, enhanced nutrient uptake and chlorophyll synthesis, leading to more vigorous hyperaccumulators with greater root systems. Soil experiments showed that the fungus increased root and shoot biomass and S. alfredii-mediated heavy metal availabilities, uptake, translocation or concentrations, and thus increased phytoextraction of Zn (144% and 44%), Cd (139% and 55%), Pb (84% and 85%) and Cu (63% and 77%) from the original Pb/Zn mined soil and a multi-metal contaminated paddy soil. Together, the nonpathogenic Fusarium fungus was able to increase S. alfredii root systems and function, metal availability and accumulation, plant biomass, and thus phytoextraction efficiency. This study showed a great application potential for culturable indigenous fungi other than symbiotic mycorrhizas to enhance the phytoextraction by hyperaccumulators.

Zhang X ，Lin L ，Chen M ，Zhu Z ，Yang W ，Chen B ，Yang X ，An Q ... -  《-》

Colonization and modulation of host growth and metal uptake by endophytic bacteria of Sedum alfredii.

Zhang X ，Lin L ，Zhu Z ，Yang X ，Wang Y ，An Q ... -  《INTERNATIONAL JOURNAL OF PHYTOREMEDIATION》

Comparison of synthetic chelators and low molecular weight organic acids in enhancing phytoextraction of heavy metals by two ecotypes of Sedum alfredii Hance.

Liu D ，Islam E ，Li T ，Yang X ，Jin X ，Mahmood Q ... -  《JOURNAL OF HAZARDOUS MATERIALS》

The role of bacteria in the heavy metals removal and growth of Sedum alfredii Hance in an aqueous medium.

Xiong J ，He Z ，Liu D ，Mahmood Q ，Yang X ... -  《CHEMOSPHERE》

Phytoextraction of metals and rhizoremediation of PAHs in co-contaminated soil by co-planting of Sedum alfredii with ryegrass (Lolium perenne) or castor (Ricinus communis).

Wang K ，Huang H ，Zhu Z ，Li T ，He Z ，Yang X ，Alva A ... -  《INTERNATIONAL JOURNAL OF PHYTOREMEDIATION》