title: Effects of plant growth-promoting bacteria isolated from copper tailings on plants in sterilized and non-sterilized tailings.
abstract: Ten strains of Cu-tolerant bacteria with potential plant growth-promoting ability were isolated by selecting strains with the ability to use 1-aminocyclopropane-1-carboxylate as a sole nitrogen source (designated ACC-B) or fix nitrogen (designated FLN-B) originating from the rhizosphere of plants growing on copper tailings. All 10 strains proved to have intrinsic ability to produce indole acetic acid and siderophores, and most of them could mobilize insoluble phosphate. In addition, a greenhouse study showed that ACC-B, FLN-B and a mixture of both had similar, potent ability to stimulate growth of Pennisetum purpureum, Medicago sativa and Oenothera erythrosepala plants grown on sterilized tailings. For instance, above-ground biomass of P. purpureum was 278-357% greater after 60d growth on sterilized tailings in their presence. They could also significantly promote the growth of the plants grown on non-sterilized tailings, though the growth-promoting effects were much weaker. So, strategies for using of the plant growth-promoting bacteria in the practice of phytoremediation deserve further studies to get higher growth-promoting efficiency.
authors.affiliation: Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: lsslwq@mail.sysu.edu.cn.
authors.forename: Weiqiu
authors.initials: W
authors.lastname: Liu
authors.affiliation: Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: 330862941@qq.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Yang
authors.affiliation: College of Life Science & Technology, Southwest University for Nationalities, Chengdu 610041, China. Electronic address: 936079637@qq.com.
authors.forename: Si
authors.initials: S
authors.lastname: Shi
authors.affiliation: Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: shuws@mail.sysu.edu.cn.
authors.forename: Wensheng
authors.initials: W
authors.lastname: Shu
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D018533:Biomass; D003300:Copper / Q000633:toxicity*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007210:Indoleacetic Acids / Q000378:metabolism; D008906:Mining; D009584:Nitrogen / Q000378:metabolism; D063245:Plant Development / Q000502:physiology; D010944:Plants / Q000187:drug effects / Q000382:microbiology; D058441:Rhizosphere; D017262:Siderophores / Q000378:metabolism; D012988:Soil Microbiology; D013242:Sterilization
chemical_list: D007210:Indoleacetic Acids; D017262:Siderophores; C030737:indoleacetic acid; D003300:Copper; D009584:Nitrogen
keywords: Copper; Mine tailings; Phytostabilization; Plant growth-promoting bacteria (PGPB)