Effects of inoculation of a plant growth promoting rhizobacterium <Emphasis Type="Italic">Burkholderia</Emphasis> sp. D54 on plant growth and metal uptake by a hyperaccumulator <Emphasis Type="Italic">Sedum alfredii</Emphasis> Hance grown on multiple metal contaminated soil |
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Authors: | Junkang Guo Shirong Tang Xuehai Ju Yongzhen Ding Shangqiang Liao Ningning Song |
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Institution: | (1) Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, People’s Republic of China;(2) Open Key Laboratory of Agro-environment and Food Safety of Ministry of Agriculture, Tianjin, People’s Republic of China; |
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Abstract: | Batch experiments were designed to characterize a multiple metal resistant bacterium Burkholderia sp. D54 isolated from metal contaminated soils in the Dabaoshan Mine in South China, and a follow-up experiment was conducted
to investigate the effects of inoculating the isolate on plant growth and metal uptake by Sedum alfredii Hance grown on soils collected from a heavily contaminated paddy field in Daxing County, Guangxi Zhuang Automounous Region,
Southwest China. Our experiments showed that strain D54 produced indole acetic acid (IAA), siderophores, 1-aminocyclopropane-1-carboxylate
(ACC) deaminase, and solubilizing inorganic phosphate and solubilized insoluble metal bearing minerals. Bacterial inoculation
significantly enhanced S. alfredii biomass production, and increased both shoot and root Cd concentration, but induced little variation in root/shoot Pb concentration
and shoot Zn concentration. Despite this, the total shoot and root uptake of Cd, Pb and Zn in S. alfredii inoculated with D54 increased greatly compared to the non-inoculated controls. It was concluded that inoculation with strain
D54 could help S. alfredii grow better on metal contaminated soils, produce more biomass, and remove more metals from soil, which implies improved efficiency
of phytoextraction from metal contaminated soil. The knowledge gained from the present experiments constitutes an important
advancement in understanding of the interaction between plant growth-promoting bacteria and hyperaccumulators with regard
to plant ability to grow and remove the multiple heavy metals from soils. |
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