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油菜(甘蓝型油菜)根系重金属抗性内生细菌的表征及其对油菜生长和铅积累的促进潜力

Characterization of heavy metal-resistant endophytic bacteria from rape (Brassica napus) roots and their potential in promoting the growth and lead accumulation of rape.

作者信息

Sheng Xia-Fang, Xia Juan-Juan, Jiang Chun-Yu, He Lin-Yan, Qian Meng

机构信息

MOA Key Laboratory of Microbiological Engineering of Agricultural Environment, College of Life Science, Nanjing Agricultural University, Nanjing 210095, PR China.

出版信息

Environ Pollut. 2008 Dec;156(3):1164-70. doi: 10.1016/j.envpol.2008.04.007. Epub 2008 May 19.

Abstract

Two lead (Pb)-resistant endophytic bacteria were isolated from rape roots grown in heavy metal-contaminated soils and characterized. A pot experiment was conducted for investigating the capability of the two isolates to promote the growth and Pb uptake of rape from Pb-amended soil. The two isolates were identified as Pseudomonas fluorescens G10 and Microbacterium sp. G16 based on the 16S rDNA gene sequence analysis. Strains G10 and G16 exhibited different multiple heavy metal and antibiotic resistance characteristics and increased water-soluble Pb in solution and in Pb-added soil. Root elongation assays demonstrated increases in root elongation of inoculated rape seedlings compared to the control plants. Strain G16 produced indole acetic acid, siderophores and 1-aminocyclopropane-1-carboxylate deaminase. Increases in biomass production and total Pb uptake in the bacteria-inoculated plants were obtained compared to the control. The two strains could colonize the root interior and rhizosphere soil of rape after root inoculation.

摘要

从生长在重金属污染土壤中的油菜根部分离并鉴定出两株抗铅内生细菌。进行了盆栽试验,以研究这两株分离菌促进油菜从添加铅的土壤中生长和吸收铅的能力。基于16S rDNA基因序列分析,这两株分离菌被鉴定为荧光假单胞菌G10和微杆菌属G16。菌株G10和G16表现出不同的多种重金属和抗生素抗性特征,并增加了溶液和添加铅土壤中的水溶性铅。根伸长试验表明,与对照植株相比,接种油菜幼苗的根伸长增加。菌株G16产生吲哚乙酸、铁载体和1-氨基环丙烷-1-羧酸脱氨酶。与对照相比,接种细菌的植株生物量产量和总铅吸收量增加。根接种后,这两个菌株可以定殖在油菜的根内部和根际土壤中。

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