多粘类芽孢杆菌对油菜中锶富集和转移的影响

doi:10.3969/j.issn.1004-616x.2018.01.011

Abstract

Abstract: OBJECTIVE: This paper was to study on the effects of rhizosphere growth promoting bacteria Paenibacillus polymyxa on strontium enrichment in rape. From the aspect of food safety assessment,it was of practical significance to explore the characteristics of enrichment and transfer of typical radionuclide strontium in vegetables. It also provided a theoretical basis for the feasibility of phytoremediation of contaminated soil. METHODS: The experiment was divided into 5 groups:4 different strontium concentration treatment groups and 1 control groups (hydroponics blank control). The vegetable was cultivated by hydroponic method and Paenibacillus polymyxa was added. Vegetables were harvested at 3 time points (7 d,14 d,21 d) after adding Paenibacillus polymyxa to the hydroponic solution. Then the concentration of strontium in roots,stems and leaves of rape was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) and the concentration ratios and transportation factors were calculated. RESULTS: Compared with blank control groups,when Paenibacillus polymyxa was present,strontium concentrations in the stems,leaves and roots of rape increased with strontium concentration in hydroponic solution and increased with the number of cultivation days (P < 0.05) (except rape roots of 1 mmol/L strontium concentration in hydroponic solution with 21 d). The content of strontium in stems and leaves of rape was greater than that in rape roots (P < 0.05). Paenibacillus polymyxa led to reduction of the concentration ratios of strontium but to increase of the transportation factors which promoted the transfer of strontium from root to stem and leaf. TF(transportation factor) of strontium increased in experiment groups 1,2,3 and 4,with increased number of days to reach the highest in 21 days. CONCLUSION: Paenibacillus polymyxa significantly affected the transfer of strontium in rape. It reduced the concentration ratios of strontium in roots,stems and leaves of rape,and promoted the strontium transfer from root to stem and leaf.

Key words: Paenibacillus polymyxa, vegetables, strontium, enrichment, transfer

CLC Number:

R947.9

JIANG Xiaoyan, LI Yifeng, YAN Dong, HE Yingxue, DING Kuke. Effect of Paenibacillus polymyxa on strontium enrichment in rape[J]. Carcinogenesis, Teratogenesis & Mutagenesis, 2018, 30(1): 58-61.

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Effect of Paenibacillus polymyxa on strontium enrichment in rape

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