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| Effect of plant growth promoting rhizobacteria Enterobacter sp.EG16 on the growth and Selenium uptake of Brassica chinensis L. |
| Received:October 21, 2020 |
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| KeyWord:plant growth-prompting rhizobacteria（PGPR）;selenium （Se）;Brassica chinensis L.;biofortification;bioconcentration |
| Author Name | Affiliation | E-mail | | LIU Dongyun | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Guangdong Provincial Key Lab for Environmental Pollution Control and Remediation Technology, Guangzhou 510006, China | | | YUAN Yongqiang | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China | yuanyq7@mail.sysu.edu.cn | | QIU Rongliang | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Guangdong Provincial Key Lab for Environmental Pollution Control and Remediation Technology, Guangzhou 510006, China
Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China
Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China | | | WANG Shizhong | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Guangdong Provincial Key Lab for Environmental Pollution Control and Remediation Technology, Guangzhou 510006, China
Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China | wshizh2@mail.sysu.edu.cn | | HUANG Xiongfei | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China | | | HUANG Haiyan | Henan Runyou Forest Technical Service Company, Zhengzhou 450008, China | |
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| Abstract: |
| To study the interactions between selenium（Se）and plant growth-prompting rhizobacteria（PGPR）on plants, batch hydroponic experiments were conducted to analyze the interactions of exogenous Se and the inoculation with Enterobacter sp.EG16, a type of PGPR, on growth, physiological metabolism, and Se content of Brassica chinensis L. Results showed that lower Se concentrations were beneficial to the growth of Brassica chinensis L. whereas higher Se concentrations had negative effect whether or not the EG16 was applied. The threshold concentration of Se before it became toxic ranged from 5 to 10 mg·L-1. With the increase in the concentration of Se, the content of protein and malondialdehyde（MDA）increased, whereas the activities of catalase（CAT）enzymes increased at first and then decreased. The treatments in which plants were inoculated with EG16 solely increased the biomass, root volume, and the number of root branches but reduced MDA content significantly. At lower concentrations of Se（≤5 mg·L-1）, inoculation with EG16 not only increased the number of leaves, root volume, and number of root branches but also promoted root elongation. EG16 promoted the transfer of Se from underground to above ground. At higher concentrations（≥10 mg·L-1）of Se, although the Se concentrations both above ground and underground increased significantly, the growth of the plants was significantly inhibited, and the survival rate declined. However, the plants inoculated with EG16 had high peroxidase（POD）activity and high survival rate, which indicated that their resistance ability might be enhanced. The results show that EG16 not only promote the growth and Se accumulation in Brassica chinensis L., but also improve the stress resistance of plants at higher concentrations of Se. |
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