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Plant Growth-Promoting Nitrogen-Fixing Enterobacteria Are in Association with Sugarcane Plants Growing in Guangxi, China

文献类型： 外文期刊

作者： Lin, Li 2 ; Li, Zhengyi 4 ; Hu, Chunjin 2 ; Zhang, Xincheng 1 ; Chang, Siping 4 ; Yang, Litao 1 ; Li, Yangrui 1 ; An, Qia 1 ;

作者机构： 1.Guangxi Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Nanning 530004, Peoples R China

2.Guangxi Acad Agr Sci, Nanning 530007, Peoples R China

3.Chinese Acad Agr Sci, Sugarcane Res Ctr, Nanning 530007, Peoples R China

4.Zhejiang Univ, Inst Biotechnol, Hangzhou 310058, Zhejiang, Peoples R China

关键词： biological nitrogen fixation;enterobacteria;nifH;plant growth-promoting bacteria;sugarcane

期刊名称：MICROBES AND ENVIRONMENTS （ 影响因子：2.912； 五年影响因子：3.784 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The current nitrogen fertilization for sugarcane production in Guangxi, the major sugarcane-producing area in China, is very high. We aim to reduce nitrogen fertilization and improve sugarcane production in Guangxi with the help of indigenous sugarcane-associated nitrogen-fixing bacteria. We initially obtained 196 fast-growing bacterial isolates associated with the main sugarcane cultivar ROC22 plants in fields using a nitrogen-deficient minimal medium and screened out 43 nitrogen-fixing isolates. Analysis of 16S rRNA gene sequences revealed that 42 of the 43 nitrogen-fixing isolates were affiliated with the genera Enterobacter and Klebsiella. Most of the nitrogen-fixing enterobacteria possessed two other plant growth-promoting activities of IAA production, siderophore production and phosphate solubilization. Two Enterobacter spp. strains of NN145S and NN143E isolated from rhizosphere soil and surface-sterilized roots, respectively, of the same ROC22 plant were used to inoculate micropropagated sugarcane plantlets. Both strains increased the biomass and nitrogen content of the sugarcane seedlings grown with nitrogen fertilization equivalent to 180 kg urea ha-1, the recommended nitrogen fertilization for ROC22 cane crops at the seedling stage. 15N isotope dilution assays demonstrated that biological nitrogen fixation contributed to plant growth promotion. These results suggested that indigenous nitrogen-fixing enterobacteria have the potential to fix N2 associated with sugarcane plants grown in fields in Guangxi and to improve sugarcane production.

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