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journal1 ›› 2016, Vol. 32 ›› Issue (1): 129-134.DOI: 10.16409/j.cnki.2095-039x.2016.01.020

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Identification of PGPR Strain S160 on Cucumber and Its Adsorption for Lead Ions

QIN Shijiao1, LI Juan1, WANG Yuanhong1, KANG Fenfen2, LIU Ke1, FAN Le1, CHANG Ruokui3   

  1. 1. College of Horticulture, Tianjin Agriculture University, Tianjin 300384, China;
    2. Tianjin Entry-Exit Inspection and Quarantine Bureau, Tianjin 300461, China;
    3. College of Engineering and Technology, Tianjin Agriculture University, Tianjin 300384, China
  • Received:2015-03-18 Online:2016-02-08 Published:2016-02-22

Abstract: A bacterial isolate S160 from cucumber rhziosphere was obtained and screened for its ability to promote cucumber growth, control cucumber Fusarium oxysporum and absorb heavy metal Pb2+. Based on comparative analysis of 16S rDNA sequence, morphology and chemotaxonomic traits, strain S160 was identified as Serratia marcescens. By pot experiment, control efficiency against cucumber F. oxysporum was evaluated with 57.2%. Growth promotion assay in cucumber showed better promoting effect and root colonization capacity, with colonization quantity is about 7.20×103 CFU/g. Atomic absorption spectroscopy was used to measure the concentration of Pb2+ in the liquid medium after treated with strain S160. The concentration of Pb2+ decreased after treated with strain S160 and the adsorption rate of Pb2+ reached 47.63%. These results indicate that strain S160 share a certain capacity in controlling cucumber Fusarium wilt, promoting cucumber growth and remediation of heavy metal Pb2+.

Key words: PGPR, Serratia marcescens, Fusarium oxysporum, Pb2+

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