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

doi:10.16409/j.cnki.2095-039x.2016.01.020

Abstract

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⁺

CLC Number:

S476

QIN Shijiao, LI Juan, WANG Yuanhong, KANG Fenfen, LIU Ke, FAN Le, CHANG Ruokui. Identification of PGPR Strain S160 on Cucumber and Its Adsorption for Lead Ions[J]. journal1, 2016, 32(1): 129-134.

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