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Biodegradation of Di-n-butyl phthalate in rhizosphere and growth-promoting effect of Cucumis sativus Linn. by a novel Pseudomonas sp. DNB-S1.

Authors
  • Li, Shuqin1
  • Wang, Lei1
  • Li, Ying1
  • Huang, Fuxin1
  • Yu, Hui1
  • Zhang, Ying2
  • Li, Rui1
  • Chen, Zhaobo3
  • Wei, Ningrui1
  • Yu, Zhengzhe1
  • 1 School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, China. , (China)
  • 2 School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, China. [email protected] , (China)
  • 3 College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian, 116600, China. , (China)
Type
Published Article
Journal
Ecotoxicology (London, England)
Publication Date
Sep 01, 2021
Volume
30
Issue
7
Pages
1454–1464
Identifiers
DOI: 10.1007/s10646-020-02287-0
PMID: 33094413
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Plant associated-bacteria can facilitate the host plant in overcoming contaminant-induced stress responses as well as improve plant development and growth. In this study, a successful approach was reported to reduce the Dibutyl phthalate (DBP) levels of polluted soil and, consequently, to improve cucumber growth. DBP suppressed development of cucumber seedings significantly, damage sub-cellular of root, especially the biomembrane system, and affected the microbial community structures of the soil. When DBP was applied at a concentration of 5 mg/kg to cucumber seedlings inoculated with degrading strain DNB-S1, the DBP residue in roots was very low. When the cucumber plants were exposed to DBP stress over 20 and 40 mg/kg DBP, the DBP residues in the roots inoculated with degrading strain DNB-S1 were reduced by 36.5% and 40.42% respectively, compared with the non-inoculation group. Moreover, DBP dissipation in rhizosphere soil is accelerated through inoculation with DNB-S1 which could effectively relieve the pressure of DBP stress on plant. The dry weight of cucumber roots inoculated with DBP-degrading bacterium was higher than that of non-inoculated seedlings. According to ultrastructural micrographs, the DBP-degrading bacteria could considerably alleviate the damaging effect of DBP on cucumber root cell organs. The application of strain DNB-S1 could efficiently alleviated the stress of DBP on the microbial community structure. © 2020. Springer Science+Business Media, LLC, part of Springer Nature.

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