Behaviour of bacterial populations isolated from rhizosphere of Diplachne fusca dominant in industrial sites

R. A. Abou-Shanab, H. Ghozlan, K. Ghanem, H. Moawad

Research output: Contribution to journalReview articlepeer-review

30 Scopus citations

Abstract

A total of 107 bacterial strains were isolated from rhizosphere soil of Diplachne fusca naturally grown in industrial metal-contaminated soils. All the isolates were examined for their ability to tolerate Cd2+, Cr 3+, Co2+, Cu2+, Pb2+, Ni 2+ and Zn2+ in their growth medium, in addition, three related phenotypic characters, the ability to produce acids and siderophores and/or calcium phosphate solubilization, were tested. The resistance patterns, expressed as MICs, for all bacterial isolates to seven different metal ions were surveyed by using the agar dilution method. A great proportion of the isolates were resistant to Cr (99%), Pb (93%), Cu (87%) and Zn (86%). On the other hand, 77, 49 and 45% were sensitive to Co, Ni and Cd, respectively. The majority of the strains tested (98%) were multiple metal-resistant, with hexametal resistance as the major pattern (24.2%). The increase in metal ion uptake (especially Cr, Pb, Zn and Ni) by D. fusca was correlated with higher numbers of siderophore-producing, phosphate-solubilizing and acid-producing bacteria 95, 81 and 64%, respectively.

Original languageEnglish (US)
Pages (from-to)1095-1101
Number of pages7
JournalWorld Journal of Microbiology and Biotechnology
Volume21
Issue number6-7
DOIs
StatePublished - Oct 1 2005

Keywords

  • Heavy metals
  • Industrial site
  • Metal-tolerant bacteria
  • Rhizosphere

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