Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 19, Pages 8756-8761Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.07.064
Keywords
Pteris vittata; Rhizosphere; Fluorescent bacteria; As solubilization; Plant growth promotion
Funding
- UF-IFAS
Ask authors/readers for more resources
The role of arsenic-resistant bacteria (ARB) in arsenic solubilization from growth media and growth enhancement of arsenic-hyperaccumulator Pteris vittata L. was examined. Seven ARB (tolerant to 10 mM arsenate) were isolated from the P. vittata rhizosphere and identified by 16S rRNA sequencing as Pseudomonas sp., Comamonas sp. and Stenotrophomonas sp. During 7-d hydroponic experiments, these bacteria effectively solubilized arsenic from the growth media spiked with insoluble FeAsO4 and AlAsO4 minerals (from <5 mu g L-1 to 5.04-7.37 mg L-1 As) and enhanced plant arsenic uptake (from 18.1-21.9 to 35.3-236 mg kg(-1) As in the fronds). Production of (1) pyochelin-type siderophores by ARB (fluorescent under ultraviolet illumination and characterized with thin layer chromatography) and (2) root exudate (dissolved organic C) by P. vittata may be responsible for As solubilization. Increase in P. vittata root biomass from 1.5-2.2 to 3.4-4.2 g/plant dw by ARB and by arsenic was associated with arsenic-induced plant P uptake. Arsenic resistant bacteria may have potential to enhance phytoremediation of arsenic-contaminated soils by P. vittata. Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available