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Applied and Environmental Microbiology, October 1998, p. 3663-3668, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

A Plant Growth-Promoting Bacterium That Decreases Nickel Toxicity in Seedlings

Genrich I. Burd, D. George Dixon, and Bernard R. Glick*

Department of Biology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

Received 1 December 1997/Accepted 28 July 1998

A plant growth-promoting bacterium, Kluyvera ascorbata SUD165, that contained high levels of heavy metals was isolated from soil collected near Sudbury, Ontario, Canada. The bacterium was resistant to the toxic effects of Ni2+, Pb2+, Zn2+, and CrO4-, produced a siderophore(s), and displayed 1-aminocyclopropane-1-carboxylic acid deaminase activity. Canola seeds inoculated with this bacterium and then grown under gnotobiotic conditions in the presence of high concentrations of nickel chloride were partially protected against nickel toxicity. In addition, protection by the bacterium against nickel toxicity was evident in pot experiments with canola and tomato seeds. The presence of K. ascorbata SUD165 had no measurable influence on the amount of nickel accumulated per milligram (dry weight) of either roots or shoots of canola plants. Therefore, the bacterial plant growth-promoting effect in the presence of nickel was probably not attributable to the reduction of nickel uptake by seedlings. Rather, it may reflect the ability of the bacterium to lower the level of stress ethylene induced by the nickel.

* Corresponding author. Mailing address: Department of Biology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1. Phone: (519) 888-4567 ext. 2058. Fax: (519) 746-0614. E-mail: glick{at}sciborg.uwaterloo.ca.

Applied and Environmental Microbiology, October 1998, p. 3663-3668, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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