Journal article
Cyanide production by rhizobacteria as a possible mechanism of plant growth inhibition
Biology and Fertility of Soils, Vol.7(3), pp.232-238
1989
Abstract
Volatile metabolites from a number of rhizosphere pseudomonads prevented lettuce root growth in a seedling bioassay. One of these metabolites was identified as cyanide. Direct contact between rhizobacteria and plant roots produced, with one exception, similar responses. However, not all cyanogenic isolates were plant-growth-inhibitory rhizobacteria. When grown in liquid culture, cyanogenic strains produced an average of 37 nmol HCN ml-1 over a 36-h period and inhibition of root growth occurred at concentrations as low as 20 nmol ml-1. Cyanogenic strains introduced into sand or soil also produced HCN. Two cyanogenic strains of Pseudomonas fluorescens, one (5241) a plant-growth inhibitory rhizobacterium and the other (S97) a plant-growth-promotory rhizobacterium, were used to treat bean and lettuce seedlings prior to planting in soil. Lettuce dry weight was reduced by 49.2% (day 28) and 37.4% (day 49) when inoculated with S241 whereas S97 increased growth initially (+64.5% at day 28, no difference from control at day 49). Equivalent figures for inoculated bean plants were: -52.9% and -65.1% (5241); +40.7% and +23.3% (S97). A more detailed experiment using only bean plants confirmed these contrasting affects. Inhibition by S241 was related to consistently higher levels of rhizosphere cyanide in comparison with S97-treated plants and control soils. S241 also survived in the rhizosphere at higher densities and for a longer period of time than S97. The possible contribution of rhizobacterial cyanogenesis to plant growth inhibition is discussed. © 1989 Springer-Verlag.
Details
- Title
- Cyanide production by rhizobacteria as a possible mechanism of plant growth inhibition
- Authors
- S Alström (Author) - Swedish University of Agricultural Sciences, SwedenRichard G Burns (Author) - University of Kent, United Kingdom
- Publication details
- Biology and Fertility of Soils, Vol.7(3), pp.232-238
- Publisher
- Springer
- Date published
- 1989
- DOI
- 10.1007/BF00709654
- ISSN
- 0178-2762
- Organisation Unit
- University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
- Language
- English
- Record Identifier
- 99449122002621
- Output Type
- Journal article
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Source: InCites