Folia Microbiologica

, Volume 29, Issue 2, pp 148–155 | Cite as

Mineralization of 2,4-dichlorophenoxyacetic acid in soil simultaneously enriched with saccharides

  • F. Kunc
  • J. Rybářová
  • J. Lasík


Detoxication of 2,4-dichlorophenoxyacetic acid (2,4-D) in samples of chernozem soil was determined by a biological test and the time course of production of14CO2 a product of microbial degradation of 2-14C-2,4-D, was measured during 38-d incubation at 28°C in the dark. Enrichment of the soil with glucose (1000 ppm), two exocellular bacterial glucan and glucomannan polysaccharides (750 ppm), or a mixture of glucose with (NH4)2SO4 (C:N=5∶1) brought about acceleration of both detoxication and mineralization of 2,4-D (50 ppm) added simultaneously with the saccharides. Mineralization of the saccharides always preceded the degradation of the herbicide. The lag phase of 2,4-D mineralization, did not exceed 3 d. In samples with saccharides the doubling time of the mineralization activity in the exponential phase of the process was substantially shortened and the mineralization of 2,4-D was accelerated even when the soil was inoculated with a suspension of soil in which microbial 2,4-D decomposers had accumulated. The extent, of mineralization was not affected by the presence of saccharides (about 1/3 of the introduced radioactive carbon was transformed into14CO2). All saccharides had a similar effect which reflected an increase in the overall bacterial count and in the relative abundance of bacterial 2,4-D decomposers. The role of other mechanisms such as co-metabolism in the stimulation of the degradation process is discussed.


MCPA Picloram Dicamba Chernozem Soil Microbial Degradation 
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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic 1984

Authors and Affiliations

  • F. Kunc
    • 1
  • J. Rybářová
    • 1
  • J. Lasík
    • 1
  1. 1.Department of Microbial Ecology, Institute of MicrobiologyCzechoslovak Academy of SciencesPrague 4

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