Interaction of Collimonas strain IS343 with Rhizoctonia solani at low carbon availability in vitro and in soil

I.V. Senechkin, L.S. van Overbeek, H.L. Er, O.J. de Vos, A.H.C. van Bruggen

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Collimonas sp. IS343, isolated from an organically-farmed arable soil and characterized as a broad-range oligotrophic bacterium, was shown to degrade chitin and to suppress R. solani mycelium growth under in vitro conditions at high and low carbon availabilities. In contrast to C. fungivorans Ter331, strain IS343 did not respond with an increase in growth rate to higher carbon levels in liquid medium, it reached higher cell numbers in carbon-poor media and it showed better survival in bulk soil. Therefore, it was concluded that strain IS343 cells are better adapted to circumstances of low carbon availability as present in bulk soils than strain Ter331 cells. Further, strain IS343 cells were more suppressive towards R. solani than strain Ter331 cells in vitro. When introduced into soil, strain IS343 cells delayed disease development caused by R. solani AG2-2IIIB in sugar beet plants. These results suggest that strain IS343 cells are able to tentatively suppress R. solani AG2-2IIIB mycelium growth in soil. Potential mechanisms behind the observed suppressive effects can be competition for available nutrients between strain IS343 cells and R. solani mycelium in soil or the production of chitinase as shown for this and other Collimonas species
Original languageEnglish
Pages (from-to)789-802
JournalEuropean Journal of Plant Pathology
Issue number4
Publication statusPublished - 2013


  • organic farming systems
  • wave-like distributions
  • bacterial-populations
  • pythium-ultimum
  • wheat roots
  • pseudomonas-fluorescens
  • microbial-populations
  • oligotrophic bacteria
  • conventional soils
  • disease management

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