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Distant interactions (DI) between two populations of bacterium P.fluorescens separated by glass in the device "flask-in-flask" [1,2] have been investigated. DI significantly influenced adhesive capacities of cells. Without air exchange between cultures amount of non-adhered cells increased on 30-50% due to influence of the other neighbored culture. It was a "pure effect" of DI. Amount of non-adhered cells also increased (on 10-30%) under the influence of air from growing culture (i.e. without DI). This effect was caused by non-identified volatile antiadhesive compound (VAA). When DI and VAA acted simultaneously the amount of non-adhered cells increased 2-30-fold (9-fold in the avarage). This fact indicates the reciprocal intensification of their action.

It is known from few literature data that DI can effect growth of bacteria [1,2], their adaptation to stress and spores germination [2,3]. Influence of DI on bacterial adhesion has not been described. It is worth to stress that many authors working with bacteria and eukaryotes knew about the presence of chemical regulators as well as about DI. Meanwhile the synergism of the DI and of chemical regulators has never been mentioned before.

Conclusions:

1. Distant interaction, i.e. interaction via physical fields, regulate adhesion in the bacterium P.fluorescens;

2. Distant interaction and chemical signal(s) modulate (magnify) each other.

References:

1. Nikolaev Yu.A. Microbiology (R). 1992. V.61. No. 6. P. 1065-1071.
2. 2. Wainwright M., et all. Microbiology (B). 1997. V.143, No 1, P. 1-3.
3. Matsuhashi M., et all. J.Gen.Appl.Microbiol., 1996. V.42. P.315-323.
4. Matsuhashi M., et all. J. Bacteriol. 1995. V.177. No. 3.P. 688-693.

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