J4-3631 — Annual report 2012
1.
Ecological drivers of bacterial social evolution

A lecture presented by the project leader (IMM) was chosen for oral presentation among 1700 abstract at the 14th ISME conference in Copenhagen, which is the most important and largest conference on microbial ecology in the world. The talk indicated quorum sensing (QS) as a paradigm mechanism of social behaviour in bacteria and the main achievements of this project were presented. This pertains to diversification of the QS system in relation to ecotypes. Using strains isolated from soil microscale we recently showed that (1) multiple ecotypes of B. subtilis coexist within the soil microscale and, most importantly, (2) that each pherotype found within this species, is largely, although not perfectly, associated with a single ecotype. These experimental findings were then used as a basis for two new models (pherotype cycling model and occasional advantage model) that propose to explain the origin and maintenance of this diversity and the advantage of occasional communication across ecotypes and even different species taxons. In addition, results changes of the QS response were observed in mixed populations containing wild type and QS mutant strains.

B.03 Paper at an international scientific conference

COBISS.SI-ID: 4129912
2.
Quorum sensing in plantonic and colony mixed cultures of wild and mute Bacillus subtilis

The work was presented at the international student conference in Jena, Germany by the PhD student, A. Oslyzlo, who is a young investigator under the supervision of coordinator of this project . For the first time it was demonstrated that the growth mode influences the quorum sensing (QS) response of bacterial co-cultures composed of the wild type cells and mutant cells The work presented addressed fundamental questions in sociomicrobiology and provided novel data and insights that are highly relevant to the field of bacterial signalling.

B.03 Paper at an international scientific conference

COBISS.SI-ID: 4192888