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Identification of quorum sensing signal molecules and oligolignols associated with watermark disease in willow (Salix sp.) by Hanneke Huvenne; Geert Goeminne; Martine Maes; Eric Messens is a Chemistry article available to read on EtoBox.

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The bacterium Brenneria salicis is the causal agent of watermark disease in willow. This work shows the importance of in situ studies and high-resolution separation of biological samples with ultrahigh performance liquid chromatography combined with ion trap mass spectrometry to unambiguously identify molecular compounds associated with this disease. Approximately 40 oligolignols accumulated in wood sap of watermark diseased willow, and are indicative for degradation of the xylem cell wall, of which 15 were structurally assigned based on an earlier study. Many bacteria are known to produce and release quorum sensing signal molecules that switch on the expression of specific, sometimes pathogenic functions. Two quorum sensing signal molecules, N-(3-oxohexanoyl)-l-homoserine lactone and N-(hexanoyl)-l-homoserine lactone, were present in 4/1 ratios in diseased wood and in high-density in vitro cultures of B. salicis at 0.13-1.2 microM concentrations, and absent in healthy wood and in low-density in vitro cultures of B. salicis. Although it is not a proof, it can be an indication for involvement of quorum sensing in B. salicis pathogenesis. Cyclic dipeptides were present at high concen

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Author

Hanneke Huvenne; Geert Goeminne; Martine Maes; Eric Messens

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-376X)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)