02296naa a2200205 a 450000100080000000500110000800800410001902200140006002400380007410000120011224501280012426000090025250001200026152015440038165300170192570000150194270000150195770000150197277301030198710579582018-12-07       2018    bl uuuu     u00u1 u    #d  a2471-29067 a10.1094/PBIOMES-05-17-0024-R2DOI1 aVAZ, P.  aCropping history effects on pathogen suppressive and signaling dynamics in Streptomyces communities.h[electronic resource]  c2018  aArticle history: Issue Date 30 Mar 2018 // Published 12 Feb 2018 // First Look 19 Dec 2017 // Accepted 17 Dec 2017.  aABSTRACT. Diseases remain a yield-limiting factor for crops despite the availability of control measures for many pathogens. Indigenous soil microorganisms can suppress some plant pathogens, yet there is little systematic information on the effects of cropping systems on disease-suppressive populations in soil. Streptomyces have been associated with suppression of plant diseases in several naturally-occurring disease-suppressive soils. Pathogen-suppressive activity of Streptomyces communities is correlated with higher bacterial densities and for inhibitory phenotypes, driven by competition among indigenous soil bacteria. We sought to characterize relationships between cropping practices and pathogen suppression among soil Streptomyces . We evaluated bacterial and Streptomyces densities and inhibitory activities in soils from a long-term crop rotation experiment. Signaling interactions that altered inhibitory phenotypes among sympatric populations were also evaluated for a subset of samples. Soils from longer rotations, which had a higher number of plant species over time, had larger bacterial and Streptomyces densities, and more inhibitors than soils from shorter rotations. In addition, signaling occurred more frequently among isolates from higher-density communities. Our work shows that bacterial density, pathogen suppression and signaling are interrelated and are affected by crop rotation, suggesting the potential for management to optimize suppressive populations. © 2018 The American Phytopathological Society.  aSTREPTOMYCES1 aALTIER, N.1 aPÉREZ, C.1 aKINKEL, L.  tPhytobiomes Journal, 2018, Volume 2, Number 1, Pages 14-23. (First look online 2017). OPEN ACCESS.