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Title: Conservation tillage and organic farming induce minor variations in Pseudomonas abundance, their antimicrobial function and soil disease resistance
Authors : Dennert, Francesca
Imperiali, Nicola
Staub, Cornelia
Schneider, Jana
Laessle, Titouan
Zhang, Tao
Wittwer, Raphaël
van der Heijden, Marcel G A
Smits, Theo H M
Schlaeppi, Klaus
Keel, Christoph
Maurhofer, Monika
Published in : FEMS Microbiology Ecology
Volume(Issue) : 94
Issue : 8
Pages : fiy075
Publisher / Ed. Institution : Oxford University Press
Issue Date: 25-Apr-2018
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Pythium ultimum; Gaeumannomyces tritici; Phenazines; 2,4-diacetylphloroglucinol; Cropping system; Pyrrolnitrin; FAST
Subject (DDC) : 570: Biology
577: Ecology
Abstract: Conservation tillage and organic farming are strategies used worldwide to preserve the stability and fertility of soils. While positive effects on soil structure have been extensively reported, the effects on specific root- and soil-associated microorganisms are less known. The aim of this study was to investigate how conservation tillage and organic farming influence the frequency and activity of plant-beneficial pseudomonads. Amplicon sequencing using the 16S rRNA gene revealed that Pseudomonas is among the most abundant bacterial taxa in the root microbiome of field-grown wheat, independent of agronomical practices. However, pseudomonads carrying genes required for the biosynthesis of specific antimicrobial compounds were enriched in samples from conventionally farmed plots without tillage. In contrast, disease resistance tests indicated that soil from conventional no tillage plots is less resistant to the soilborne pathogen Pythium ultimum compared to soil from organic reduced tillage plots, which exhibited the highest resistance of all compared cropping systems. Reporter strain-based gene expression assays did not reveal any differences in Pseudomonas antimicrobial gene expression between soils from different cropping systems. Our results suggest that plant-beneficial pseudomonads can be favoured by certain soil cropping systems, but soil resistance against plant diseases is likely determined by a multitude of biotic factors in addition to Pseudomonas.
Further description : Erworben im Rahmen der Schweizer Nationallizenzen (
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific Journal
DOI : 10.1093/femsec/fiy075
ISSN: 1574-6941
Restricted until : 2021-08-01
Appears in Collections:Publikationen Life Sciences und Facility Management

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