TY  - JOUR
A1  - Witzel, Katja
A1  - Strehmel, Nadine
A1  - Baldermann, Susanne
A1  - Neugart, Susanne
A1  - Becker, Yvonne
A1  - Becker, Matthias
A1  - Berger, Beatrice
A1  - Scheel, Dierk
A1  - Grosch, Rita
A1  - Schreiner, Monika
A1  - Ruppel, Silke
T1  - Arabidopsis thaliana root and root exudate metabolism is altered by the growth-promoting bacterium Kosakonia radicincitans DSM 16656(T)
T2  - Plant and soil
N2  - Plant growth-promoting bacteria (PGPB) affect host physiological processes in various ways. This study aims at elucidating the dependence of bacterial-induced growth promotion on the plant genotype and characterizing plant metabolic adaptations to PGPB. Eighteen Arabidopsis thaliana accessions were inoculated with the PGPB strain Kosakonia radicincitans DSM 16656(T). Colonisation pattern was assessed by enhanced green fluorescent protein (eGFP)-tagged K. radicincitans in three A. thaliana accessions differing in their growth response. Metabolic impact of bacterial colonisation was determined for the best responding accession by profiling distinct classes of plant secondary metabolites and root exudates. Inoculation of 18 A. thaliana accessions resulted in a wide range of growth responses, from repression to enhancement. Testing the bacterial colonisation of three accessions did not reveal a differential pattern. Profiling of plant secondary metabolites showed a differential accumulation of glucosinolates, phenylpropanoids and carotenoids in roots. Analysis of root exudates demonstrated that primary and secondary metabolites were predominantly differentially depleted by bacterial inoculation. The plant genotype controls the bacterial growth promoting traits. Levels of lutein and beta-carotene were elevated in inoculated roots. Supplementing a bacterial suspension with beta-carotene increased bacterial growth, while this was not the case when lutein was applied, indicating that beta-carotene could be a positive regulator of plant growth promotion.
KW  - Arabidopsis
KW  - Carotenoids
KW  - Glucosinolates
KW  - Plant growth promoting bacteria
KW  - Phenylpropanoids
KW  - Root exudates
Y1  - 2017
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/46291
SN  - 0032-079X
SN  - 1573-5036
VL  - 419
SP  - 557
EP  - 573
PB  - Springer
CY  - Dordrecht
ER  -