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)
JF  - 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
U6  - https://doi.org/10.1007/s11104-017-3371-1
SN  - 0032-079X
SN  - 1573-5036
VL  - 419
SP  - 557
EP  - 573
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Zhou, Ying
A1  - Zhang, Ling
A1  - Gui, Jiadong
A1  - Dong, Fang
A1  - Cheng, Sihua
A1  - Mei, Xin
A1  - Zhang, Linyun
A1  - Li, Yongqing
A1  - Su, Xinguo
A1  - Baldermann, Susanne
A1  - Watanabe, Naoharu
A1  - Yang, Ziyin
T1  - Molecular Cloning and Characterization of a Short-Chain Dehydrogenase Showing Activity with Volatile Compounds Isolated from Camellia sinensis
JF  - Plant molecular biology reporter
N2  - Camellia sinensis synthesizes and emits a large variety of volatile phenylpropanoids and benzenoids (VPB). To investigate the enzymes involved in the formation of these VPB compounds, a new C. sinensis short-chain dehydrogenase/reductase (CsSDR) was isolated, cloned, sequenced, and functionally characterized. The complete open reading frame of CsSDR contains 996 nucleotides with a calculated protein molecular mass of 34.5 kDa. The CsSDR recombinant protein produced in Escherichia coli exhibited dehydrogenase-reductase activity towards several major VPB compounds in C. sinensis flowers with a strong preference for NADP/NADPH co-factors, and showed affinity for (R)/(S)-1-phenylethanol (1PE), phenylacetaldehyde, benzaldehyde, and benzyl alcohol, and no affinity for acetophenone (AP) and 2-phenylethanol. CsSDR showed the highest catalytic efficiency towards (R)/(S)-1PE. Furthermore, the transient expression analysis in Nicotiana benthamiana plants validated that CsSDR could convert 1PE to AP in plants. CsSDR transcript level was not significantly affected by floral development and some jasmonic acid-related environmental stress, and CsSDR transcript accumulation was detected in most floral tissues such as receptacle and anther, which were main storage locations of VPB compounds. Our results indicate that CsSDR is expressed in C. sinensis flowers and is likely to contribute to a number of floral VPB compounds including the 1PE derivative AP.
KW  - Camellia sinensis
KW  - 1-Phenylethanol
KW  - Phenylpropanoids
KW  - Short chain dehydrogenase
KW  - Volatile compound
Y1  - 2015
U6  - https://doi.org/10.1007/s11105-014-0751-z
SN  - 0735-9640
SN  - 1572-9818
VL  - 33
IS  - 2
SP  - 253
EP  - 263
PB  - Springer
CY  - New York
ER  -