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Rankl, S. ; Gunse, B.* ; Sieper, T. ; Schmid, C. ; Poschenrieder, C.* ; Schröder, P.

Microbial homoserine lactones (AHLs) are effectors of root morphological changes in barley.

Plant Sci. 253, 130-140 (2016)
Postprint DOI
Open Access Green
While colonizing the rhizosphere, bacterial intra- and inter-specific communication is accomplished by N-Acyl-homoserine-lactones (AHLs) in a density-dependent manner. Moreover, plants are naturally exposed to AHLs and respond with tissue-specificity. In the present study, we investigated the influence of N-hexanoyl- (C6-HSL), N-octanoyl- (C8-HSL) and N-dodecanoyl-D/L-homoserine lactone (C12-HSL) on growth and root development in barley (Hordeum vulgare L.), and identified initial reactions in root cells after AHL exposures using physiological, staining, and electrophysiological methods. Treatment with short- and long-chain AHLs modulated plant growth and branched root architecture and induced nitric oxide (NO) accumulation in the calyptra and root elongation zone of excised roots in an AHL derivative-independent way. Additionally, C6- and C8-HSL treatments stimulated K+ uptake in root cells only at certain concentrations, whereas all tested concentrations of C12-HSL induced K+ uptake. In further experiments, C8-HSL promoted membrane hyperpolarization in epidermal root cells. Thus, we conclude AHLs promote plant growth and lateral root formation, and cause NO accumulation as an early response to AHLs. Furthermore, the AHL-mediated membrane hyperpolarization is leading to increased K+ uptake of the root tissue.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Hordeum Vulgare ; Membrane Hyperpolarization ; Nitric Oxide ; Nutrient Uptake ; Quorum Sensing ; Root Development; Guard-cell Protoplasts; Plasma-membrane Transporters; Serratia-marcescens 90-166; Quorum-sensing Signals; Nitric-oxide; Arabidopsis-thaliana; Plant-growth; Azospirillum-brasilense; Systemic Resistance; Innate Immunity
ISSN (print) / ISBN 0168-9452
e-ISSN 0168-9452
Journal Plant Science
Quellenangaben Volume: 253, Issue: , Pages: 130-140 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place Clare
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Research Unit Comparative Microbiome Analysis (COMI)