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• W2949455887 endingPage "e0196086" @default.
• W2949455887 startingPage "e0196086" @default.
• W2949455887 abstract "The phytohormones auxin and cytokinin control development and maintenance of plant meristems and stem cell systems. Fluorescent protein reporter lines that monitor phytohormone controlled gene expression programmes have been widely used to study development and differentiation in the model species Arabidopsis, but equivalent tools are still missing for the majority of crop species. Barley (Hordeum vulgare) is the fourth most abundant cereal crop plant, but knowledge on these important phytohormones in regard to the barley root and shoot stem cell niches is still negligible. We have now analysed the role of auxin and cytokinin in barley root meristem development, and present fluorescent protein reporter lines that allow to dissect auxin and cytokinin signalling outputs in vivo. We found that application of either auxin or cytokinin to barley seedlings negatively impacts root meristem growth. We further established a barley cytokinin reporter, TCSnew, which revealed significant cytokinin signalling in the stele cells proximal to the QC, and in the differentiated root cap cells. Application of exogenous cytokinin activated signalling in the root stem cell niche. Commonly employed auxin reporters DR5 or DR5v2 failed to respond to auxin in barley. However, analysis of putative auxin signalling targets barley PLETHORA1 (HvPLT1) is expressed in a similar pattern as its orthologue AtPLT1 from Arabidopsis, i.e. in the QC and the surrounding cells. Furthermore, the PINFORMED1 (HvPIN1) auxin efflux carrier was found to be expressed in root and shoot meristems, where it polarly localized to the plasma membrane. HvPIN1 expression is negatively regulated by cytokinin and its intracellular localisation is sensitive to brefeldinA (BFA). With this study, we provide the first fluorescent reporter lines as a tool to study auxin and cytokinin signalling and response pathways in barley." @default.
• W2949455887 created "2019-06-27" @default.
• W2949455887 creator A5001481767 @default.
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• W2949455887 date "2018-04-25" @default.
• W2949455887 modified "2023-10-13" @default.
• W2949455887 title "Fluorescent reporter lines for auxin and cytokinin signalling in barley (Hordeum vulgare)" @default.
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• W2949455887 doi "https://doi.org/10.1371/journal.pone.0196086" @default.
• W2949455887 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5918912" @default.
• W2949455887 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29694399" @default.
• W2949455887 hasPublicationYear "2018" @default.
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