Strigolactones spatially influence lateral root development through the cytokinin signaling network

Strigolactones are important rhizosphere signals that act as phytohormones and have multiple functions, including modulation of lateral root (LR) development. Here, we show that treatment with the strigolactone analog GR24 did not affect LR initiation, but negatively influenced LR priming and emerge...

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Bibliographic Details
Published in:Journal of experimental botany 2016-01, Vol.67 (1), p.379-389
Main Authors: Jiang, Lingxiang, Matthys, Cedrick, Marquez-Garcia, Belen, De Cuyper, Carolien, Smet, Lien, De Keyser, Annick, Boyer, François-Didier, Beeckman, Tom, Depuydt, Stephen, Goormachtig, Sofie
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Chemical and Process Engineering
Cytokinins - metabolism
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Engineering Sciences
Food engineering
Heterocyclic Compounds, 3-Ring - metabolism
Histidine Kinase
Lactones - metabolism
Life Sciences
Plant Roots - growth & development
Protein Kinases - genetics
Protein Kinases - metabolism
RESEARCH PAPER
Signal Transduction
Transcription Factors - genetics
Transcription Factors - metabolism
Vegetal Biology
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Summary:Strigolactones are important rhizosphere signals that act as phytohormones and have multiple functions, including modulation of lateral root (LR) development. Here, we show that treatment with the strigolactone analog GR24 did not affect LR initiation, but negatively influenced LR priming and emergence, the latter especially near the root–shoot junction. The cytokinin module ARABIDOPSIS HISTIDINE KINASE3 (AHK3)/ARABIDOPSIS RESPONSE REGULATOR1 (ARR1)/ARR12 was found to interact with the GR24-dependent reduction in LR development, because mutants in this pathway rendered LR development insensitive to GR24. Additionally, pharmacological analyses, mutant analyses, and gene expression analyses indicated that the affected polar auxin transport stream in mutants of the AHK3/ARR1/ARR12 module could be the underlying cause. Altogether, the data reveal that the GR24 effect on LR development depends on the hormonal landscape that results from the intimate connection with auxins and cytokinins, two main players in LR development.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erv478