Cited by 384Plant Parasitism and ResistancePlant biochemistry and biosynthesisPlant Molecular Biology Research

Strigolactones enhance competition between shoot branches by dampening auxin transport

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Crawford, Scott, Shinohara, Naoki, Sieberer, Tobias, Williamson, Lisa, George, Gilu, Hepworth, Jo, Müller, Dörte, Domagalska, Malgorzata A. +1 more·2010·Development

Abstract

Strigolactones (SLs), or their derivatives, were recently demonstrated to act as endogenous shoot branching inhibitors, but their biosynthesis and mechanism of action are poorly understood. Here we show that the branching phenotype of mutants in the Arabidopsis P450 family member, MAX1, can be fully rescued by strigolactone addition, suggesting that MAX1 acts in SL synthesis. We demonstrate that SLs modulate polar auxin transport to control branching and that both the synthetic SL GR24 and endogenous SL synthesis significantly reduce the basipetal transport of a second branch-regulating hormone, auxin. Importantly, GR24 inhibits branching only in the presence of auxin in the main stem, and enhances competition between two branches on a common stem. Together, these results support two current hypotheses: that auxin moving down the main stem inhibits branch activity by preventing the establishment of auxin transport out of axillary branches; and that SLs act by dampening auxin transport, thus enhancing competition between branches.

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Crossref · 10.1242/dev.051987

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  • Competition between the main shoot apex and axillary buds for access to a common PAT stream (PATS) was suggested to control shoot branching.

    “To apply the canalization model to the control of shoot branching, competition between the main shoot apex and axillary buds for access to a common PAT stream (PATS) was suggested”

    From Multiple pathways regulate shoot branching (2015) · cites this paper as Crawford et al., 2010

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Authors
Crawford, S., Shinohara, N., Sieberer, T., Williamson, L., George, G., Hepworth, J., Müller, D., Domagalska, M. A., & Leyser, O.
Affiliations
University of York (GB)
Corresponding author
Leyser, Ottoline
Venue
Development
Published
2010-09-01
Volume
137
Issue
17
Pages
2905-2913
ISSN
  • 0950-1991 (ISSN-L)
  • 1477-9129
OpenAlex
W2024692117
Cited by
384
References
74
Citations by year
2026: 9 · 2025: 15 · 2024: 21 · 2023: 15 · 2022: 29 · 2021: 21 · 2020: 26 · 2019: 28 · 2018: 14 · 2017: 30 · 2016: 25 · 2015: 29 · 2014: 32 · 2013: 30 · 2012: 33
FWCI
34.61
Type
journal article
Language
en
Open access
Locations
  • Development (publishedVersion)
  • PubMed (publishedVersion)
  • Phaidra (Universität Wien) (submittedVersion, cc-by-nc-nd)
  • Durham Research Online (Durham University) (submittedVersion, cc-by)
Funders
  • European Commission
  • Biotechnology and Biological Sciences Research Council (BB/C518057/1)
  • Japan Society for the Promotion of Science
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
Keywords
strigolactones, shoot branching, polar auxin transport, MAX1, GR24, auxin transport, axillary buds, Arabidopsis thaliana, plant hormones
MeSH terms
Base Sequence, Biological Transport, Active, Indoleacetic Acids, Lactones, Mutation, Phenotype, Plant Growth Regulators, Genes, Plant, Arabidopsis, DNA Primers, Plant Shoots, Membrane Transport Proteins, Arabidopsis Proteins, Plants, Genetically Modified, Xylem

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