Cited by 245Plant Molecular Biology ResearchPlant Parasitism and ResistanceDevelopmental Biology and Gene Regulation

Arabidopsis REGULATOR OF AXILLARY MERISTEMS1 Controls a Leaf Axil Stem Cell Niche and Modulates Vegetative Development

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Keller, Thomas, Abbott, Jessica, Moritz, Thomas, Doerner, Peter·2006·The Plant Cell

Abstract

Shoot branching is a major determinant of variation in plant stature. Branches, which form secondary growth axes, originate from stem cells activated in leaf axils. The initial steps by which axillary meristems (AMs) are specified and their stem cells organized are still poorly understood. We identified gain- and loss-of-function alleles at the Arabidopsis thaliana REGULATOR OF AXILLARY MERISTEMS1 (RAX1) locus. RAX1 is encoded by the Myb-like transcription factor MYB37 and is an Arabidopsis homolog of the tomato (Solanum lycopersicum) Blind gene. RAX1 is transiently expressed in a small central domain within the boundary zone separating shoot apical meristem and leaf primordia early in leaf primordium development. RAX1 genetically interacts with CUP-SHAPED COTYLEDON (CUC) genes and is required for the expression of CUC2 in the RAX1 expression domain, suggesting that RAX1 acts through CUC2. We propose that RAX1 functions to positionally specify a stem cell niche for AM formation. RAX1 also affects the timing of developmental phase transitions by negatively regulating gibberellic acid levels in the shoot apex. RAX1 thus defines a novel activity that links the specification of AM formation with the modulation of the rate of progression through developmental phases.

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Crossref · 10.1105/tpc.105.038588

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49 of 49 references verified0 citation errors · 0 not checkable

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  • In addition to LAS, RAX1, BL, and C influence axillary meristem development.

    “In addition to LAS, the MYB factors REGULATOR OF AXILLARY MERISTEMS1 (RAX1) in Arabidopsis (Keller et al., 2006), as well as BLIND (BL) and POTATO LEAF (C) in tomato (Schmitz et al., 2002; Busch et al., 2011), influence axillary meristem development.”

    From Shaping plant architecture (2015) · cites this paper as Keller et al., 2006

  • A small subgroup of MYB genes related to the tomato Blind gene modulate axillary meristem formation along the shoot axis in tomato and Arabidopsis.

    “Furthermore, a small subgroup of MYB genes, related to the tomato Blind gene, were shown to modulate axillary meristem formation along the shoot axis in tomato (Schmitz et al., 2002) and Arabidopsis (Keller et al., 2006;M€ uller et al., 2006).”
  • RAX1 is specifically expressed in the boundary region between SAM and leaf primordia and modulates AM formation during early vegetative development in Arabidopsis.

    “Another R2R3 MYB protein, called REGULATOR OF AXILLARY MERISTEMS1 (RAX1), which is also specifically expressed in the boundary region between SAM and leaf primordia, modulates AM formation during early vegetative development in Arabidopsis (Keller et al., 2006;M€ uller et al., 2006), whereas the orthologous genes in pepper (Capsicum annuum) and tomato regulate both AM initiation and transition to”
  • Loss-of-function mutants of RAX1 have a reduced number of axillary meristems.

    “| RAX1 | Bl (tomato) | MYB | Reduced number of AMs | SAM and leaf primordia | Keller et al. (2006); M€ uller et al. |”

    From <i>Divide et impera</i>: boundaries shape the plant body and initiate new meristems (2016) · cites this paper as Keller et al. (2006)

  • RAX1 is expressed in the boundary between the SAM and leaf primordia.

    “| RAX1 | Bl (tomato) | MYB | Reduced number of AMs | SAM and leaf primordia | Keller et al. (2006); M€ uller et al. |”

    From <i>Divide et impera</i>: boundaries shape the plant body and initiate new meristems (2016) · cites this paper as Keller et al. (2006)

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Authors
Keller, T., Abbott, J., Moritz, T., & Doerner, P.
Affiliations
  • University of Edinburgh (GB)
  • Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90187 Umeå, Sweden
Venue
The Plant Cell
Published
2006-02-10
Volume
18
Issue
3
Pages
598-611
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2103870230
Cited by
245
References
49
Citations by year
2026: 6 · 2025: 21 · 2024: 11 · 2023: 15 · 2022: 26 · 2021: 15 · 2020: 11 · 2019: 11 · 2018: 6 · 2017: 9 · 2016: 15 · 2015: 21 · 2014: 10 · 2013: 10 · 2012: 10
FWCI
12.31
Type
journal article
Language
en
Open access
Locations
  • The Plant Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Biotechnology and Biological Sciences Research Council
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
axillary meristem, shoot branching, shoot apical meristem, CUC2, gibberellin, plant height, Arabidopsis thaliana
MeSH terms
Alleles, Gibberellins, Molecular Sequence Data, Mutation, Phylogeny, Stem Cells, Transcription Factors, Biomarkers, Transcriptional Activation, Arabidopsis, Gene Expression Regulation, Plant, Plant Leaves, Meristem, Gene Dosage, Proto-Oncogene Proteins c-myb, Arabidopsis Proteins

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