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A Map of KNAT Gene Expression in the Arabidopsis Root

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Abstract

Homeodomain proteins are key regulators of patterning during the development of animal and plant body plans. Knotted1-like TALE homeodomain proteins have been found to play important roles in the development of the Arabidopsis shoot apical meristem and are part of a complex regulatory network of protein interactions. We have investigated the possible role of the knotted1-like genes KNAT1, KNAT3, KNAT4, and KNAT5 in Arabidopsis root development. Root growth is indeterminate, and the organ shows distinct zones of cell proliferation, elongation and differentiation along its longitudinal axis. Here we show that KNAT1, KNAT3, KNAT4 and KNAT5 show cell type specific expression patterns in the Arabidopsis root. Moreover, they are expressed in different spatially restricted patterns along the longitudinal root axis and in lateral root primordia. Hormones play an important role in maintenance of root growth, and we have studied their effect on KNAT gene expression. We show that KNAT3 expression is repressed by moderate levels of cytokinin. In addition, we show that the subcellular localization of KNAT3 and KNAT4 is regulated, indicating post-translational control of the activities of these transcription factors. The regulated expression of KNAT1, KNAT3, KNAT4 and KNAT5 within the Arabidopsis root suggests a role for these genes in root development. Our data provide the first systematic survey of KNAT gene expression in the Arabidopsis root.

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Abbreviations

GUS:

β-glucuronidase

UAS:

upstream activating sequence

ACC:

1-aminocyclopropane-1-carboxylic acid

IAA:

indole-3-acetic acid

YFP:

yellow fluorescent protein

GFP:

green fluorescent protein

NLS:

nuclear import signal

TALE:

three amino acid loop extension, class of homeodomain proteins

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Authors and Affiliations

  1. Department of Plant Sciences, University of Cambridge, CB2 3EA, Downing Site, Cambridge, UK

    Elisabeth Truernit, Kirby R. Siemering, Sarah Hodge, Vojislava Grbic & Jim Haseloff

  2. Murdoch Children’s Research Institute, Royal Children’s Hospital, Flemington Road, 3052, Parkville, Melbourne, Australia

    Kirby R. Siemering

  3. School of Biological Sciences, 1800, Stopford Building, Oxford Road, M13 9PT, Manchester, UK

    Sarah Hodge

  4. Department of Biology, The University of Western Ontario, N6A 5B7, London, Ontario, Canada

    Vojislava Grbic

Authors
  1. Elisabeth Truernit
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  2. Kirby R. Siemering
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  3. Sarah Hodge
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  4. Vojislava Grbic
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  5. Jim Haseloff
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Corresponding author

Correspondence to Jim Haseloff.

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Truernit, E., Siemering, K.R., Hodge, S. et al. A Map of KNAT Gene Expression in the Arabidopsis Root. Plant Mol Biol 60, 1–20 (2006). https://doi.org/10.1007/s11103-005-1673-9

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  • DOI: https://doi.org/10.1007/s11103-005-1673-9

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