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Auxin reflux between the endodermis and pericycle promotes lateral root initiation

Peter Marhavy (UGent) , Marleen Vanstraelen (UGent) , Bert De Rybel (UGent) , Zhaojun Ding (UGent) , Malcolm J Bennett, Tom Beeckman (UGent) and Eva Benkova (UGent)
(2013) EMBO JOURNAL. 32(1). p.149-158
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Abstract
Lateral root (LR) formation is initiated when pericycle cells accumulate auxin, thereby acquiring founder cell (FC) status and triggering asymmetric cell divisions, giving rise to a new primordium. How this auxin maximum in pericycle cells builds up and remains focused is not understood. We report that the endodermis plays an active role in the regulation of auxin accumulation and is instructive for FCs to progress during the LR initiation (LRI) phase. We describe the functional importance of a PIN3 (PIN-formed) auxin efflux carrier-dependent hormone reflux pathway between overlaying endodermal and pericycle FCs. Disrupting this reflux pathway causes dramatic defects in the progress of FCs towards the next initiation phase. Our data identify an unexpected regulatory function for the endodermis in LRI as part of the fine-tuning mechanism that appears to act as a check point in LR organogenesis after FCs are specified.
Keywords
CELL-CYCLE, EFFLUX, GENE-EXPRESSION, ARABIDOPSIS-THALIANA, pericycle, lateral root initiation, founder cell, endodermis, auxin, TRANSPORT, FAMILY, ORGANIZATION, GRADIENTS, PROTEINS, MERISTEM

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Chicago
Marhavy, Peter, Marleen Vanstraelen, Bert De Rybel, Zhaojun Ding, Malcolm J Bennett, Tom Beeckman, and Eva Benkova. 2013. “Auxin Reflux Between the Endodermis and Pericycle Promotes Lateral Root Initiation.” Embo Journal 32 (1): 149–158.
APA
Marhavy, P., Vanstraelen, M., De Rybel, B., Ding, Z., Bennett, M. J., Beeckman, T., & Benkova, E. (2013). Auxin reflux between the endodermis and pericycle promotes lateral root initiation. EMBO JOURNAL, 32(1), 149–158.
Vancouver
1.
Marhavy P, Vanstraelen M, De Rybel B, Ding Z, Bennett MJ, Beeckman T, et al. Auxin reflux between the endodermis and pericycle promotes lateral root initiation. EMBO JOURNAL. 2013;32(1):149–58.
MLA
Marhavy, Peter, Marleen Vanstraelen, Bert De Rybel, et al. “Auxin Reflux Between the Endodermis and Pericycle Promotes Lateral Root Initiation.” EMBO JOURNAL 32.1 (2013): 149–158. Print.
@article{3165958,
  abstract     = {Lateral root (LR) formation is initiated when pericycle cells accumulate auxin, thereby acquiring founder cell (FC) status and triggering asymmetric cell divisions, giving rise to a new primordium. How this auxin maximum in pericycle cells builds up and remains focused is not understood. We report that the endodermis plays an active role in the regulation of auxin accumulation and is instructive for FCs to progress during the LR initiation (LRI) phase. We describe the functional importance of a PIN3 (PIN-formed) auxin efflux carrier-dependent hormone reflux pathway between overlaying endodermal and pericycle FCs. Disrupting this reflux pathway causes dramatic defects in the progress of FCs towards the next initiation phase. Our data identify an unexpected regulatory function for the endodermis in LRI as part of the fine-tuning mechanism that appears to act as a check point in LR organogenesis after FCs are specified.},
  author       = {Marhavy, Peter and Vanstraelen, Marleen and De Rybel, Bert and Ding, Zhaojun and Bennett, Malcolm J and Beeckman, Tom and Benkova, Eva},
  issn         = {0261-4189},
  journal      = {EMBO JOURNAL},
  language     = {eng},
  number       = {1},
  pages        = {149--158},
  title        = {Auxin reflux between the endodermis and pericycle promotes lateral root initiation},
  url          = {http://dx.doi.org/10.1038/emboj.2012.303},
  volume       = {32},
  year         = {2013},
}

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