Auxin Transport Promotes Arabidopsis Lateral Root Initiation

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ID: 298618
2001
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Abstract
Lateral root development inArabidopsis provides a model for the study of hormonal signals that regulate postembryonic organogenesis in higher plants.Lateral roots originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisions.The auxin transport inhibitor N -1-naphthylphthalamic acid (NPA) arrests lateral root development by blocking the first transverse division(s).We investigated the basis of NPA action by using a cell-specific reporter to demonstrate that xylem pole pericycle cells retain their identity in the presence of the auxin transport inhibitor.However, NPA causes indoleacetic acid (IAA) to accumulate in the root apex while reducing levels in basal tissues critical for lateral root initiation.This pattern of IAA redistribution is consistent with NPA blocking basipetal IAA movement from the root tip.Characterization of lateral root development in the shoot meristemless1 mutant demonstrates that root basipetal and leaf acropetal auxin transport activities are required during the initiation and emergence phases, respectively, of lateral root development.
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openalex_W2164018166 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ilda Casimiro, Alan Marchant, Rishikesh P. Bhalerao, Tom Beeckman, Sandra Dhooge, Ranjan Swarup, Neil S. Graham, Dirk Inzé, Göran Sandberg, Pedro J. Casero, Malcolm J. Bennett
Journal The Plant cell
Year 2001
DOI
10.1105/tpc.13.4.843
URL
https://doi.org/10.1105/tpc.13.4.843
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