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Auxin Transport Promotes Arabidopsis Lateral Root Initiation

Ilda Casimiro, Alan Marchant, Rishikesh P. Bhalerao, Tom Beeckman, Sandra Dhooge, Ranjan Swarup, Neil Graham, Dirk Inzé, Goran Sandberg, Pedro J. Casero and Malcolm Bennett
The Plant Cell
Vol. 13, No. 4 (Apr., 2001), pp. 843-852
DOI: 10.2307/3871344
Stable URL: http://www.jstor.org/stable/3871344
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Auxin Transport Promotes Arabidopsis Lateral Root Initiation
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Abstract

Lateral root development in Arabidopsis 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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