Positioning of the auxin maximum affects the character of cells occupying the root stem cell niche

Abstract

Using a microarray-based approach the root meristem of maize was profiled.⁶ Three populations were characterized; the root cap, the quiescent center and the proximal meristem. From these data we here consider the central role of auxin in defining and establishing the root stem cell niche.

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Figures and Tables

Figure 1 (A-D) immunolocalization of auxin in Zea mays roots treated for 24 h with ascorbic acid (AA ) and then examined 24 and 48 h after ending the AA treatment. Arrows point to the position of the auxin maximum. Immunolocalization of auxin was done as described by Jiang et al.10

Table 1 Auxin-transport gene expression in the maize root tip

Table 2 Relative levels of expression of auxin-related genes in the proximal meristem (PM) and quiescent center (QC), at various times (0, +6, +20, +32 h) after removal of the root cap and activation of the QC^a

Table 3 AFRs and PLT expression in the maize root tip^a

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