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Fig. 9. Model for a conserved NS/PRS function during the recruitment of a lateral
founder-cell domain in vegetative (A,B) and reproductive (C) shoot meristems
of maize (A) and Arabidopsis (B,C). NS/PRS function initiates from
lateral foci (red arrows) and recruits founder cells in a lateral meristematic
domain (yellow). Recruitment of the central domain founder cells (green)
occurs prior to recruitment of the lateral domain. In vegetative apices that
produce a single leaf per node, recruitment of the central founder-cell domain
occurs from a single flank of the apex and proceeds bi-directionally toward
the lateral domain foci, whereas in the Arabidopsis floral meristem
this recruitment commences simultaneously from both the adaxial and abaxial
flanks of the apex. Loss of NS/PRS function causes failure to develop any and
all organ domains that are normally derived from the lateral founder-cell
domain of the meristem. Further details of this organ domain-blind model of
NS/PRS are explained in the text.
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