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Plant architecture is shaped through the continuous formation of organs by meristems [1]. Class I KNOTTED1-like homeobox (KNOXI) genes are expressed in the shoot apical meristem (SAM) and are required for SAM maintenance [2–6]. KNOXI proteins and cytokinin, a plant hormone intimately associated with the regulation of cell division [7, 8], share overlapping roles, such as meristem maintenance and repression...
Coordination of cell and tissue polarity commonly involves directional signaling [1]. In the Arabidopsis root epidermis, cell polarity is revealed by basal, root tip-oriented, hair outgrowth from hair-forming cells (trichoblasts) [2]. The plant hormone auxin displays polar movements [1, 3] and accumulates at maximum concentration in the root tip [4, 5]. The application of polar auxin transport inhibitors...
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