Root apical meristem

Growth  occurs  just  behind  the  tip  in  three  overlapping  zones  of  cells at  successive  stages of  primary  growth.  These  are  the  zones  of  cell  division,  elongation, and differentiation

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Planar Cell Polarity 

direct cells to divide in the same plane (rather than forming upper and lower tissue compartments) and to move within that same plane

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The Wnt-Ca2+ pathway is initiated by Frizzled receptors activating a classical G protein-coupled signaling pathway.

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In Wnt-Ca2+ pathway, Wnt binding to the receptor protein possibly Ryk, alone or in concert with Frizzled.

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Frizzled-G protein signaling activates PLC-beta, which cleaves PIP2 into DAG and IP3.

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Wnt/calcium pathway leads to the release of calcium stored within cells, and calcium acts as an important secondary messenger to modulate the function of many downstream targets.