Planar polarity of root hair positioning in Arabidopsis
Biochemical Society Transaction: 2007 35:149-151
The co-ordinated polarity of cells within the plane of a single
tissue layer (planar polarity) is intensively studied in animal
epithelia but has only recently been systematically analysed in plants.
The polar positioning of hairs in the root epidermis of Arabidopsis thaliana
provides an easily accessible system for the functional dissection of a
plant-specific planar polarity. Recently, mutants originally isolated
in genetic screens for defects in root hair morphogenesis and changes
in the sensitivity to or the production of the plant hormones auxin and
ethylene have identified players that contribute to polar root hair
placement. Here, we summarize and discuss recent progress in research
on polar root hair positioning from studies in Arabidopsis.
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