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Positional information is an important determinant in the establishment of cellular identity in plants. It is established during pattern formation and is maintained in growing organs. Cells maintain the ability to respond to changes in positional information during development indicating that the mechanism for perceiving such information must remain intact until relatively late in development. Once positional cues are perceived they set in motion a number of cascades resulting in the differentiation of particular cell types in defined locations. The circuitry underpinning these later events is being teased out using genetics. Evidence is emerging for the existence of an array of both positive and negative genetic regulators from studies in a number of diverse plant model systems

Original publication




Journal article


Semin Cell Dev Biol

Publication Date





149 - 156


Arabidopsis, Cell Differentiation, Cell Lineage, Gene Expression Regulation, Developmental, Gene Expression Regulation, Plant, Genes, Plant, Meristem, Mosaicism, Plant Physiological Phenomena, Plant Proteins, Plant Roots, Signal Transduction