Abstract
After a decade of Arabidopsis genetics many genes with important roles in root hair development have been identified. Mutants have been used to discover genes, define their roles, and identify their DNA sequences. Plant growth regulator signaling and transcription factor genes determine which root epidermal cells form hairs. A network of gene activity has been characterized that produces a swelling on the surface of each hair cell and a single tubular outgrowth from each swelling. The molecular functions of some genes in this network have been revealed. We are approaching a molecular understanding of root hair development that will provide exciting opportunities in plant cell biology and physiology.
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