Abstract
The root-hair pattern of Arabidopsis is determined through a regulatory circuit composed of transcription factor genes. The homeobox gene GLABRA2 (GL2) has been considered a key component, acting farthest downstream in this regulation. GL2 modified to include a transactivating function caused epidermal cells to develop ectopic root hairs or root hair-like structures. With this system, the phospholipase Dzeta1 gene (AtPLDzeta1) was identified as a direct target of GL2. Inducible expression of AtPLDzeta1 promoted ectopic root-hair initiation. We conclude that GL2 exerts its regulatory effect on root-hair development through modulation of phospholipid signaling.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / genetics*
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Arabidopsis / growth & development
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Arabidopsis / metabolism*
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Arabidopsis Proteins / chemistry
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Arabidopsis Proteins / genetics*
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Arabidopsis Proteins / metabolism*
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Dexamethasone / pharmacology
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Gene Expression Regulation, Plant
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Genes, Plant
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Homeodomain Proteins / chemistry
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Homeodomain Proteins / genetics
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Homeodomain Proteins / metabolism*
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Morphogenesis
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Phospholipase D / genetics*
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Phospholipase D / metabolism
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Phospholipids / metabolism*
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Plant Epidermis / cytology
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Plant Epidermis / metabolism
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Plant Roots / cytology
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Plant Roots / growth & development*
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Plant Roots / metabolism
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Plants, Genetically Modified
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Promoter Regions, Genetic
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Signal Transduction*
Substances
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Arabidopsis Proteins
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GL2 protein, Arabidopsis
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Homeodomain Proteins
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Phospholipids
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Dexamethasone
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Phospholipase D
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phospholipase Dzeta1, Arabidopsis