Epidermal Cell Fate Determination in Arabidopsis: Patterns Defined by a Steroid-Inducible Regulator

The Arabidopsis mutant ttg lacks both trichomes (epidermal hairs) and anthocyanin pigments. Trichomes and anthocyanins are restored by the constitutive expression of the maize transcriptional regulator (R). The expression of an R-glucocorticoid receptor chimeric protein results in a steroid hormone-...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) Vol. 266; no. 5184; pp. 436 - 439
Main Authors: Lloyd, Alan M., Schena, Mark, Walbot, Virginia, Davis, Ronald W.
Format: Journal Article
Language:English
Published: Washington, DC American Society for the Advancement of Science 21.10.1994
American Association for the Advancement of Science
Subjects:
Alleles
Amino acids
Anthocyanins - biosynthesis
Anthocyanins - genetics
Arabidopsis
Arabidopsis - cytology
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - metabolism
Biological and medical sciences
Cell differentiation
Cell physiology
Cell regulation
Cellular control mechanisms
Dexamethasone - pharmacology
Epidermal cells
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant
Hormones
Leaves
Microscopy, Electron, Scanning
Pigments
Plant cells
Plant Leaves - cytology
Plant Leaves - growth & development
Plant Leaves - ultrastructure
Plant physiology and development
Receptors, Glucocorticoid - physiology
Recombinant Fusion Proteins
Regulator genes
Seedlings
Steroids
Trans-Activators - physiology
Transformation, Genetic
Trichomes
Anthocyanin
Biosynthesis
Determination
Gene expression
Trichome
Arabidopsis thaliana
Cruciferae
Dicotyledones
Angiospermae
Hormonal regulation
Pigments
Development
Spermatophyta
Differentiation
Hybrid gene
ISSN:0036-8075, 1095-9203
Online Access:Get full text
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Summary:The Arabidopsis mutant ttg lacks both trichomes (epidermal hairs) and anthocyanin pigments. Trichomes and anthocyanins are restored by the constitutive expression of the maize transcriptional regulator (R). The expression of an R-glucocorticoid receptor chimeric protein results in a steroid hormone-dependent, conditional allele of R that functions in whole Arabidopsis plants. The response of the chimeric protein to pulses of hormone was used to define the pattern and timing of trichome formation on the developing leaf epidermis. Each adaxial epidermal leaf cell appears to have an equal probability of differentiating into a trichome; there is a temporal zone of decision for trichome cell fate that proceeds as a wave from the tip to the base of developing leaves.
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.7939683