An arabidopsis brassinosteroid-dependent mutant is blocked in cell elongation

Cell elongation is a developmental process that is regulated by light and phytohormones and is of critical importance for plant growth. Mutants defective in their response to light and various hormones are often dwarfs. The dwarfed phenotype results because of a failure in normal cell elongation. Li...

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Bibliographic Details
Published in:The Plant cell 1998-02, Vol.10 (2), p.219-230
Main Authors: Azpiroz, R. (University of Arizona, Tucson, AZ.), Wu, Y, LoCascio, J.C, Feldmann, K.A
Format: Article
Language:English
Subjects:
ALLELES
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - ultrastructure
ARABIDOPSIS THALIANA
BRASSINOLIDE
BRASSINOSTEROIDS
CELL DIFFERENTIATION
Cell growth
CELLS
COTYLEDONS
DWARFS
GENES
GENETIC INHERITANCE
Genetic mutation
GROWTH
Hypocotyls
Light
MORPHOGENESIS
MUTANTS
Mutation
Phenotype
PHENOTYPES
Plant cells
PLANT DEVELOPMENTAL STAGES
Plant growth
Plant growth regulators
Plant Growth Regulators - genetics
Plant Growth Regulators - physiology
Plants
PLASTIDS
RECESSIVE GENES
REQUIREMENTS
Seedlings
SEGREGATION
SKOTOMORPHOGENESIS
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Description
Summary:Cell elongation is a developmental process that is regulated by light and phytohormones and is of critical importance for plant growth. Mutants defective in their response to light and various hormones are often dwarfs. The dwarfed phenotype results because of a failure in normal cell elongation. Little is known, however, about the basis of dwarfism as a common element in these diverse signaling pathways and the nature of the cellular functions responsible for cell elongation. Here, we describe an Arabidopsis mutant, dwarf4 (dwf4), whose phenotype can be rescued with exogenously supplied brassinolide. dwf4 mutants display features of light-regulatory mutants, but the dwarfed phenotype is entirely and specifically brassinosteroid dependent; no other hormone can rescue dwf4 to a wild-type phenotype. Therefore, an intact brassinosteroid system is an absolute requirement for cell elongation
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.10.2.219