An Arabidopsis brassinosteroid-dependent mutant is blocked in cell elongation

Ricardo Azpiroz, Yewen Wu, Jeffrey C. Locascio, Kenneth A. Feldmann

Research output: Contribution to journalArticlepeer-review

251 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)219-230
Number of pages12
JournalPlant Cell
Issue number2
StatePublished - 1998

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology


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