A Brassinosteroid-Insensitive Mutant in Arabidopsis thaliana Exhibits Multiple Defects in Growth and Development

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  • S. D. Clouse
    Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695 (S.D.C.)
  • M. Langford
    Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695 (S.D.C.)
  • T. C. McMorris
    Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695 (S.D.C.)

抄録

<jats:title>Abstract</jats:title> <jats:p>Brassinosteroids are widely distributed plant compounds that modulate cell elongation and division, but little is known about the mechanism of action of these plant growth regulators. To investigate brassinosteroids as signals influencing plant growth and development, we identified a brassinosteroid-insensitive mutant in Arabidopsis thaliana (L.) Henyh. ecotype Columbia. The mutant, termed bri1, did not respond to brassinosteroids in hypocotyl elongation and primary root inhibition assays, but it did retain sensitivity to auxins, cytokinins, ethylene, abscisic acid, and gibberellins. The bri1 mutant showed multiple deficiencies in developmental pathways that could not be rescued by brassinosteroid treatment, including a severely dwarfed stature; dark green, thickened leaves; male sterility; reduced apical dominance; and de-etiolation of darkgrown seedlings. Genetic analysis suggests that the Bri1 phenotype is caused by a recessive mutation in a single gene with pleiotropic effects that maps 1.6 centimorgans from the cleaved, amplified, polymorphic sequence marker DHS1 on the bottom of chromosome IV. The multiple and dramatic effects of mutation of the BRI1 locus on development suggests that the BRI1 gene may play a critical role in brassinosteroid perception or signal transduction.</jats:p>

収録刊行物

  • Plant Physiology

    Plant Physiology 111 (3), 671-678, 1996-07-01

    Oxford University Press (OUP)

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