Multiple Type-B Response Regulators Mediate Cytokinin Signal Transduction in <i>Arabidopsis</i>

DOI PDF 被引用文献21件
  • Michael G. Mason
    Department of Biological Sciences  Dartmouth College  Hanover  New Hampshire 03755
  • Dennis E. Mathews
    Department of Plant Biology  University of New Hampshire  Durham  New Hampshire 03824
  • D. Aaron Argyros
    Department of Biochemistry  University of New Hampshire  Durham  New Hampshire 03824
  • Bridey B. Maxwell
    Department of Biology  University of North Carolina  Chapel Hill  North Carolina 27599
  • Joseph J. Kieber
    Department of Biology  University of North Carolina  Chapel Hill  North Carolina 27599
  • Jose M. Alonso
    Plant Biology Laboratory  Salk Institute for Biological Studies  La Jolla  California 92037
  • Joseph R. Ecker
    Plant Biology Laboratory  Salk Institute for Biological Studies  La Jolla  California 92037
  • G. Eric Schaller
    Department of Biological Sciences  Dartmouth College  Hanover  New Hampshire 03755

抄録

<jats:title>Abstract</jats:title> <jats:p>Type-B Arabidopsis thaliana response regulators (ARRs) are transcription factors that function in the final step of two-component signaling systems. To characterize their role in plant growth and development, we isolated T-DNA insertions within six of the genes (ARR1, ARR2, ARR10, ARR11, ARR12, and ARR18) from the largest subfamily of type-B ARRs and also constructed various double and triple combinations of these mutations. Higher order mutants revealed progressively decreased sensitivity to cytokinin, including effects on root elongation, lateral root formation, callus induction and greening, and induction of cytokinin primary response genes. The triple mutant arr1,10,12 showed almost complete insensitivity to cytokinin under many of the assay conditions used. By contrast, no significant change in the sensitivity to ethylene was found among the mutants examined. These results indicate that there is functional overlap among the type-B ARRs and that they act as positive regulators of cytokinin signal transduction.</jats:p>

収録刊行物

  • The Plant Cell

    The Plant Cell 17 (11), 3007-3018, 2005-10-14

    Oxford University Press (OUP)

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