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Immunoassay and ultrastructural localization of isopentenyladenine and related cytokinins using monoclonal antibodies

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Abstract

Two hybridoma cell lines, J40-IV-A1 and J40-IV-C4 were obtained from a fusion of spleen cells of Balb/c mice immunized against an isopentenyladenosine-bovine serum albumin conjugate with X63. Ag 8.653 myeloma cells. These hybrids secrete monoclonal antibodies of the immunoglobulin G (IgG) class and share high affinities and specificities to isopentenyladenine and isopentenyladenosine suitable for the detection of femtomole amounts of these cytokinins in plant extracts by enzyme-linked immunosorbent assay (ELISA). One of the monoclonal antibodies (J40-IV-C4) has been employed to localize isopentenyladenine immunoreactivity in a cytokinin-over-producing mutant of the moss, Physcomitrella patens. After fixation and embedding at low temperature, immunoreactivity was visualized in protonemal filaments of the moss mutant by the use of indirect immunogold labelling. In the mutant, the labelling was predominantly in the wall of the protonemal cells. Neither the wild-type nor control treatments showed any labelling. The signficance of these observations is discussed with respect to the applicability of immunocytochemical techniques for the localization of low-molecular-weight compounds in plant tissue.

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Abbreviations

ELISA:

enzyme linked immunosorbent assay

HPLC:

high-performance liquid chromatography

IP:

isopentenyladenine

IPA:

isopentenyladenosine

mAB:

monoclonal antibody

OVE:

cytokinin-over-producing mutant

RIA:

radioimmunoassay

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Authors and Affiliations

  1. Pflanzenphysiologie, Universität Osnabrück, Barbarastrasse 11, D-4500, Osnabrück, Federal Republic of Germany

    J. Eberle & E. W. Weiler

  2. John Innes Institute, Colney Lane, NR4 7UH, Norwich, UK

    T. L. Wang, S. Cook & B. Wells

Authors
  1. J. Eberle
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  2. T. L. Wang
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  3. S. Cook
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  4. B. Wells
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  5. E. W. Weiler
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Eberle, J., Wang, T.L., Cook, S. et al. Immunoassay and ultrastructural localization of isopentenyladenine and related cytokinins using monoclonal antibodies. Planta 172, 289–297 (1987). https://doi.org/10.1007/BF00398657

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  • DOI: https://doi.org/10.1007/BF00398657

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