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Subcellular distribution of arabinogalactan proteins in pollen grains and tubes as revealed with a monoclonal antibody raised against stylar arabinogalactan proteins

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Summary

Monoclonal antibody PCBC3, raised against stylar extracts fromNicotians, alata flowers, was deduced from enzyme-linked immunosorbent assays and inhibition of immuno-gold labelling on tissue sections to bind specifically to carbohydrate epitopes on arabinogalactan proteins (AGPs) but not to other arabinose-containing cell wall polysaccharides. When pollen grains ofN. tabacum were hydrated in fixative, PCBC3 bound to vesicles in the vicinity of the endoplasmic reticulum but, when grains were hydrated for 20 min in culture medium before fixation, binding was restricted to the plasma membrane. The generative-cell plasma membrane was also labelled in grains ofLycopersicon peruvianum. In pollen tubes ofN. tabacum grown in liquid culture, the AGPs detected by PCBC3 were located in several regions, including the plasma membrane, tubular-vesicular structures (plasmalemmasomes) at and under the plasma membrane, and multilamellar bodies within vacuoles, features generally associated with endocytosis. Labelling was not evident in secretory vesicles or the plasma membrane at the pollen-tube tip. The AGPs detected with PCBC3 were also present in pollen-tube walls, near the interface between the inner, callosic layer and the outer, fibrillar, pectic layer. Pollen tubes ofN. tabacum grown in medium lacking added CuSO4 produce a wall with an abnormally thickened fibrillar layer, and this layer was uniformly labelled with PCBC3. The disposition of wall AGPs thus changes in pollen tubes of different morphologies.

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Abbreviations

AGP:

arabinogalactan protein

α-L-Araf :

α-L-arabinofuranose

ELISA:

enzyme-linked immunosorbent assay

MAb:

monoclonal antibody

PBS:

phosphate-buffered saline

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Authors and Affiliations

  1. European Molecular Biology Laboratory, Heidelberg

    C. Ferguson

  2. Plant Cell Biology Research Centre, School of Botany, University of Melbourne, 3052, Parkville, VIC, Australia

    C. Ferguson & A. Bacic

  3. Department of Biochemistry, La Trobe University, Bundoora, Victoria

    M. A. Anderson

  4. School of Forestry, University of Melbourne, Creswick, Victoria

    S. M. Read

Authors
  1. C. Ferguson
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  2. A. Bacic
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  3. M. A. Anderson
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  4. S. M. Read
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Ferguson, C., Bacic, A., Anderson, M.A. et al. Subcellular distribution of arabinogalactan proteins in pollen grains and tubes as revealed with a monoclonal antibody raised against stylar arabinogalactan proteins. Protoplasma 206, 105–117 (1999). https://doi.org/10.1007/BF01279257

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  • DOI: https://doi.org/10.1007/BF01279257

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