Abstract
The location of the (1→3)-β-glucan, callose, in the walls of pollen tubes in the style of Nicotiana alata Link et Otto was studied using specific monoclonal antibodies. The antibodies were raised against a laminarinhaemocyanin conjugate. One antibody selected for further characterization was specific for (1→3)-β-glucans and showed no binding activity against either a cellopentaose-bovine serum albumin (BSA) conjugate or a (1→3, 1→4)-β-glucan-BSA conjugate. Binding was inhibited by (1→3)-β-oligoglucosides (DP, 3–6) with maximum competition being shown by laminaripentaose and laminarihexaose, indicating that the epitope included at least five (1→3)-β-linked glucopyranose residues. The monoclonal antibody was determined to have an affinity constant for laminarihexaose of 2.7. 104M−1. When used with a second-stage gold-labelled, rabbit anti-mouse antibody, the monoclonal antibody probe specifically located the (1→3)-β-glucan in the inner wall layer of thin sections of the N. alata pollen tubes.
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Abbreviations
- BSA:
-
bovine serum albumin
- PBS:
-
phosphate-buffered saline
- ELISA:
-
enzyme linked immunosorbent assay
- DP:
-
degree of polymerization
- PVC:
-
polyvinyl chloride
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P.J.M. is an Australian Postdoctoral Research Fellow. We wish to thank Joan Hoogenraad for her technical assistance with the tissue culture, and Althea Wright for her assistance in the preparation of this paper.
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Meikle, P.J., Bonig, I., Hoogenraad, N.J. et al. The location of (1→3)-β-glucans in the walls of pollen tubes of Nicotiana alata using a (1→3)-β-glucan-specific monoclonal antibody. Planta 185, 1–8 (1991). https://doi.org/10.1007/BF00194507
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DOI: https://doi.org/10.1007/BF00194507