Immunocytochemical localisation of actin and profilin in the generative cell of angiosperm pollen: TEM studies on high-pressure frozen and freeze-substitutedLedebouria socialis Roth (Hyacinthaceae) |
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Authors: | Michael W Hess Irene Mittermann Christian Luschnig Rudolf Valenta |
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Institution: | (1) Institut für Botanik, Universität Wien, Vienna, Austria;(2) Institut für Histologie und Embryologie, Müllerstrasse 59, A-6020 Innsbruck, Austria;(3) Institut für Allgemeine und Experimentelle Pathologie, Universität Wien, Vienna, Austria |
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Abstract: | Actin was demonstrated for the first time at the EM level in the generative cell of mature angiosperm pollen by using immuno-gold labelling of high-pressure frozen and freeze-substitutedLedebouria socialis Roth anthers. In addition, profilin, an actin-monomer binding protein, is shown to coexist in the generative cell. We attribute the detection of actin and profilin to the applied cryomethods which yield a much better preservation of ultrastructure and antigenicity of delicate cytoskeletal constituents than conventional fixation techniques. Actin labelling was observed within the cytoplasm of the generative cell and became especially clear in close vicinity to microtubular bundles. Filamentous structures congruent with the actin labelling patterns do occur, but are not a frequent feature. Profilin was localised throughout the cytoplasm.Abbreviations Ac Acetone
BSA
bovine serum albumin
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CFS
calf fetal serum
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CGA
chicken gizzard actin
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EA
Epon-Araldite
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E-PTA
ethanolic phosphotungstic acid
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FG
fish gelatine
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GC
generative cell
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LR
LR white
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mAb
monoclonal antibody
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Os
osmium tetroxide
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Pb
lead-staining
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PBS
phosphate-buffered saline
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UA
uranyl acetate |
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