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Ultrastructural analysis of plastids in angiosperm pollen tubes

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Summary

When Rhododendron pollen tubes are cultured in the dark, electron-dense bodies are present that appear to be a metabolically altered form of a proplastid that is difficult to fix for electron microscopy, and whose membranes may not be intact. When similar pollen tubes are cultured in a dark/light regime, ultrastructurally well-defined proplastids are present after fixation in glutaraldehyde with PIPES buffer and tannic acid, followed by osmic acid. This fixation technique also gave the best ultrastructural images of those proplastids in pollen tubes grown in the dark. Pollen tube plastids have the potential to become chromoplasts when cultured in a dark/light regime as evidenced by the presence of branched tubules characteristic of these organelles. Light appears to be a hitherto neglected environmental factor involved in regulating pollen tube growth. This improved fixation procedure demonstrates the bilayered nature of the membranes surrounding sperm cells and the existence of cytoplasmic channels connecting sperm cell and pollen tube plasma membranes.

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  1. I. A. Staff

    Present address: School of Botany, University of Melbourne, 3052, Parkville, Victoria, Australia

Authors and Affiliations

  1. Botany Department, LaTrobe University, 3083, Bundoora, Victoria, Australia

    I. A. Staff

  2. School of Botany, University of Melbourne, 3052, Parkville, Victoria, Australia

    P. Taylor, J. Kenrick & R. B. Knox

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  1. I. A. Staff
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  3. J. Kenrick
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  4. R. B. Knox
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Staff, I.A., Taylor, P., Kenrick, J. et al. Ultrastructural analysis of plastids in angiosperm pollen tubes. Sexual Plant Reprod 2, 70–76 (1989). https://doi.org/10.1007/BF00191993

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