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Reproduction in Bulbochaete hiloensis (Nordst.) Tiffany

II. Sexual reproduction

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Summary

  1. 1.

    Sexual reproduction in Bulbochaete hiloensis (Nordst.) Tiffany is mediated by the production of dwarf males and oogonia.

  2. 2.

    Mature dwarf males have a stipe cell and a variable number of antheridia, each divided by a septum separating two spermatozoids.

  3. 3.

    Each spermatozoid consists of a head and body surmounted by a flagellar apparatus with a ring of six to nine flagella.

  4. 4.

    The spermatozoid body is characterized by a large nucleus with chromatin but without an apparent nucleolus, and a highly reduced chloroplast with stroma starch but no pyrenoids.

  5. 5.

    Each spermatozoid is surrounded by a fibrous vesicle and an electron dense layer which are thought to be functional in the sequential release of the spermatozoids from the antheridium.

  6. 6.

    A vegetative photosynthetic cell undergoes division to eventually give rise to an oogonium and primary and secondary suffultory cells.

  7. 7.

    The suffultory cells have highly vacuolate, degenerate cytoplasm with no chloroplast.

  8. 8.

    Within the oogonium, the nucleus becomes located near an extracytoplasmic, fibrogranular mass of mucosubstances laid down in the vicinity of a partial wall discontinuity. These mucosubstances are possibly functional in splitting the wall to form the fertilization pore.

  9. 9.

    The plug progressively disperses as the oogonial cytoplasm rounds off, receding from the cell wall in the apical and basal regions.

  10. 10.

    Following fertilization the oogonial contents refill the enclosing cell wall. The nucleus returns to the centre of the cell and the cytoplasm becomes dominated by numerous closely-packed, lipid-like bodies. Stages in the development of the seven-layered oospore wall are described.

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Authors and Affiliations

  1. Electron Microscope Unit, Department of Botany, University of Manchester, England

    B. Retallack & R. D. Butler

  2. Department of Zoology, University of Manchester, England

    B. Retallack & R. D. Butler

Authors
  1. B. Retallack
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  2. R. D. Butler
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Retallack, B., Butler, R.D. Reproduction in Bulbochaete hiloensis (Nordst.) Tiffany. Archiv. Mikrobiol. 90, 343–364 (1973). https://doi.org/10.1007/BF00408929

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