, Volume 9, Issue 1, pp 505–513 | Cite as

The polarized stages in the meiosis of liliaceous plants

  • Tarvo Oksala
  • Eeva Therman


  1. 1.

    Observations have been made on the premeiotic, meiotic, and postmeiotic stages inEremurus himalaicus Baker. These include: the last premeiotic mitosis, leptotene, in which the chromosomes form a bundle, the zygotene bouquet, pachytene, the second contraction stage in diplotene, diakinesis, the first and second meiotic divisions, and the first pollen grain mitosis.

  2. 2.

    The working hypothesis is put forward that these stages are characteristic of plant meiosis in general.

  3. 3.

    The very rare occurrence of interlocking of bivalents and multivalents in plants with a high chiasma frequency and several pairing blocks is explained on the basis of the polarized bouquet stage during which the homologous chromosomes sort themselves out.

  4. 4.

    The relationship of the meiotic process to the mitotic cycle is discussed.



Meiotic Stage Pairing Block Meiotic Metaphase Meiotic Process Contraction Stage 
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Copyright information

© Springer-Verlag 1957

Authors and Affiliations

  • Tarvo Oksala
    • 1
    • 2
  • Eeva Therman
    • 1
  1. 1.Botanical Institute of the University of HelsinkiFinland
  2. 2.Institute of GeneticsHelsinkiFinland

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