Differential of Spikelet Type in Avena in Relation to the Ploidy

  • I. Nishiyama
  • T. Morikawa
Part of the World Crops: Production, Utilization, Description book series (WCPU, volume 12)


The spikelet type of Avena is usually characterised by different combinations of two pairs of floret characters, hulled versus hull-less and separation versus non-separation. In the present study, four spikelet types were found in 20 Avena species and some induced polyploids, as follows:
  1. 1.

    Wild type (abb. W type): All hulled florets separate from their pedicels or one another when mature, as in A.fatua. Included 7 species.

  2. 2.

    Subwild type (S type): Spikelets separate from their pedicels but all hulled florets remain attached, as in A.sterilis. Included 5 species.

  3. 3.

    Cultivated type (C type): Spikelets and all hulled florets remian attached to their pedicels or each other, as in A.sativa. Included 3 species.

  4. 4.

    Naked type (N type): Spikelet and all hull-less florets remain attached. The spikelet is always multiflorous and the rachilla segment is elongated, as in A.nuda(6x) and A.nudibrevis(2x).



Plant Physiology Chromosome Pairing Osaka Prefecture Compound Gene Research Inst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Nishiyama I: Bull. Research Inst. Food Sci., Kyoto Univ. 4, 67–85, 1951.Google Scholar

Copyright information

© Martinus Nijhoff Publishers, Dordrecht 1986

Authors and Affiliations

  • I. Nishiyama
    • 1
  • T. Morikawa
    • 1
  1. 1.University of Osaka PrefectureOsakaJapan

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