Sexual Plant Reproduction

, Volume 5, Issue 1, pp 72–78 | Cite as

Diplosporous embryo-sac formation and the degree of diplospory inAllium tuberosum

  • A. Kojima
  • Y. Nagato
Original Articles


To obtain information on the dynamic and quantitative aspects of displospory in a facultative apomict,Allium tuberosum (2n = 32), we cytologically observed the entire course of female meiosis and embryosac development in cv ‘Tender-Pole’ by the clearing-staining-squash method. A time-table of its course was constructed in terms of bud length and days pre-anthesis. Chromosome threads were observed in pairs at the earliest stage of meiosis, after which 32 autobivalents developed. Thus, endoreduplication must have occurred during premeiotic interphase or at the onset of female meiosis. Such endoreduplicational meiosis also occurred on the male side, though the frequency (3.9%) was much lower than that on the female side (80%). The degree of diplospory calculated as the percentage of reduplicated embryo-sac mother cells varied to some extent among six cultivars: ‘Huhehaote’ and ‘Manchuria’ showed the highest degree of diplospory (98%), and ‘Kaohsiung’ the lowest (76%).

Key words

Endoreduplication Female meiosis Embryo sac development Degree of diplospory Alliumtuberosum 


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • A. Kojima
    • 1
  • Y. Nagato
    • 1
  1. 1.Laboratory of Plant Breeding, Faculty of AgricultureTohoku UniversitySendaiJapan

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