Occurrence of SDR 2N-gametes in Lilium hybrids

K.B. Lim, T.M. Shen, R. Barba Gonzalez, M.S. Ramanna, J.M. van Tuyl

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The mechanism of SDR 2n-pollen formation was analyzed in two intra-sectional diploid (2n = 2x = 24) Lilium hybrids (Enchantment x L. pumilum). Variable frequencies of 2n-pollen were found. Meiotic analysis indicated that the intra-sectional hybrids showed perfect chromosome pairing in most cases at metaphase I and normal anaphase I movement of pollen mother cells (PMCs), but produced 2n-pollen by second division restitution (SDR). A high bivalent formation (11.9II and 11.8II, respectively) at metaphase 1, irregular meiotic division such as unbalanced chromosome separation and chromatic fragmentation resulted yet in acceptable pollen fertility for cross-pollination. The hybrids were fertile, and when used as male parents, offspring could tie generated. The significance of the occurrence of 2n-pollen for the breeding of lilies was analyzed.
Original languageEnglish
Pages (from-to)13-18
JournalBreeding Science
Issue number1
Publication statusPublished - 2004


  • interspecific hybrids
  • bc2 progenies
  • potato
  • mutants
  • desynapsis
  • fertility
  • crosses
  • pollen
  • gish

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    Lim, K. B., Shen, T. M., Barba Gonzalez, R., Ramanna, M. S., & van Tuyl, J. M. (2004). Occurrence of SDR 2N-gametes in Lilium hybrids. Breeding Science, 54(1), 13-18. https://doi.org/10.1270/jsbbs.54.13