Theoretical and Applied Genetics

, Volume 81, Issue 1, pp 59–63

Cytological evidences of SDR-FDR mixture in the formation of 2n eggs in a potato diploid clone

  • C. Conicella
  • A. Barone
  • A. Del Giudice
  • L. Frusciante
  • L. M. Monti
Originals

Summary

Macrosporogenesis and microsporogenesis were investigated in a diploid S. tuberosum x S. chacoense potato hybrid, characterized by more than 50% 2n egg formation. Fifty-five percent of dyad formation of 2n macrospores is ascribed to two meiotic abnormalities: omission of the second meiotic division, occurring at a frequency of 38%, and irregular spindle axis orientation at metaphase I at a frequency of 16%: These abnormalities give origin to a mixture of 2n eggs, composed of mostly second division restitution (SDR) and a small portion of first division restitution (FDR). Microsporogenesis showed rare dyads of 2n microspores depending on parallel spindles observed in anaphase II.

Key words

Macrosporogenesis 2n egg SDR FDR Potato 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • C. Conicella
    • 1
  • A. Barone
    • 2
  • A. Del Giudice
    • 2
  • L. Frusciante
    • 2
  • L. M. Monti
    • 2
  1. 1.Center of Vegetable Breeding, CNRPorticiItaly
  2. 2.Dept. of Agronomy Science and Plant GeneticsUniv. of NaplesPorticiItaly

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