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

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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.

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Authors and Affiliations

  1. Center of Vegetable Breeding, CNR, Portici, Italy

    C. Conicella

  2. Dept. of Agronomy Science and Plant Genetics, Univ. of Naples, Portici, Italy

    A. Barone, A. Del Giudice, L. Frusciante & L. M. Monti

Authors
  1. C. Conicella
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  2. A. Barone
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  3. A. Del Giudice
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  4. L. Frusciante
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  5. L. M. Monti
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Additional information

Communicated by F. Salamini

Contribution no. 53 from the Center of Vegetable Breeding, CNR, Portici, Italy

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Conicella, C., Barone, A., Del Giudice, A. et al. Cytological evidences of SDR-FDR mixture in the formation of 2n eggs in a potato diploid clone. Theoret. Appl. Genetics 81, 59–63 (1991). https://doi.org/10.1007/BF00226112

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  • DOI: https://doi.org/10.1007/BF00226112

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