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Crop Science Abstract -

Cytological Examinations of Two Tall Fescue Genotypes and Their Sterile Hybrids1


This article in CS

  1. Vol. 23 No. 3, p. 485-487
    Received: Sept 28, 1981

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  1. P. R. Beuselinck,
  2. R. M. Vasquez,
  3. R. V. Frakes and
  4. D. O. Chilcote2



Hybrids between two fertile accessions of tall fescue, Festuca arundinacea Schreb., (PI 234906, from Switzerland, and PI 174209, from Turkey) were highly sterile, with indehiscent anthers and negligible seed set (<0.01%). Both parents and the hybrids had 2n = 6x = chromosomes, without gross karyotypic variation or appreciable meiotic irregularity. The parents differed in number of secondary constrictions (8 in P1174209 and 10 in P1234906), indicating potential for cryptic structural hybridity in the F1 hybrids. Although the frequency was low, the hybrids also had signficantly more univalents per cell than their parents (0.72 vs. 0.31 and 0.14). Since meiotic irregularities did not seem to account for the hybrid sterility, we believe it may be under genic, probably sporophytic, control.

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