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This article in CS

  1. Vol. 31 No. 6, p. 1532-1535
     
    Received: Oct 22, 1990
    Published: Nov, 1991


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doi:10.2135/cropsci1991.0011183X003100060030x

Meiotic Stability of 56-Chromosome Tall Fescue Hybrid Derivatives

  1. G. C. Eizenga ,
  2. P. B. Burrus,
  3. J. F. Pedersen and
  4. P. L. Cornelius
  1. U SDA-ARS, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583.
    D ep. of Agronomy and Dep. of Statistics, Univ. of Kentucky, Lexington, KY 40546-0091

Abstract

Abstract

Tall fescue, Festuca arundinacea Schreb., has been hybridized with annual ryegrass, Lolium multiflorum Lam., and/or giant fescue, F. gigantea (L.) Vill., in order to incorporate the genes for higher digestibility, and improve the nutritive value of tall fescue. The objective of this study was to determine meiotic stability of the KY- 2N56 tall fescue germplasm at the octoploid level. The germplasm was selected from hybrid derivatives of annual ryegrass ✕ tall fescue and tall fescue ✕ giant fescue over two generations of restricted recurrent selection for 56-chromosome, fertile phenotypes. Meiotic configurations, micronuclei per dyad, micronuclei per quartet, stainable pollen, and seed yield were determined for the 8 parent, 7 firstgeneration, and 35 second-generation plants used in the development of the KY-2N56 germplasm. Univalents significantly increased and chain quadrivalents significantly decreased over generations. Chain quadrivalents differed among generations of certain parental families. The other meiotic configurations, micronuclei per dyad, micronuclei per quartet and stainable pollen did not differ. Seed yield (g panicle−1) showed significant linear and nonlinear effects of generations, and significant interactions for generations ✕ parental families. No significant correlations were found between seed yield and the other variables examined which suggested that seed set was more strongly influenced by other factors, most likely environmental. The KY-2N56 germplasm appeared meiotically stable although the frequency of univalents and multivalents was low.

Joint contribution from the USDA-ARS and the Kentucky Agric. Exp. Stn. Journal no. 90-5-211.

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