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Crop Science Abstract -

Parentage Analysis of International Spring Wheat Yield Nurseries 17 to 27


This article in CS

  1. Vol. 38 No. 2, p. 337-341
    Received: Feb 14, 1997

    * Corresponding author(s): esouza@uidaho.edu
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  1. E. Souza ,
  2. P. N. Fox and
  3. B. Skovmand
  1. Dep. of Plant, Soils, and Entomological Science, Univ. of Idaho, Aberdeen Research and Extension Center, P.O. Box AA, Aberdeen, ID 83210



Breeders can increase genetic diversity by selecting lines with novel parentage from international nurseries. A database program, WCOP, an application of the International Center for Maize and Wheat Improvement (CIMMYT) Wheat Pedigree Management System (WPMS), calculated the coefficient of parentage (COP) among cultivars and was used to study 169 wheats from the International Spring Wheat Yield Nurseries (ISWYN) No. 17 to 27, and a set of 27 reference cultivars. The average COP (excluding similarity values of cultivars with themselves) among the 196 lines was 0.14. The similarity between the ISWYN cultivar group and the reference cuitivar group was 0.08. Average internal COP values for U.S.-Canadian, Australian, and ISWYN sets were 0.18, 0.30, and 0.14, respectively. The ISWYN cultivars were clustered by means of COP values into genealogically similar groups. The largest ISWYN clusters were divergent from U.S., Canadian, and Australian standard spring cultivars. The clusters highlight divergent germplasm that may broaden the genetic base of breeding programs in temperate zones.

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