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This article in CS

  1. Vol. 35 No. 5, p. 1306-1315
     
    Received: Nov 5, 1993


    * Corresponding author(s): ragotm@abru.cg.com
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doi:10.2135/cropsci1995.0011183X003500050009x

Molecular-Marker-Mediated Characterization of Favorable Exotic Alleles at Quantitative Trait Loci in Maize

  1. M. Ragot ,
  2. P. H. Sisco,
  3. D. A. Hoisington and
  4. C. W. Stuber
  1. C iba Seeds, CH-4002 Basel, Switzerland
    D ep. of Crop Science and USDA-ARS, North Carolina State Univ., Raleigh, NC 27695-7620
    C IMMYT, Apartado Postal 6-641, 06600 Mexico DF, Mexico
    D ep. of Genetics, Dep. of Crop Science and USDA-ARS, North State Univ., Raleigh, NC 27695-7614

Abstract

Abstract

Exotic maize (Zea mays L.) germplasm, shown to be useful for developing improved temperate cultivars, has remained little used partly because of many inherent shortcomings. Five F2 populations, developed from South American and U.S. germplasm, were used to detect favorable factors of exotic origin at quantitative trait loci (QTL) with isozymes and RFLPs. A number of traits of agronomic importance, including grain yield, were measured on F2 individuals and/or F3 families grown in several environments. Many QTLs, mostly with small effects, were identified. Major QTLs for grain yield and number of ears per plant were located on chromosomes 3 and 6. Stability of QTLs across environments was high. Favorable alleles of exotic origin were found at QTLs for several traits including grain yield and number of ears per plant. Most of these alleles also showed undesirable effects on other traits, however. Nevertheless, the superiority of exotic alleles over adapted alleles was demonstrated clearly at a few QTLs, re-affirming the usefulness of exotic germplasm for temperate maize breeding.

Part of a dissertation submitted by the senior author to the graduate school of the North Carolina State Univ. in partial fulfillment of the Ph.D degree.

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Copyright © 1995. Crop Science Society of America, Inc.Copyright © 1995 by the Crop Science Society of America, Inc.