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This article in CS

  1. Vol. 55 No. 1, p. 229-239
     
    Received: May 07, 2014
    Published: February 3, 2015


    * Corresponding author(s): pbaenziger1@unl.edu
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doi:10.2135/cropsci2014.05.0348

Characterization of Stem Rust Resistance in Wheat Cultivar Gage

  1. Tadele T. Kumssaa,
  2. P.S. Baenziger *a,
  3. M.N. Roused,
  4. M. Guttieria,
  5. I. Dweikata,
  6. G. Brown-Guedirae,
  7. S. Williamsone,
  8. R.A. Grayboschb,
  9. S.N. Weguloc,
  10. A.J. Lorenza and
  11. J. Polandfg
  1. a Dep. of Agronomy and Horticulture
    d USDA–ARS Cereal Disease Lab. and Dep. of Plant Pathology, Univ. of Minnesota, 1551 Lindig Street, St. Paul, MN 55108
    e USDA–ARS Eastern Regional Genotyping Lab., North Carolina State Univ., Raleigh, NC 27695-7620
    b USDA–ARS, 362G Plant Science Bldg
    c Dep. of Plant Pathology, Univ. of Nebraska, Lincoln, NE 68583
    f USDA–ARS, Hard Winter Wheat Genetics Research Unit, Kansas State Univ., 4008 Throckmorton Hall, Manhattan, KS 66506
    g current address, Dep. of Plant Pathology and Dep. of Agronomy, Kansas State Univ., Manhattan, KS

Abstract

Wheat (Triticum spp.) stem rust, caused by Puccinia graminis f. sp. tritici Eriks. and E. Henn. (Pgt), re-emerged as a devastating disease of wheat because of virulent race Ug99 (TTKSK). Many bread wheat (T. aestivum L.) cultivars grown in North America are susceptible to Ug99 or its derivative races that carry additional virulence. ‘Gage’ was released in 1963 mainly for its excellent field resistance to leaf rust (caused by Puccinia triticina Eriks) and stem rust. However, Gage’s resistance has not been genetically characterized, which would facilitate its use in breeding programs. To better define the nature of the resistance in Gage, we created an F2 population and the corresponding F2:3 and F4:5 families from crosses between Gage and stem rust susceptible cultivar ‘Bill Brown’. Inheritance of resistance to Pgt race QFCSC and molecular marker analysis indicated that Sr2 and additional genes explain the stem rust resistance of Gage. Using seedling plant infection types from the F2, F2:3, and F4:5 families, we found that at least one dominant and, most likely, one recessive gene are involved in Gage’s resistance. Seedling resistance genes acted independently of Sr2 since Sr2 is effective only at the adult plant stage.

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