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This article in AJ

  1. Vol. 105 No. 6, p. 1635-1644
    Received: June 03, 2013
    Published: September 6, 2013

    * Corresponding author(s): mauricio.ulloa@ars.usda.gov


Elite Upland Cotton Germplasm-Pool Assessment of Fusarium Wilt Resistance in California

  1. Robert B. Hutmachera,
  2. Mauricio Ulloa *b,
  3. Steven D. Wrightc,
  4. B. Todd Campbelld,
  5. Richard Percye,
  6. Ted Wallacef,
  7. Gerald Myersg,
  8. Fred Bourlandh,
  9. David Weaveri,
  10. Peng Cheej,
  11. Peggy Thaxtonk,
  12. Jinfa Zhangl,
  13. Wayne Smithm,
  14. Jane Devern,
  15. Vasu Kuraparthyo,
  16. Daryl Bowmano,
  17. Don Jonesp and
  18. John Burkeb
  1. a Dep. of Plant Science, Univ. of California-Davis, West Side Research and Extension Center, Five Points, CA 93624
    b USDA-ARS, Cropping Systems Research Lab., Plant Stress and Germplasm Development Unit, Lubbock, TX 79415
    c Univ. of California, Tulare, CA 93274
    d USDA-ARS, Coastal Plains Soil and Water Conservation Research Center, Florence, SC 29501
    e USDA-ARS, Southern Plains Agricultural Research Center, Crop Germplasm Unit, College Station, TX 77845
    f Mississippi State Univ., MS 39762
    g Agriculture Center, Louisiana State Univ., Baton Rouge, LA 70803
    h Northeast Research and Extension Center, Univ. of Arkansas, Keiser, AR 72351
    i Dep. of Agronomy and Soils, Auburn Univ., Auburn, AL 36849
    j Univ. of Georgia, National Environmentally Sound Production Agriculture Laboratory, Tifton, GA 31793
    k Delta Research and Extension Center, Stoneville, MS 38776
    l Dep. of Plant and Environmental Sciences, New Mexico State Univ., Las Cruces, NM 88003
    m Dep. Crop and Soil Sciences, Texas A&M Univ., College Station, TX 77843
    n Texas A&M AgriLife Research and Extension Center, Lubbock, TX 79403
    o Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695
    p Cotton Incorporated, Cary, NC 27513.


During the past 9 yr, a new race of Fusarium (Fusarium oxysporum f. sp. vasinfectum [FOV Race 4]) has increasingly impacted cotton (Gossypium spp.) in the San Joaquin Valley of California. To assess the vulnerability of upland cotton (G. hirsutum L.) in California to FOV disease, elite upland germplasm lines from 13 U.S. public breeding programs across the Cotton Belt and commercial cultivars were evaluated for disease resistance to FOV Races 1 and 4. Ten independent replicated field trials were conducted: three in 2008, four in 2010, and three in 2011. Significant differences (P 0.05) were observed for disease severity index of leaves, vascular root staining, and plant survival values among the elite germplasm lines in all 3 yr for the levels of resistance–response to FOV Races 1 and 4. Also, significant interactions among germplasm lines, FOV races (1 and 4), and evaluation sites indicated that germplasm lines differed in mechanisms of plant-defense response for the two FOV races. Selected lines from programs in the states of Alabama, Arkansas, Louisiana, and Mississippi showed at least a moderate level of tolerance to both FOV races; however, several of these lines produced weak and coarse fibers. Based on these evaluations, many of the entries in public breeders’ current elite upland germplasm pools may be more susceptible than expected to some FOV races, and sources of acceptable levels of resistance may be limited when tested under infestation levels that resulted in only 5 to 35% plant survival in susceptible check cultivars.

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Copyright © 2013. Copyright © 2013 by the American Society of Agronomy, Inc.