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Agronomy Journal Abstract - Organic Agriculture & Agroecology

Genotype × Environment Interactions for Mineral Concentration in Grain of Organically Grown Spring Wheat


This article in AJ

  1. Vol. 103 No. 6, p. 1734-1741
    Received: Mar 28, 2011

    * Corresponding author(s): kmurphy2@wsu.edu
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  1. Kevin M. Murphy *a,
  2. Lori A. Hoaglandb,
  3. Lin Yanc,
  4. Micaela Colleyd and
  5. Stephen S. Jonese
  1. a Dep. of Crop and Soil Sciences, 291D Johnson Hall, Washington State Univ., Pullman, WA 99164-6420
    b Dep. of Horticulture and Landscape Architecture, Purdue Univ., 625 Agriculture Mall Dr., West Lafayette, IN 47907
    c USDA-ARS, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202
    d Organic Seed Alliance, P.O. Box 772, Port Townsend, WA 98368
    e Northwest Research and Extension Center, 16650 State Route 536, Washington State Univ., Mount Vernon, WA 98273


Genotype × environment (G×E) interactions for Ca, Cu, Fe, Mg, Mn, P, and Zn concentrations are not well understood, particularly in the context of organic farming systems. The objectives of this study were to: (i) investigate G×E interactions for mineral nutrient concentration in organically grown wheat; and, (ii) assess whether grain mineral concentration is a broadly or narrowly adapted trait when grown in contrasting environments over time. We evaluated 18 spring wheat (Triticum aestivum L.) cultivars on three organic farms in Washington State for mineral concentration and for grain yield in 2008 and 2009. The G×Year (Y) interactions were found for grain yield and all minerals except Fe, Mn, and P and G×Location (L) interactions were found for grain yield and all minerals except Fe. The G×E (G×L×Y) interactions were found for grain yield and all minerals except for Mn. Grain yield was not consistently correlated with mineral nutrients across years and locations. Among minerals, Mg:P, P:Zn, and Mg:Zn were positively correlated in at least five of six site-years, suggesting the potential for simultaneous selection of these minerals. Grain mineral concentrations of Cu, Fe, and P showed relatively broad adaptation across years when compared with Ca and Mg concentrations. Fewer cultivars were broadly adapted spatially than temporally for stable levels of mineral concentration. Several cultivars had relatively high concentrations of two or more minerals across locations, indicating the potential for farmer utilization of broadly adapted cultivars and varietal blends that will significantly increase grain mineral concentration.

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