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WHEAT

White Wheat Grain Quality Changes with Genotype, Nitrogen Fertilization, and Water Stress

^a Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331-3002
^b current address: CIMMYT, Km 45 Carretera Mexico-Veracruz, Texcoco, 56130 México
^c current address: USDA-ARS-RRVARC, Wheat Quality Lab., 214 Harris Hall, North Dakota State Univ., Fargo, ND 58105

^* Corresponding author (c.saintpierre{at}cgiar.org).

The production of hard white winter (HWW) wheats (Triticum aestivum L.) with acceptable protein content and quality over different environments requires the correct combination of genotypes and management practices. The objectives of this study were to evaluate moisture deficit and N management on grain protein and quality of seven HWW and two soft white winter (SWW) genotypes, and to identify genotypes and traits that minimize grain quality variability. Plots were irrigated during grain fill to replace from 100 to <30% of estimated evapotranspiration (ET). Biomass of three genotypes across the irrigation levels was used as an integrated estimation of plant water stress at late grain fill. Biomass reductions under water stress tended to be higher if plots received high N fertilization. Water stress reduced grain yield, test weight, and kernel weight and diameter. Reducing irrigation increased average grain protein content from 116.4 to 128.3 g kg^–1. Nitrogen treatment did not affect grain yield. Additional N increased grain protein content and hardness for all genotypes. Reductions in test weight, and grain weight and diameter were observed under high N fertilization. High N fertilization would increase the numbers of kernels and extend the grain-fill period, which result in greater water and heat stress. The SWW genotypes had greater reductions in test weight than HWW genotypes with increasing water stress. Among HWW genotypes, late maturing genotypes had larger reductions in test weight than early genotypes. In regions where late season water stress is common, early maturing genotypes are more likely to produce consistent grain quality.

Abbreviations: DW, dry weight • ET, evapotranspiration • FW, fresh weight • HI, hardness index • HWW, hard white winter wheat • SKCS, single kernel characterization system • SWW, soft white winter wheat • TW, test weight

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Received for publication May 17, 2007.