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Free-Air CO₂ Enrichment and Drought Stress Effects on Grain Filling Rate and Duration in Spring Wheat

^a NEI/NIH, Bld. 6 Rm 304, 6 Center Dr., Bethesda, MD 20892-2740 USA
^b Weed Science Lab., USDA-ARS, Washington State Univ., Pullman, WA 99164 USA
^c Jr., Water Conservation Lab., USDA-ARS, 4331 E. Broadway Rd., Phoenix, AZ 85040 USA
^d Associate Professor of Plant Sciences, Univ. of Idaho, Idaho Agric. Exp. Stn. Res. Paper No. 97735. Dep. of Plant, Soil and Entomological Sciences, Univ. of Idaho, Moscow, ID 83844-2339 USA

View larger version (25K): [in a new window]   Fig. 1 The main stem spike total grain weight as a logistic function of accumulated thermal units over different CO2 and water regimes. Vertical error bars represent observed means ± standard errors. AD = ambient CO2 and dry treatment; AW = ambient CO2 and well-watered treatment; ED = elevated CO2 and dry treatment; EW = elevated CO2 and well-watered treatments

View larger version (30K): [in a new window]   Fig. 2 Logistic functions representing grain weights of upper, middle and lower sections of the main spike as a function of accumulated thermal units over dry treatment (left) and well-watered treatment (right). Vertical error bars represent predicted value ± standard errors. AD = ambient CO2 and dry treatment; AW = ambient CO2 and well-watered treatment; ED = elevated CO2 and dry treatment; EW = elevated CO2 and well-watered treatments

View larger version (28K): [in a new window]   Fig. 3 Logistic functions representing grain weights of the main stem and tillers as a function of accumulated thermal units. Vertical error bars represent predicted value ± standard errors. AD = ambient CO2 and dry treatment; AW = ambient CO2 and well-watered treatment; ED = elevated CO2 and dry treatment; EW = elevated CO2 and well-watered treatments