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Empirical Selection of Cultivated Oat in Response to Rising Atmospheric Carbon Dioxide

^a USDA-ARS, Alternate Crop and Systems Lab., Beltsville, MD 20705
^b USDA-ARS, Rangeland Resource Research Unit, Cheyenne, WY 82001

View larger version (27K): [in this window] [in a new window]   Figure 1. The relative increase in oat (Avena sativa L.) tiller numbers at 49 d after sowing (DAS) for seven old and new cultivars (see Table 1) relative to the 300 µmol mol–1 CO2 concentration (e.g., a value of 2.0 indicates a doubling in tiller production). No effect of CO2 concentration on tiller production was observed for any oat lines released during the 1990s.

View larger version (38K): [in this window] [in a new window]   Figure 2. The relative increase in oat (Avena sativa L.) whole-plant biomass at 49 d after sowing (DAS) for seven old and new cultivars (see Table 1) relative to the 300 µmol mol–1 CO2 concentration (e.g., a value of 2.0 indicates a doubling in biomass).