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Rising Atmospheric Carbon Dioxide and Seed Yield of Soybean Genotypes

Climate Stress Laboratory, USDA-ARS, Bldg 046A, 10300 Baltimore Avenue, Beltsville, MD 20705

View larger version (15K): [in a new window]   Fig. 1. Variation in the ratio of seed yield (g plant-1) at elevated (71 Pa, E) to that at ambient (40 Pa, A) carbon dioxide for eight ancestral and one modern soybean cultivar over three runs of the experiment. To test for differences among cultivars in the responsiveness of seed yield to elevated CO2, the ratio of the mean value at elevated (E) to that at ambient CO2 (A) for a given experimental run was calculated. Variation among cultivars in this ratio was tested using one way ANOVA, with three replicates. The mean seed yield response of Mandarin was significantly (P = 0.05) higher than the other cultivars. Cultivars are listed alphabetically

View larger version (23K): [in a new window]   Fig. 2. The percentage stimulation of seed yield for nine soybean cultivars grown at elevated CO2 (71 Pa, E) relative to the ambient CO2 treatment (40 Pa, A) over three runs of the experiment. Cultivars are listed according to the relative response of seed yield to elevated CO2. * indicates a significant difference (P < 0.05) relative to ambient CO2 for individual cultivars. Bars are ±se

View larger version (17K): [in a new window]   Fig. 3. Change in the ratio of branch and main stem seed weight per plant at elevated (71 Pa, E) to that at ambient (40 Pa, A) carbon dioxide in relation to the increase in total seed yield for the entire plant. r2 was significant for the change in branch seed weight per plant. AR = Arksoy; CN = CNS; DU = Dunfield; HA = Harrow; MA = Manchu; MN = Mandarin; MU = Mukden; S = S-100; WI = Williams. Data are from Run 3. Each point is the average of five plants