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Radish ( Raphanus sativus  cv. Giant White Globe) and lettuce ( Lactuca sativa  cv. Waldmann's Green) plants were grown for 25 days in growth chambers at 23 °C, ≈300 μmol·m- 2 ·s -1  PPF, and 18/6 photoperiod, and four CO 2  concentrations: 400, 1000, 5000, and 10,000 μmol·mol -1 . Average total dry mass (g/plant) at the 400, 1000, 5000 and 10,000 μmol·mol -1  treatments were 6.4, 7.2, 5.9, and 5.0 for radish and 4.2, 6.2, 6.6, and 4.0 for lettuce. Each species showed an expected increase in yield as CO 2  was elevated from 400 to 1000 μmol·mol -1 , but super-elevating the CO 2  to 10,000 μmol·mol -1  resulted in suboptimal growth. In addition, many radish leaves showed necrotic lesions at 10,000 μmol·mol -1  by 17 days and at 5000 μmol·mol -1  by 20 days. These results are consistent with preliminary tests in which radish cvs. Cherry Belle, Giant White Globe, and Early Scarlet Globe were grown for 16 days at 400, 1000, 5000, and 10,000 μmol·mol -1 . In that study, `Giant White Globe' produced the greatest total dry mass at 1000 (3.0 g/plant) and 5000 μmol·mol -1  (3.0 g/plant), and the least at 10,000 μmol·mol -1  (2.2 g/plant). `Early Scarlet Globe' followed a similar trend, but `Cherry Belle' showed little difference among CO 2  treatments. Results suggest that super-elevated CO 2  can depress growth of some species, and that sensitivities can vary among genotypes.

608 Super-elevated CO2 Concentrations Reduce Growth of Radish and Lettuce