13.3.6  Concluding remarks

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Interactions between high CO2 and other environmental variables on growth and photosynthetic attributes are obviously complex. Given that results presented here come from experiments where only one factor in addition to atmospheric CO2 was altered, extrapolation to field situations is problematic. Nevertheless, genetic variation in growth and yield response to high CO2 is considerable. Contrasts between species and even between cultivars in their sensitivity to high CO2 suggests that breeding varieties more responsive to high CO2 may be possible.