Field phenotyping of ten wheat cultivars under elevated CO₂ shows seasonal differences in chlorophyll fluorescence, plant height and vegetation indices.

The results showed no significant main effect of the CO 2 treatment (F(1, 538) = .49, p = .484), but a highly significant main effect of the three different growth periods (F(2, 538) = 364.89, p <.001) and a highly significant interaction effect between CO 2 and the growing period (F(2, 538) = 29.32, p <.001).

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The simple main effects analysis of F q '/F m ' did reveal a trend towards lower values under e[CO 2 ] with a marginally significant treatment effect (F(1, 171) = 3.71, p = .056) due to larger variance during this final growth stage.

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