Photosynthetic rate and WUE are improved in AtEDT1/HDG11 transgenic plants in the field. A to D, Comparisons of photosynthetic rate (A), transpiration rate (B), stomatal conductance (C), and WUE (D) between the ZH11 control and the transgenic plants. Three measurements were carried out for each plant, and 10 plants were used for each line. Values are mean ± sd (*P < 0.05, **P < 0.01).