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Distribution of the duration of leaf expansion in the vertical plant profile. (A) Second-, (B) third- and (C) fourth-order axes during active seasonal growth and (D) second-, (E) third- and (F) fourth-order axes during reduced seasonal growth. The duration of leaf expansion was expressed in GDD (°Cd per leaf), and four treatments were considered: e[CO2] with irrigation, e[CO2] under rainfed conditions, a[CO2] with irrigation and a[CO2] under rainfed conditions.
