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Mean and variation for flag leaf steady-state photosynthetic performance in six rice accessions. (A) Leaf CO2 assimilation (A), (B) stomatal conductance (gs), (C) intrinsic water use efficiency (iWUE=A/gs), and (D) intercellular CO2 concentration (Ci). Accessions are ordered by median performance. Letters are indicative of a significant difference between accessions.
