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Light-saturated rates of photosynthesis (Pmax) expressed per unit leaf area (A) and per unit Chl (B) according to canopy position measured at ambient CO2 levels (350 μL L−1) for IR72 (white bars) and NPT variety IR65598-112-2 (black bars). Measurements were made at the FL, and the next three leaves (2L, 3L, and 4L). Means ± se, n = 5 to 10 (individual plants).
