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A. The time to 50% stomatal closure during photosynthetic relaxation (gs50 r) in three Oryza species and at two canopy levels. B. The time to 90% stomatal closure during photosynthetic relaxation (gs90 r) in three rice species and at two canopy levels. Letters are indicative of a significant difference between species. Six plants were measured per boxplot (n = 6)
