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The relationships between leaf thickness (LT) and leaf density (LD, A), the surface area of mesophyll cells exposed to intercellular airspaces per leaf area (Sm, B), the surface area of chloroplasts exposed to intercellular airspaces per leaf area (Sc, C) across the eight rice genotypes. Data are means ± SD of three replicates. *P < 0.05; **P < 0.01; ***P < 0.001.
