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Aerenchyma formation in the root cross-section sampled at 4 cm from the root tips in wheat genotypes with different degrees of aerenchyma formation after waterlogging treatment. Upper panel: H-195; Bottom panel: H-242. (A, E), (B, F), (C, G), and (D, H): waterlogging for 1, 3, 5 and 7 days, respectively.
