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pH staining of the starchy endosperm of wheat grains following germination. Wheat grains that were soaked for 3 d (A), 4 d (B), or 6 d (C) were longitudinally sectioned and stained with the pH indicator Bromcresol purple for 15 min. A yellow color corresponds to pH 5.2 or below and a brick red color corresponds to pH 6.8 or above. sc, Scutellum.
