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Pectin methylesterase (PME) activity in the root apex of two tatary buckwheat cultivars. Three-day-old seedlings were exposed to 0·5 mm CaCl2 solution (pH 4·5) containing 0 or 25 µm Al for 24 h. Root apices were excised for cell wall and PME extraction. PME activity was determined colorimetrically. Data are means ± s.d. (n = 3). Means with different letters are statistically different at P < 0·05.
