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Cell wall fractionation yield (percentage extracted from alcohol-insoluble residue) of root segments from apex to 5 cm divided into 1-cm segments (S1–S5). Cell walls of each segment were subjected to sequential extraction with 490 mm sodium chlorite, 0·5 % ammonium oxalate, 0·1 m NaOH, 1 m NaOH and 4 m NaOH, and material remaining after fractionation was termed the residue (n = 5). Bars indicate standard error. Different letters indicate significant differences.
