The arrangement of wall microfibrils on the inner surface of cortical cells in pea roots was observed by a replica method. In the elongating region, microfibrils were deposited transversely to the root axis. After cell elongation stopped, the orientation of microfibril deposition changed discontinuously from a transverse to an oblique one. The change occurred at 6–7 mm from the root tip. The oblique orientation seemed to change discontinuously to another oblique one as time passed.
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Taizo Hogetsu (1986) studied this question.