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SUMMARY

Planes of cell division have been investigated in the epidermis, cortex and stele, 400–1000 μm behind the cap apex, in lateral roots of Vicia faba, as they lengthened from just emerged to 4 cm. The frequency with which cells divided in any one plane differed in the various root tissues. Also, changes took place in the frequency with which the spindle was oriented in a radial, tangential or longitudinal plane in each tissue basally along these roots and as the laterals elongated. The contributions of cell division and cell expansion to increase in the dimensions of each tissue are discussed.