THE MODE OF GROWTH OF EPIDERMAL CELLS OF THE Avena Coleoptile

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Abstract
Sections 3 mm long from the upper third of 3 -day-old Avena coleoptiles were mounted on an uncovered slide in a drop of water containing 1% sucrose and 10 mg/1. indoleacetic acid. After light dusting with CuO powder, the spacings of specific particles were measured with a filar micrometer, or photographs were taken. By plotting the initial positions of 17 markers against their positions after 2.5 hrs. of growth, the points formed a straight line with a slope of 1.10. Observations of a series of CuO markers along a single epidermal cell indicated that the growth rate was uniform throughout the cell. No evidence was found to support the idea that the epidermal cells grew only at their tips.

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