Gibberellins and geotropism in Zea mays coleoptiles.
Diffusible gibberellins were obtainable in agar from excised 4 mm tips of etiolated coleoptiles of Zea mays. Placing the tips in a horizontal position increased the total yield of gibberellins by approximately five times. With horizontal tips, the ratio of gibberellin activity recovered from lower and upper halves, expressed as a percentage of total yield, was 80.76:19.24 (lower:upper).
Department of Biology, The University of Calgary, T2N 1N4, Calgary, Alberta, Canada.
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Railton
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Phillips