Abstract
RECENTLY, Stewart, Bergren and Redemann1 and Stewart2 have extracted from the leafy cotyledons of radish seedlings a substance which retards the growth of oat coleoptiles. They extracted by a method devised by van Overbeek3 for extracting auxin, leaving the material in purified other without grinding it up, and then drying the extract by distillation and evaporation; and they tested the extract on decapitated coleoptiles by Went's method. Since it is an interesting question how widely growth inhibitors may be distributed in plants, I have made extracts from various parts of pea seedlings by the same method. The dried extracts were dissolved in a few drops of water, slightly acidified with hydrochloric acid, and the solutions, at about pH. 5.5, were tested by being taken up in little strips of blotting-paper, measuring 8 mm. × 2·5 mm., which were then applied to intact dark-grown oat coleoptiles, lengthwise along one of the narrow sides and reaching to the top. The strips stood on little ledges of vaseline placed to support them. As a rule the dried extract from each gram of fresh plant material, weighing about 11 mgm., was dissolved in one drop (50 cmm.) of water, and each drop of solution sufficed for three strips of paper and so for three coleoptiles.
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References
Stewart, W., Bergren, w., and Redemann, C. E., Science, N.S., 89, 185 (1939).
Stewart, W., Bot. Gaz., 101, 91 (1939).
Overbeek, J. van, Proc. Nat. Acad. Sci, 24, 42, (1938).
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SNOW, R. An Inhibitor of Growth Extracted from Pea Leaves. Nature 144, 906 (1939). https://doi.org/10.1038/144906a0
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DOI: https://doi.org/10.1038/144906a0
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