Abstract
EVIDENCE was recently obtained by one of us1 indicating that the influence coming down from the leaves, which activates cambial growth, is a hormone. Also Laibach2 has caused decapitated epicotyls of Vicia Faba and various leaf-stalks to grow in thickness by placing on them the pollinia of orchids, which he has shown to exude large quantities of auxin, the hormone which promotes the elongation of stems; but he has not stated what anatomical changes were involved. We have now been able to activate cambial growth in decapitated strips of young sunflower hypocotyls, by inserting the upper ends of the strips into a 0·02 per cent solution, in 25 per cent gelatine, of the ether-soluble component of urine, which is known to contain abundant auxin3. The gelatine containing the extract was applied in short pieces of glass tube while warm and liquid, and quickly set to a gel. It contained a little thymol (1 in 100,000), and was renewed every three days.
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References
Snow, R. New Phyt., 32, 288; 1933.
Laibach, F., Ber. Deutsch. bot. Ges., 51, 336; 1933.
Kögl, F., Haagen-Smit, A. J., and Erxleben, H., Z. physiol. Chem., 214, 241; 1933.
Snow, R., New Phyt., 31, 351; 1932.
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SNOW, R., FANU, B. Activation of Cambial Growth. Nature 135, 149 (1935). https://doi.org/10.1038/135149a0
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DOI: https://doi.org/10.1038/135149a0
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