Summary
Helminthosporol (H-ol) promoted the growth of light grown cucumber hypocotyls. The IAA-oxidase activity per dry weight of the hypocotyl of H-ol treated materials was less than that of controls. There was an inverse relationship between IAA-oxidase activity and H-ol induced elongation of the hypocotyl. However, when IAA-oxidase activity per plant was compared between H-ol treated materials and controls there was no essential difference. It is concluded that the apparent inhibitory effect of H-ol on IAA-oxidase activity is not directly related to the mechanism of H-ol action.
This is a preview of subscription content, log in via an institution to check access.
References
Briggs, D. E.: Gibberellin-like activity of helminthosporol and helminthosporic acid. Nature (Lond.) 210, 418–419 (1966).
Goldacre, P. L., A. W. Galston, and R. L. Weintrub: The effect of substituted phenols on the activity of the indoleacetic acid oxidase of peas. Arch. Biochem. 43, 358–373 (1953).
Gordon, S. A., and R. P. Weber: Colorimetric estimation of indoleacetic acid. Plant Physiol. 26, 192–195 (1951).
Halevy, A. H.: Interaction of growth-retarding compounds and gibberellin on indoleacetic acid oxidase and peroxidase of cucumber seedlings. Plant Physiol. 38, 731–737 (1963).
Kato, J., Y. Shiotani, S. Tamura, and A. Sakurai: A new plant growthpromoting substance: Helminthosporol. Naturwissenschaften 51, 341 (1964).
————: Physiological activities of helminthosporol in comparison with those of gibberellin and auxin. Planta (Berl.) 68, 353–359 (1966).
Katsumi, M., B. O. Phinney, and W. K. Purves: The roles of gibberellin and auxin in cucumber hypocotyl growth. Physiol. Plantarum (Kbh.) 18, 462–473 (1965).
Katsumi, M., J. Kato, and S. Tamura: Physiological activities of helminthosporol, a new plant growth regulator, in relation to its mode of action. abstracts of the papers presented at the U.S.-Japan Seminar on Plant Growth Regulation, Kyoto, Japan 1966, p. 27–29.
Momotani, Y., and J. Kato: Isozymes of α-amylase induced by gibberellic acid in embryoless endosperms of barley. Plant Physiol. (in press).
Mori, S., K. Kumazawa, and S. Mitsui: Stimulation of release of reducing sugars from the endosperms of rice seeds by helminthosporol. Plant & Cell Physiol. 6, 571–574 (1965).
See Paleg, L. G.: Physiological effects of gibberellins. Ann. Rev. Plant Physiol. 16, 291–382 (1965).
Tamura, S., A. Sakurai, K. Kainuma, and M. Takai: Isolation of helminthosporol as a natural plant growth regulator and its chemical structure. Agr. Biol. Chem. (Japan) 27, 738–739 (1963).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Katsumi, M., Tamura, S. & Sakurai, A. IAA-oxidase activity in light grown cucumber hypocotyls treated with helminthosporol. Planta 74, 97–100 (1967). https://doi.org/10.1007/BF00385174
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00385174