Abstract
THE earliest known physiological response brought about by phytochrome after absorption of red photons is a change in the electrical charge on cell surfaces that causes, in suitable conditions, a fapid attachment of root tips of barley and mung beans to glass charged with phosphates1–4. Far-red irradiation results in detachment of the root tips. I have shown previously that in the presence of greater than 10−8 M indoleacetic acid (IAA), mung bean root tips fail to attach following red irradiation3. This indicates that IAA is able to overcome the influence of phytochrome. I shall show here that in contrast to IAA, abscisic acid (ABA) at very low concentrations causes mung bean root tips to adhere to glass after successive red and far-red irradiation.
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References
Tanada, T., Proc. US Nat. Acad. Sci., 59, 376 (1968).
Jaffe, M. J., Science, 162, 1016 (1968).
Tanada, T., Plant Physiol., 43, 2070 (1968).
Yunghaus, H., and Jaffe, M. J., Physiol. Plant., 23, 1004 (1970).
Etherton, B., Plant Physiol., 45, 527 (1970).
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TANADA, T. Antagonism between Indoleacetic Acid and Abscisic Acid on a Rapid Phytochrome-mediated Process. Nature 236, 460–461 (1972). https://doi.org/10.1038/236460a0
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DOI: https://doi.org/10.1038/236460a0
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